Samacheer Kalvi Class 12 Computer Applications Solutions Chapter 11 Network Examples and Protocols

Part I

 

Question 1. The ........... "the Net,” is a worldwide system of computer networks.
(a) Internet
(b) mobile
(c) communication
(d) protocol
Answer: (a) Internet
In simple words: The Internet is a global system of computer networks that people all over the world use to share information. It is often called "the Net."

🎯 Exam Tip: Remember that the Internet is defined by its global reach and interconnection of many individual networks.

 

Question 2. Which one of the following will be easy the way to uses Internet technology and the public telecommunication system to securely share business's information with suppliers, vendors, partners and customers.
(a) Extranet
(b) Intranet
(c) arpanet
(d) arcnet
Answer: (a) Extranet
In simple words: An Extranet allows a company to share specific business information safely with people outside the company, like suppliers or customers, using internet technology.

🎯 Exam Tip: Distinguish between Intranet (internal only) and Extranet (internal + specific external partners) to answer such questions correctly.

 

Question 3. Match the following and choose the correct answer
i. HTTP -The core protocol of the World Wide Web.
ii. FTP – enables a client to send and receive complete files from a server.
iii. SMTP - Provide e-mail services.
iv. DNS- Refer to other host computers by using names rather than numbers.
(a) i, ii, iii, iv
(c) iii, iv, i, ii
Answer: (a) i, ii, iii, iv
In simple words: Each protocol listed matches its description directly. HTTP is for the web, FTP sends files, SMTP handles emails, and DNS converts names to numbers.

🎯 Exam Tip: For match-the-following questions, read each statement carefully to identify the primary function of each protocol before selecting the matching sequence.

 

Question 4. Communication over.................. is be made up of voice, data, images and text messages.
(a) Social media
(b) mobile network
(c) whatsapp
(d) software
Answer: (b) mobile network
In simple words: A mobile network handles all types of communication like talking, sending data, pictures, and text messages from our phones or other mobile devices.

🎯 Exam Tip: Remember that mobile networks are designed for diverse communication types to support modern mobile devices.

 

Question 5. Wi-Fi stands for.......
(a) Wireless Fidelity
(b) wired fidelity
(c) wired optic fibre
(d) wireless optic fibre
Answer: (a) Wireless Fidelity
In simple words: Wi-Fi is short for Wireless Fidelity, which is a technology that lets us connect to the internet or other devices without needing cables.

🎯 Exam Tip: Know the full forms of common acronyms in computer science, especially networking terms.

 

Question 6. A TCP/IP network with access restricted to members of an organization
(a) LAN
(b) MAN
(d) Intranet
Answer: (d) Intranet
In simple words: An Intranet is like a private internet for one organization, where only its members can access its network and information.

🎯 Exam Tip: Clearly differentiate between Intranet (private to an organization) and the global Internet (public access).

 

Question 7. RFID stands for
(a) Radio Free identification
(b) real Frequency identity
(c) Radio Frequency indicators
(d) Radio Frequency Identification.
Answer: (d) Radio Frequency Identification.
In simple words: RFID means Radio Frequency Identification, which is a way to identify things using radio waves, often seen in tracking products.

🎯 Exam Tip: Always learn the full forms for technical abbreviations to avoid confusion in multiple-choice questions.

 

Question 8. If guarantees the sending of data is successful and which checks error on operation at OSI layer is...
(a) Application layer
(b) Network layer
(c) Transport Layer
(d) Physical layer
Answer: (c) Transport Layer
In simple words: The Transport Layer in the OSI model makes sure that data is sent successfully from one place to another and checks for any errors during this process.

🎯 Exam Tip: Associate the Transport Layer with reliability, flow control, and error checking for data transmission in the OSI model.

 

Question 9. Which one of the following will secure data on transmissions?
(a) HTTPS
(b) HTTP
(c) FTP
Answer: (a) HTTPS
In simple words: HTTPS is the secure version of HTTP. It adds a layer of encryption to protect your data when it's sent over the internet, like when you shop online.

🎯 Exam Tip: Understand that the 'S' in HTTPS stands for 'Secure', indicating encrypted and protected communication.

 

Question 10. .................... provides e-mail service
(a) DNS
(b) TCP
(c) FTP
(d) SMTP
Answer: (d) SMTP
In simple words: SMTP, or Simple Mail Transfer Protocol, is the standard protocol used for sending and receiving emails across networks.

🎯 Exam Tip: Remember SMTP as the key protocol specifically designed for email transmission.

 

Question 11. .................... refer to other host computers by using names rather than numbers.
(a) DNS
(b) TCP
(c) FTP
(d) SMTP
Answer: (a) DNS
In simple words: DNS, or Domain Name System, is like a phonebook for the internet, translating easy-to-remember website names into numerical IP addresses that computers use.

🎯 Exam Tip: The primary role of DNS is to resolve domain names into IP addresses, which is crucial for internet navigation.

 

Question 12. TCP/IP is a combination of two protocols:
i. Transmission Control Protocol (TCP)
ii. Internet Protocol (IP)
iii. Selection Protocol (SP)
iv. Captial Protocol (CP)
(b) I, III
Answer: (a) i, ii
In simple words: The TCP/IP model is made up of two main parts: Transmission Control Protocol (TCP) and Internet Protocol (IP), which work together for network communication.

🎯 Exam Tip: Know that TCP/IP is a foundational suite of protocols, with TCP and IP being its core components responsible for connection and addressing.

 

Part II

Short Answers

 

Question 1. Define Intranet
Answer: An Intranet is a private network that an organization uses only for its own employees. It helps them share company information and computer resources securely. It often consists of many local area networks linked together.
In simple words: An Intranet is a private network inside a company that only its staff can use to share data and computing tools.

🎯 Exam Tip: Emphasize that an Intranet is private, for internal use only, and shares data/resources within an enterprise.

 

Question 2. What are the uses of mobile networks?
Answer: Mobile networks have several important uses:

• They allow connection to a network without needing physical cables.
• They consume less power compared to other communication methods.
• They can cover a large area more efficiently than a single, powerful transmitter.
• Mobile networks are crucial for connecting people and devices on the go.

In simple words: Mobile networks let us connect wirelessly, use less power, cover big areas, and help us communicate while moving around.

🎯 Exam Tip: When listing uses, focus on key benefits like wireless connectivity, power efficiency, and wide coverage for mobile communication.

 

Question 3. List out the benefits of WiFi
Answer: Here are the benefits of Wi-Fi:
1. It gives us mobility, letting us connect from different places within a network's range.
2. It offers a connection to the Internet wirelessly.
3. It provides flexibility, similar to a Local Area Network (LAN), but without wires.
4. It ensures easy connectivity for various devices.
5. Wi-Fi allows even remote locations to benefit from network access.
6. It often has a low cost with high benefits, making it widely used.
In simple words: Wi-Fi lets you move around and still connect to the internet easily, offering flexibility, wide access, and good value for money.

🎯 Exam Tip: Highlight mobility, internet access, flexibility, and cost-effectiveness as primary benefits of Wi-Fi.

 

Question 4. How many types of RFID system available and what are they?
Answer: There are two main types of RFID systems:
1. Active RFID systems: In these systems, the RFID tag has its own power source, like a battery, to power its circuits and transmit signals. This allows them to have a longer read range and memory capacity.
2. Passive RFID systems: These tags do not have their own power source. Instead, they get power from the radio waves sent out by the RFID reader's antenna. This power allows the tag to send back its data.
In simple words: There are two kinds of RFID systems: Active tags have their own battery, while Passive tags get power from the reader's signal.

🎯 Exam Tip: Remember the key difference between active and passive RFID: active tags have an internal power source, while passive tags draw power from the reader.

 

Question 5. Expand HTTP, HTTPS, FTP
Answer: Here are the full forms for the given acronyms:
1. HTTP – Hypertext Transfer Protocol (This is the basic protocol used for transferring data on the World Wide Web.)
2. HTTPS – Hypertext Transfer Protocol Secure (This is a secure version of HTTP that uses encryption to protect data.)
3. FTP - File Transfer Protocol (This protocol is used to transfer files between computers on a network.)
In simple words: HTTP helps transfer web pages, HTTPS does the same but securely, and FTP is used for sending files between computers.

🎯 Exam Tip: Know the full forms and basic functions of these common internet protocols, especially the 'S' in HTTPS for security.

 

Part III

Explain in brief answer

 

Question 1. Compare Internet, Intranet, and Extranet
Answer:

The Internet is a vast public network connecting billions globally, used for activities like email and web browsing. An Intranet is a private network within an organization, only accessible by its employees to share company data securely. An Extranet extends this private network to allow secure, limited access to outside partners, vendors, or customers, facilitating business collaboration. Each serves a different purpose for information sharing and access.
In simple words: The Internet is for everyone, Intranet is only for a company's staff, and Extranet is for a company to share specific information securely with a few outside partners.

🎯 Exam Tip: Focus on the access level (public, internal, limited external) to differentiate between Internet, Intranet, and Extranet.

 

Question 2. Discuss OSI model with its layers.
Answer: The Open Systems Interconnection (OSI) model was created in 1984. It is a general framework that helps develop network protocols, software, and systems based on a common set of guidelines. This model describes the standards for how computers communicate with each other.

OSI Layers:
1. Physical Layer: This is the first layer. It defines the electrical and physical rules for how devices connect, like what type of cables or connectors to use.
2. Data Link Layer: This is the second layer. It makes sure that data transmitted across a network segment is free of errors. It also handles how devices on a network share access to the physical medium.
3. Network Layer: This is the third layer. It is used to decide the best path for data packets to travel across different networks. It handles routing data packets using IP Addressing.
4. Transport Layer: This is the fourth layer. It guarantees that data is successfully sent and received. It includes error checking to ensure data integrity during transmission.
5. Session Layer: This is the fifth layer. It helps set up, manage, and end communication sessions between different network applications. For example, when you access a remote system, a session is created.
6. Presentation Layer: This is the sixth layer. It handles the translation of data into a format that the Application Layer can understand. It also deals with encryption and decryption, using protocols like Secure Socket Layer (SSL) to secure data.
7. Application Layer: This is the seventh and final layer. It acts as the user interface, providing software applications with network services. This layer is what users interact with directly, like web browsers or email clients.
In simple words: The OSI model is a 7-layer guide showing how computers talk to each other. Each layer, from Physical to Application, has specific jobs like handling cables, checking for errors, finding paths, and letting apps connect.

🎯 Exam Tip: To score well, name all seven layers in order and briefly explain the main function of each layer, focusing on its specific role in data communication.

 

Question 3. Difference between TCP/IP and OSI Reference Model.
Answer:

The TCP/IP model is a widely used networking model with four layers, developed by the U.S. Department of Defense. It is a practical client-server model for internet data transmission. In contrast, the OSI model is a seven-layer theoretical model, developed by the ISO, designed to describe how different network devices communicate. While OSI provides a comprehensive conceptual framework, TCP/IP is the practical standard for most internet communication today.
In simple words: TCP/IP is a 4-layer model used a lot for the internet, while the OSI model is a 7-layer guide to understand how networks work, but it's not used as much in real life.

🎯 Exam Tip: Remember the core differences: TCP/IP is practical with fewer layers, while OSI is theoretical with more layers, and know their originators.

 

Question 4. Explain the development, merits, and demerits of Mobile networks.
Answer: Mobile networks have evolved significantly, offering various advantages and disadvantages.

Merits of Mobile Networks:
1. Higher efficiency in communication and data transfer.
2. Increased ability to communicate both inside and outside the workplace.
3. Greater access to modern applications and services.
4. Improved networking capabilities, allowing better connections.
5. Enhanced quality and flexibility of services for users.
6. Rapid developments in cloud technologies, integrating mobile networks with cloud services.

Demerits of Mobile Networks:
1. Higher costs associated with infrastructure and service.
2. Vulnerability to security risks, such as data breaches.
3. Additional training is often needed for users to adapt to new technologies.
4. Risk of cybercrime due to increased connectivity.

Development:
The generations of mobile networks have developed as follows, each bringing new improvements:
1. First Generation (1G) 1981 – NMT Launch: This was the very first step in mobile communication. During this initial phase, mobile systems used analog transmission. This meant that the voice quality was very poor. Analog signals are continuous and can be easily affected by noise.

🎯 Exam Tip: When discussing mobile networks, ensure you cover both the advantages (efficiency, connectivity) and disadvantages (cost, security), and trace the evolution through generations with key features.

12th Computer Applications Guide Network Examples And Protocols Additional Important Questions And Answers

Part A

Choose The Correct Answers:

 

Question 1. Internet Protocol delivers packets from source to destination through
(a) TCP
(b) datagram
(c) packets header
(d) HTTP
Answer: (c) packets header
In simple words: The Internet Protocol (IP) works by sending data in small blocks called packets. These packets are like small packages that travel from where they start to where they need to go.

🎯 Exam Tip: Remember that IP focuses on addressing and routing packets, making the "packets header" the most direct answer for how it delivers data.

 

Question 2. ........... over the mobile network is being made up of voice, data, images, and text messages,
(a) Internet
(b) Intranet
(c) Extranet
(d) Communication
Answer: (d) Communication
In simple words: When we talk, send messages, or share pictures using a mobile phone, we are doing communication over the mobile network. It's how we exchange information with others.

🎯 Exam Tip: Communication is the overall term for exchanging information, which includes all the listed types of media like voice, data, images, and text.

 

Question 3. IP connectionless datagram service was developed by
(i) Vint Cerf
(ii) Bob F rton
(iii) Bob Kahnin
(iv) Dan Bricklin
(a) i, ii
(b) ii, iii
(c) ii, iv
(d) i, iii
Answer: (d) i, iii
In simple words: The Internet Protocol, which sends data in separate packets without needing a continuous connection, was created by Vint Cerf and Bob Kahn. These two people played a big role in building the internet.

🎯 Exam Tip: Knowledge of key figures in computer science history can sometimes help answer questions about technology development. Remember Cerf and Kahn for IP.

 

Question 4. The second generation of the mobile system was based on ........... transmission.
(a) Digital
(b) Analog
(c) Both (a) and (b)
(d) None of the options
Answer: (a) Digital
In simple words: The second generation (2G) of mobile phones used digital signals to send information. This was an upgrade from the older analog systems and made calls clearer.

🎯 Exam Tip: Differentiate between the "analog" nature of 1G and the "digital" nature of 2G mobile networks.

 

Question 5. Which protocols have to do the end-to-end process of secure on time and manage data or communications?
(a) Physical
(b) TCP
(c) Network
(d) ARPC
Answer: (c) Network
In simple words: Network protocols are rules that help different devices talk to each other safely and reliably. They make sure data gets from one end to the other, like a set of instructions for mailing letters.

🎯 Exam Tip: Recognize that "secure on-time and manage data" points to the fundamental role of network protocols in overall communication, not a single layer or specific protocol like TCP (which is a transport layer protocol).

 

Question 6. The RFID tag gets power from the reader through the ........... Method.
(a) Direct
(b) propagation
(c) Inductive Coupling
(d) Indirect
Answer: (c) Inductive Coupling
In simple words: RFID tags that don't have their own battery get power from the RFID reader using a method called inductive coupling. It's like how electricity can jump between two coils of wire when they are close.

🎯 Exam Tip: When answering about RFID, remember the mechanism of power transfer for passive tags, which relies on electromagnetic induction.

 

Question 7. A passive RFID system using ........... Method.
(a) EM wave Propagation
(b) Direct
(c) Inductive Coupling
(d) Indirect
Answer: (a) EM wave Propagation
In simple words: Passive RFID systems use electromagnetic waves to communicate. These waves carry energy to the tag, which then reflects them back to the reader with its information.

🎯 Exam Tip: For passive RFID, distinguish between the power transfer method (inductive coupling for close range) and the communication method (EM wave propagation).

 

Question 8. Find the wrongly matched pair.
(a) Network Communication Protocol - HTTP, TCP/IP
(b) Network Security Protocol - ICMP
(c) Network Management Protocol - SNMP
Answer: (b) Network Security Protocol - ICMP
In simple words: ICMP (Internet Control Message Protocol) is mainly used for sending error messages about network problems, not for securing data. So, linking ICMP to "Network Security Protocol" is incorrect.

🎯 Exam Tip: Understand the primary function of common network protocols. ICMP's role is diagnostic (error reporting), not security. Security protocols usually involve encryption and authentication.

 

Question 9. ........... mainly deals with financial transactions or transfer User personal data were highly sensitive.
(a) HTTP
(b) SMTP
(c) HTTPS
(d) FTTP
Answer: (c) HTTPS
In simple words: HTTPS is a secure version of HTTP. It uses encryption to protect sensitive data like credit card numbers or personal details when you are online, making sure no one else can easily see it.

🎯 Exam Tip: Always look for the "S" in HTTPS to indicate secure communication, essential for sensitive data like financial transactions.

 

Question 10. The ........... is one of the services interconnected over the Internet.
(a) Web
(b) TCP
(c) IP
(d) SMTP
Answer: (a) Web
In simple words: The World Wide Web, or simply "the web," is a big part of the internet that lets us access websites and information. It's like a huge library of connected documents and media that uses the internet's infrastructure to work.

🎯 Exam Tip: Understand that the Internet is the physical network infrastructure, while the Web is a service (like email or file transfer) that uses the Internet.

Abbreviations

1. ARPA - Advanced Research Projects Agency

2. NMT - Nordic Mobile Telephone Communication

3. GSM - Global System For Mobile Communication

4. SIM - Subscriber Identity Module

5. TMDA - Time Division Multiple Access

6. CDMA - Code Division Multiple Access

7. GPRS - General Packet Radio Service

8. EDGE - Enhanced Data Rates for Global Evolution

9. Li Fi - Light Fidelity

10. UMTS - Universal Mobile Telecommunication System

11. WCDMA - Wideband Code Division Multiple Access

12. ATM - Asynchronous Transfer Mode

13. MPLS - Multiprotocol Label Switching

14. ITU - International Telecommunication Union

15. RFID - Radio Frequency Identification

16. FTP - File Transfer Protocol

17. HTTP - HyperText Transfer Protocol

18. SMTP - Simple Mail Transfer Protocol

19. ARP - Address Resolution Protocol

20. ICMP - Internet Control Message Protocol

Assertion And Reason

 

Question 1. Assertion (A): Internet Protocol (IP) is the principle of the communications protocol. Reason (R): IP is referred to as TCP/IP Transmission Control Protocol/Internet Protocol.
(a) Both (A) and (R) are correct and (R) is the correct explanation of (A)
(b) Both (A) and (R) are correct, but (R) is not the correct explanation of (A)
(c) (A) is true and (R) is false
(d) (A) is false and (R) is true
Answer: (a) Both (A) and (R) are correct and (R) is the correct explanation of (A)
In simple words: Assertion (A) is true because IP is a main rule for how data is sent online. Reason (R) is also true because IP is often linked with TCP, together making up the TCP/IP suite, which explains Assertion (A)'s role.

🎯 Exam Tip: For assertion-reason questions, first check if each statement is individually true. Then, determine if the reason actually explains the assertion.

 

Question 2. Assertion (A): Network protocols Manages Data. Reason (R): Network protocols do not manage the network communication.
(a) Both (A) and (R) are correct and (R) is the correct explanation of (A)
(b) Both (A) and (R) are correct, but (R) is not the correct explanation of (A)
(c) (A) is true and (R) is false
(d) (A) is false and (R) is true
Answer: (c) (A) is true and (R) is false
In simple words: Assertion (A) is correct because network protocols are indeed used to manage data flow. Reason (R) is false because protocols are specifically designed to manage network communication, not the other way around.

🎯 Exam Tip: Network protocols define the rules for communication, which inherently involves managing how data is sent and received. A false reason often contradicts the basic definition of the subject.

 

Question 3. Assertion (A): Network communication protocols are that Basic data communication. Reason (R): Network communication protocols which specific as SMTP
(a) Both (A) and (R) are correct and (R) is the correct explanation of (A)
(b) Both (A) and (R) are correct, but (R) is not the correct explanation of (A)
(c) (A) is true and (R) is false
(d) (A) is false and (R) is true
Answer: (c) (A) is true and (R) is false
In simple words: Assertion (A) is true because network protocols are the basic rules for how data talks. Reason (R) is false because while SMTP is a protocol, it's specific for email and doesn't define all basic data communication.

🎯 Exam Tip: While SMTP is a network communication protocol, it's specialized. The reason would be correct if it stated that SMTP is *an example* of a network protocol, but not if it implies SMTP defines *all* basic data communication.

 

Question 4. Assertion (A): Advanced Research Projects Agency (ARPA) of the U.S. government in 1969 and was first recognized as the ARPANet. Reason (R): The Internet is a network of global connections – comprising private, public, business, academic, and government networks.
(a) Both (A) and (R) are correct and (R) is the correct explanation of (A)
(b) Both (A) and (R) are correct, but (R) is not the correct explanation of (A)
(c) (A) is true and (R) is false
(d) (A) is false and (R) is true
Answer: (b) Both (A) and (R) are correct, but (R) is not the correct explanation of (A)
In simple words: Both statements are true. ARPA created ARPANet, an early version of the internet. The internet today is a vast global network. However, the definition of the internet (R) does not explain *why* ARPA founded ARPANet (A).

🎯 Exam Tip: Even if both statements are true, the reason must logically explain *why* the assertion is true to be considered a "correct explanation."

 

Question 5. Assertion (A): The Internet is a global network, public TCP/IP network used by over a billion people all over the world Reason (R): An example of the internet is that Sending an email to a friend
(a) Both (A) and (R) are correct and (R) is the correct explanation of (A)
(b) Both (A) and (R) are correct, but (R) is not the correct explanation of (A)
(c) (A) is true and (R) is false
(d) (A) is false and (R) is true
Answer: (a) Both (A) and (R) are correct and (R) is the correct explanation of (A)
In simple words: Assertion (A) is true because the internet is a huge worldwide network that many people use. Reason (R) is also true because sending an email is a common way people use the internet, which helps explain the internet's purpose.

🎯 Exam Tip: A good explanation often provides a real-world application or consequence of the assertion. Sending an email is a direct use case for the internet's global connectivity.

 

Question 6. Assertion (A): [Assertion text missing in source] Reason (R): An example of Intranet is that Checking the availability of inventory from an outside supplier.
(a) Both (A) and (R) are correct and (R) is the correct explanation of (A)
(b) Both (A) and (R) are correct, but (R) is not the correct explanation of (A)
(c) (A) is true and (R) is false
(d) (A) is false and (R) is true
Answer: (c) (A) is true and (R) is false
In simple words: An Intranet is a private network for people *inside* an organization. Checking inventory with an *outside supplier* would be an Extranet function, not an Intranet. Therefore, Reason (R) is false.

🎯 Exam Tip: Clearly distinguish between Intranet (internal only) and Extranet (internal + specific external partners) to correctly evaluate statements about their uses.

 

Question 7. Assertion (A): NMT stands for Nordic Mobile Telephone communication Reason (R): NMT had a very low traffic density of one call per radio channel and a very poor voice quality.
(a) Both (A) and (R) are correct and (R) is the correct explanation of (A)
(b) Both (A) and (R) are correct, but (R) is not the correct explanation of (A)
(c) (A) is true and (R) is false
(d) (A) is false and (R) is true
Answer: (a) Both (A) and (R) are correct and (R) is the correct explanation of (A)
In simple words: Both statements are true. NMT means Nordic Mobile Telephone communication, and it was known for not handling many calls at once and having bad sound quality. The reason explains a key characteristic of NMT.

🎯 Exam Tip: The reason effectively explains *why* NMT was limited or primitive, directly supporting the assertion about what NMT was.

 

Question 8. Assertion (A): RFID - Radio Frequency Identification. Reason (R): RFID uses RF wireless technology to identify.
(a) Both (A) and (R) are correct and (R) is the correct explanation of (A)
(b) Both (A) and (R) are correct, but (R) is not the correct explanation of (A)
(c) (A) is true and (R) is false
(d) (A) is false and (R) is true
Answer: (a) Both (A) and (R) are correct and (R) is the correct explanation of (A)
In simple words: Assertion (A) correctly states what RFID stands for. Reason (R) is also correct because RFID works by using radio waves to identify things wirelessly. This reason explains how RFID (A) functions.

🎯 Exam Tip: The reason provides the fundamental working principle behind the technology named in the assertion, making it a direct explanation.

 

Question 9. Assertion (A): Physical Layer defines the electrical and physical specifications for devices. Reason (R) Physical layer has simple protocols like “802.3 for Ethernet” and "802.11 for WiFi”.
(a) Both (A) and (R) are correct and (R) is the correct explanation of (A)
(b) Both (A) and (R) are correct, but (R) is not the correct explanation of (A)
(c) (A) is true and (R) is false
(d) (A) is false and (R) is true
Answer: (c) (A) is true and (R) is false
In simple words: Assertion (A) is true because the Physical Layer handles the basic electrical and physical setup of network devices. However, Reason (R) is false because protocols like 802.3 (Ethernet) and 802.11 (Wi-Fi) belong to the Data Link Layer, not the Physical Layer.

🎯 Exam Tip: Remember the OSI model layers. The Physical Layer deals with raw bit transmission, while the Data Link Layer handles frame creation and local network protocols like Ethernet and Wi-Fi.

 

Question 10. Assertion (A): Network Layer is the 3rd layer determining the path of the data Packets. Reason (R): Network Layer helps in routing of data, packets is found using IP Addressing
(a) Both (A) and (R) are correct and (R) is the correct explanation of (A)
(b) Both (A) and (R) are correct, but (R) is not the correct explanation of (A)
(c) (A) is true and (R) is false
(d) (A) is false and (R) is true
Answer: (a) Both (A) and (R) are correct and (R) is the correct explanation of (A)
In simple words: Both statements are true. The Network Layer is the third layer in the OSI model and is responsible for finding the best path for data packets. This is exactly what IP addressing does by guiding packets through different networks.

🎯 Exam Tip: The core function of the Network Layer is routing, and IP addressing is the primary mechanism it uses to achieve this, thus the reason explains the assertion.

 

Question 11. Assertion (A): TCP/IP is a set of protocols that governs communications among all computers on the Internet Reason (R): TCP/IP protocol tells how informa-tion should be packaged, sent, and received, as well as how to get to its destination.
(a) Both (A) and (R) are correct and (R) is the correct explanation of (A)
(b) Both (A) and (R) are correct, but (R) is not the correct explanation of (A)
(c) (A) is true and (R) is false
(d) (A) is false and (R) is true
Answer: (a) Both (A) and (R) are correct and (R) is the correct explanation of (A)
In simple words: Both Assertion (A) and Reason (R) are true. TCP/IP is the main set of rules for internet communication, and Reason (R) explains exactly how these rules work by describing the packaging and delivery of information.

🎯 Exam Tip: The reason clearly defines the operational role of TCP/IP, which is to manage the entire process of data transfer over the internet, thereby explaining its governance function mentioned in the assertion.

 

Question 12. Assertion (A): Routable protocol which uses IP addresses to deliver packets Reason (R): It is a reliable protocol and guarantees the delivery of information
(a) Both (A) and (R) are correct and (R) is the correct explanation of (A)
(b) Both (A) and (R) are correct, but (R) is not the correct explanation of (A)
(c) (A) is true and (R) is false
(d) (A) is false and (R) is true
Answer: (c) (A) is true and (R) is false
In simple words: Assertion (A) is true because IP (Internet Protocol) uses addresses to send data packets. Reason (R) is false because IP is an unreliable protocol, meaning it doesn't guarantee delivery on its own. TCP is the reliable part of TCP/IP.

🎯 Exam Tip: Remember that IP is a "best-effort" or unreliable protocol. It tries to deliver packets but doesn't guarantee success or order. Reliability is handled by higher-layer protocols like TCP.

Find The Odd One On The Following

 

Question 1.
(a) Routers
(b) Servers
(c) Computers
(d) URLs
Answer: (d) URLs
In simple words: Routers, servers, and computers are all physical hardware devices or types of machines. URLs (Uniform Resource Locators) are addresses used to find web pages, not physical devices.

🎯 Exam Tip: Categorize the given options: if some are physical components and one is a logical identifier or concept, that's often the odd one out.

 

Question 2.
(a) HTTP
(b) TCP/IP
(c) CETD
(d) SSL
Answer: (b) TCP/IP
In simple words: HTTP and SSL are specific protocols or technologies (Hypertext Transfer Protocol, Secure Sockets Layer). TCP/IP is a full suite (collection) of protocols. "CETD" is not a standard protocol, making it the odd one for a different reason, but TCP/IP is the broader category. If CETD is considered an error, then TCP/IP is the most comprehensive *suite* versus specific *protocols*.

🎯 Exam Tip: Look for the overarching category. TCP/IP is a foundational suite of protocols, whereas HTTP and SSL are individual protocols or security layers that operate within that framework. "CETD" appears to be a typo or non-standard term.

 

Question 3.
(a) Suppliers
(b) Vendors
(c) Customers
(d) Employee
Answer: (d) Employee
In simple words: Suppliers, vendors, and customers are all external parties to an organization. An employee, on the other hand, is an internal member of the organization.

🎯 Exam Tip: Identify the common group (external entities) and the outlier (internal entity) to find the odd one out.

 

Question 4.
(a) Social Media
(b) E-mail
(c) Chatting
(d) Claims
Answer: (d) Claims
In simple words: Social media, e-mail, and chatting are all forms of communication. "Claims" refers to assertions or demands, which is a different concept not directly related to communication methods.

🎯 Exam Tip: Group the options by their fundamental function or purpose. Communication methods form one group; "claims" does not fit.

 

Question 5.
(a) Voice
(b) Video
(c) Data
(d) Images
Answer: (b) Video
In simple words: Voice, Data, and Images represent different *types* of content. Video is a *medium* that combines audio and visual content, making it distinct from the others which are basic data forms.

🎯 Exam Tip: Consider the granularity of the terms. Voice, image, and generic data are fundamental elements, while video is a compound format of moving images and sound.

 

Question 6.
(a) 1G-1984
(b) 2G-1991
(c) 3G-2003
(d) 4G-2007
Answer: (b) 2G-1991
In simple words: The first generation (1G) started around 1981, 2G around 1991, 3G around 2003, and 4G around 2007. The pairing "1G-1984" seems slightly off from the common launch year of 1981, but 2G-1991 is the exact launch year. However, if we look at the source content (page 14), 1G is 1981, 2G is 1991, 3G is 2003, 4G is 2007. The answer 'b' is 2G-1991 which is correct. Let's re-evaluate. If 1G-1984 is provided as an option, it is a mismatch with 1G-1981. So 1G-1984 is the odd one.

🎯 Exam Tip: Verify historical dates for technology generations. If there's an exact match for one option and slight deviation for another, the deviation is the odd one.

 

Question 7.
(a) TMDA
(b) GSM
(c) MMT
(d) CDMA
Answer: (c) MMT
In simple words: TMDA (Time Division Multiple Access), GSM (Global System for Mobile Communication), and CDMA (Code Division Multiple Access) are all important technologies or standards used in mobile communication. MMT is not a commonly recognized standard in this context.

🎯 Exam Tip: Familiarize yourself with common acronyms and standards in mobile network technology. Unknown acronyms are often the odd one out.

 

Question 8.
(a) UMTS
(b) WCDMA
(c) 1900-2200
(d) 900-180QMhz
Answer: (d) 900-180QMhz
In simple words: UMTS (Universal Mobile Telecommunication System) and WCDMA (Wideband Code Division Multiple Access) are mobile communication technologies. 1900-2200 could refer to a frequency range, but 900-180QMhz (likely 900-1800 MHz) is a common frequency band used in mobile communication, not a technology name. However, the 'QMhz' part makes it an unlikely correct term, making it the odd one.

🎯 Exam Tip: Look for consistency in the type of item. If most options are technology names and one is a frequency or an unstandardized term, that's often the odd one. The 'Q' in 'QMhz' clearly indicates an error.

 

Question 9.
(a) 802.11
(b) CDMA
(c) UMTS
(d) WLAN
Answer: (b) CDMA
In simple words: 802.11, UMTS, and WLAN (Wireless Local Area Network) are all related to wireless local networks or wide-area network standards. CDMA (Code Division Multiple Access) is a specific access method used in mobile communications, which is different from a network standard or type like WLAN.

🎯 Exam Tip: Differentiate between network standards (like 802.11 for Wi-Fi, UMTS for 3G, WLAN for wireless networks) and multiple access techniques (like CDMA or TDMA).

 

Question 10.
(a) Reader
(b) Chip
(c) Antenna Coil
(d) Substrate
Answer: (a) Reader
In simple words: Chip, Antenna Coil, and Substrate are all parts of an RFID tag. The Reader is a separate device that interacts with the tag, not a component of the tag itself.

🎯 Exam Tip: When given components, identify the system they belong to. Here, the tag components form one group, and the external interacting device is the odd one.

 

Question 11.
(a) Network Layer
(b) DataLink Layer
(c) Session Layer
(d) Presentation Layer
Answer: (b) DataLink Layer
In simple words: The Network, Session, and Presentation layers are all higher layers in the OSI model. The DataLink Layer is a lower layer, positioned directly above the Physical Layer, making it the odd one among these.

🎯 Exam Tip: Understand the order and grouping of layers in the OSI model. Sometimes, questions group layers from different conceptual levels (e.g., lower vs. higher) to find the outlier.

 

Question 12.
(a) Bytes
(b) Bits
(c) Packet
(d) Segments
Answer: (a) Bytes
In simple words: Bits, packets, and segments are all fundamental units of data transmission at various network layers. Bytes are a unit of data storage or size, not a unit of transmission in the same networking context as packets or segments.

🎯 Exam Tip: Distinguish between units of data measurement (bits, bytes) and units of data encapsulation for network transmission (packets, segments, frames).

 

Question 13.
(a) IP
(b) SFTP
(c) ICMP
(d) ARP
Answer: (b) SFTP
In simple words: IP (Internet Protocol), ICMP (Internet Control Message Protocol), and ARP (Address Resolution Protocol) are core protocols that work at the network or data link layers. SFTP (SSH File Transfer Protocol) is an application-layer protocol for secure file transfer, which operates at a higher level and has a specific function compared to the fundamental network protocols.

🎯 Exam Tip: Group protocols by their layer in the OSI/TCP-IP model. SFTP is an application-layer file transfer protocol, making it distinct from the lower-layer network management/addressing protocols.

 

Question 14.
(a) HTTP
(b) SMTP
(c) TCP
(d) FTP
Answer: (c) TCP
In simple words: HTTP (Hypertext Transfer Protocol), SMTP (Simple Mail Transfer Protocol), and FTP (File Transfer Protocol) are all application-layer protocols used for specific internet services. TCP (Transmission Control Protocol) is a transport-layer protocol that provides reliable data transfer for these application protocols, making it different.

🎯 Exam Tip: Recognize TCP as a transport layer protocol that provides services to application-layer protocols like HTTP, SMTP, and FTP, rather than being an application protocol itself.

 

Question 15.
(a) X.25
(b) Ethernet
(c) Frame
(d) Relay
Answer: (b) Ethernet
In simple words: X.25, Frame, and Relay are older wide-area network (WAN) technologies or concepts related to them. Ethernet is a local area network (LAN) technology, which operates differently and is used for connecting devices in a smaller area.

🎯 Exam Tip: Differentiate between LAN (Local Area Network) technologies and WAN (Wide Area Network) technologies. Ethernet is a classic example of LAN.

 

Question 1. Match the following;
HTTP – Host Computers
ICMP – Network Communication Protocol
SFTP – Network Management Protocol
DNS – Network Security Protocol
(a) 1234
(b) 4321
(c) 4123
(d) 2134
Answer: (c) 4123
In simple words: The correct combination for matching the items is given by the numerical sequence 4123. This means the first item on the left pairs with the fourth item on the right, and so on.

🎯 Exam Tip: When solving match-the-following questions, always clearly identify which number refers to which item in the lists to avoid confusion.

 

Question 3. Match the following;
E-Commerce – Facebook
Access Employee Database – Internet
Online Discussion – Extranet
Social Media – Intranet
(a) 1234
(b) 3412
(c) 4312
(d) 4132
Answer: (d) 4132
In simple words: The correct order for matching the activities to their descriptions is 4132. This means E-Commerce pairs with Intranet, Access Employee Database with Facebook, Online Discussion with Extranet, and Social Media with Internet.

🎯 Exam Tip: Carefully map each item from the first list to its corresponding item in the second list based on the provided answer code.

 

Question 4. Match the following;
First Generation – GSM Launch
Second Generation – NMT Launch
Third Generation – 2007
Fourth Generation – UK 3G Launch
(a) 3412
(b) 1234
(c) 2143
(d) 3421
Answer: (c) 2143
In simple words: The correct match for each generation with its launch or key technology is represented by the sequence 2143. This means the First Generation matches NMT Launch, Second Generation matches GSM Launch, Third Generation matches UK 3G Launch, and Fourth Generation matches 2007.

🎯 Exam Tip: When the choices are numerical, focus on correctly linking the position of the left-hand item with the position of the right-hand item in the given list.

 

Question 5. Match the following;
First Layer – Data Link Layer
Second Layer – Transport Layer
Third Layer – Physical Layer
Fourth Layer – Session Layer
(a) 1234
(b) 3412
(c) 4312
(d) 4132
Answer: (b) 3412
In simple words: The correct pairing for the OSI layers is 3412. This means the First Layer is Physical Layer, the Second Layer is Session Layer, the Third Layer is Data Link Layer, and the Fourth Layer is Transport Layer.

🎯 Exam Tip: Double-check the order of layers in the standard OSI model and match them carefully with the provided descriptions.

 

Question 6. Match the following;
Application Layer – ARP
Network Layer – FDDI
Presentation Layer – SNMP
Data Link Layer – TSL
(a) 3412
(b) 1234
(c) 2143
(d) 2413
Answer: (d) 2413
In simple words: The correct matches for the layers and their associated protocols or technologies are given by the code 2413. This connects Application Layer with FDDI, Network Layer with TSL, Presentation Layer with ARP, and Data Link Layer with SNMP.

🎯 Exam Tip: Knowing the typical protocols and technologies that operate at each network layer is key to correctly answering these types of matching questions.

 

Protocols and Their usage

 

Short Answer Questions

 

Question 1. Write a note on Extranet?
Answer: An extranet is a special kind of private network that uses internet technology. It allows a business to share information securely with outside groups. These groups can include suppliers, vendors, partners, customers, or other related businesses. This helps in working together more smoothly with external parties.
In simple words: An extranet is like a private internet for a company to share info with specific outside groups safely.

🎯 Exam Tip: Remember to highlight that an extranet uses Internet technology but is private and for external business partners.

 

Question 2. What is mean Network Protocol?
Answer: Network protocols are a set of rules and guidelines that control how data is exchanged between devices on a network. These rules define the format, order, and error checking for data, allowing different devices to communicate effectively. They ensure that all connected devices understand each other when sending and receiving information.
In simple words: Network protocols are rules that let computers talk to each other on a network.

🎯 Exam Tip: Key terms to include are "rules," "procedures," "formats," and "communication between devices."

 

Question 3. What is meant by Li-Fi?
Answer: Li-Fi stands for Light Fidelity. It is a new wireless technology that uses light from LEDs (light-emitting diodes) to send data. Unlike Wi-Fi, which uses radio waves, Li-Fi uses light waves for data transmission. This means that a standard LED light bulb can be used for internet access.
In simple words: Li-Fi is a wireless tech that uses light from LEDs to send data, like Wi-Fi but with light.

🎯 Exam Tip: Define Li-Fi by its full name (Light Fidelity) and clearly state it uses light (LEDs) for data transmission, distinguishing it from Wi-Fi.

 

Question 4. What is mean by cell?
Answer: In a mobile or cellular network, a "cell" refers to a specific geographic area covered by a single base station or antenna. These cells are small areas that, when combined, create a large coverage region. Users can move from one cell to another without losing their connection, which is important for mobile communication.
In simple words: A cell is a small area covered by a mobile network tower, and many cells together make a large service area.

🎯 Exam Tip: Emphasize that a cell is a geographical area and how multiple cells combine to provide wide coverage without connection loss.

 

Question 5. Write a note on Network protocols?
Answer: Network protocols are the agreed-upon rules, formal standards, and procedures that govern communication between different devices on a network. They ensure that data is formatted correctly, transmitted reliably, and understood by all connected devices. Without these protocols, devices wouldn't be able to exchange information effectively.
In simple words: Network protocols are rules and standards that let network devices talk to each other.

🎯 Exam Tip: Explain that protocols are essential for communication, covering aspects like format, rules, and procedures.

 

Question 6. What is the use of Address Resolution Protocol?
Answer: The Address Resolution Protocol (ARP) is used to find the MAC (Media Access Control) address that corresponds to an IP address. When a computer wants to send data to another computer on the same local network, it uses ARP to find the physical hardware address (MAC address) associated with the destination's known IP address. This helps in delivering data packets correctly to the right device.
In simple words: ARP finds a device's physical (MAC) address from its internet (IP) address on a local network.

🎯 Exam Tip: The main function of ARP is to map IP addresses to MAC addresses for local network communication.

 

Question 7. What is mean by DNS?
Answer: DNS stands for Domain Name System. It acts like a phonebook for the internet, translating human-readable domain names (like google.com) into numerical IP addresses (like 172.217.160.142) that computers use. Instead of remembering complex IP numbers, users can simply type website names.
In simple words: DNS changes website names into numbers that computers understand, like a phonebook for the internet.

🎯 Exam Tip: Clearly state that DNS translates domain names into IP addresses, making the internet user-friendly.

 

Part C

 

Question 1. Explain the types of Networking protocols?
Answer: Networking protocols can be broadly categorized into three main types:
1. Network communication protocols: These are the basic protocols used for data exchange, such as HTTP and TCP/IP. They define how data is structured and sent across networks. These are fundamental for any data transmission.
2. Network security protocols: These protocols ensure secure communication over a network. Examples include HTTPS, SFTP, and SSL. They provide encryption and authentication to protect data from unauthorized access.
3. Network management protocols: These protocols help in managing and maintaining networks. They include ICMP and SNMP, which are used for error reporting and monitoring network devices.
In simple words: Networking protocols are divided into three types: for basic talking, for keeping data safe, and for managing the network.

🎯 Exam Tip: List the three main types of protocols and provide a relevant example for each to demonstrate understanding.

 

Question 2. List some applications of the Internet.
Answer: The internet has many applications that we use every day:
• We can download programs and files from the internet.
• It's used for social media platforms.
• We use it for sending and receiving emails.
• Online banking allows us to manage money.
• Audio and video conferencing connect people remotely.
• E-commerce lets us buy and sell things online. This has revolutionized how people shop.
• File sharing makes it easy to send large files.
• E-governance provides government services online.
• Information browsing helps us find facts and news.
• Search engines help us find web addresses.
• Chatting applications allow instant messaging.
In simple words: The internet is used for many things like downloading files, social media, emails, online banking, shopping, and chatting.

🎯 Exam Tip: When listing applications, aim for a diverse range covering communication, commerce, information, and entertainment.

 

Question 3. What are Mobile Networks?
Answer: Mobile networks, also known as cellular networks, are made up of many small signal areas called "cells." Each cell is served by a base station (like a mobile tower). These cells work together to form a large, connected coverage area, allowing people to communicate through voice, data, images, and text messages. As a user moves, their device seamlessly switches between cells.
In simple words: Mobile networks use many small signal areas, called cells, connected to towers to let people communicate on the go.

🎯 Exam Tip: Remember to define a "cell" as a signal area and explain how multiple cells combine for wide mobile communication coverage.

 

Question 4. List some Applications of the Extranet.
Answer: Extranets are very useful for businesses when working with external partners:
• They enable customer communications, such as support and updates.
• Used for online education or training for partners.
• Allow checking account status and financial inquiries.
• Provide inventory inquiry for suppliers to see stock levels.
• Facilitate online discussions with partners. Extranets help keep business communication organized.
• Support supply chain management.
• Help with order status inquiry.
• Manage warranty registration.
• Handle claims processing.
• Used for distributor promotions.
In simple words: Extranets are used for talking with customers, training, checking accounts and inventory, managing orders, and supporting business partners.

🎯 Exam Tip: Focus on applications that involve sharing information and collaborating with entities *outside* the immediate organization.

 

Question 5. Write a note on Network protocols?
Answer: Network protocols are a set of rules and guidelines that computers and other network devices follow to communicate with each other. These rules define how data is formatted, transmitted, received, and processed. Protocols ensure that all devices on a network understand each other, enabling seamless and orderly data exchange. They are essential for any network to function properly.
In simple words: Network protocols are the set of rules that allow different devices on a network to talk to each other correctly.

🎯 Exam Tip: When defining network protocols, remember to emphasize their role in ensuring effective communication and data exchange.

 

Question 6. Explain the working process of TCP
Answer: TCP/IP is a combination of two main protocols: Transmission Control Protocol (TCP) and Internet Protocol (IP).
• IP handles the "logistics" of data packets. It specifies how packets are addressed and routed to their destination across networks. Think of it as the mailing address system.
• TCP is responsible for reliable data transmission. It ensures that all data packets arrive at their destination correctly and in order. If any packets are missing or have errors, TCP requests them to be sent again. This makes sure the complete message arrives intact.
In simple words: TCP/IP works together; IP sends data packets to the right place, and TCP makes sure all packets arrive safely and correctly.

🎯 Exam Tip: Clearly distinguish the roles of TCP (reliability, error checking) and IP (addressing, routing) when explaining TCP/IP.

 

Question 6. Write the disadvantages of the First Generation of Mobile Networks?
Answer: The First Generation (1G) of mobile networks had several drawbacks:
• They had very low traffic density, meaning only a few calls could be handled at one time on a radio channel. This limited network capacity significantly.
• The voice quality was generally very poor, often with static and unclear sound.
• The transmissions were insecure and unencrypted, making them vulnerable to eavesdropping. This lack of security was a major concern for users.
In simple words: First Generation mobile networks had low call capacity, poor voice quality, and insecure calls that could be listened to.

🎯 Exam Tip: Focus on the three main limitations: low capacity, poor voice quality, and lack of security, for 1G networks.

 

Question 7. Write short notes on Second to Third Generation Bridge of Mobile Networks
Answer: The Second to Third Generation Bridge, often referred to as 2.5G, marked an important period in mobile networking development. This phase introduced GPRS (General Packet Radio Service). GPRS was a data service that enabled mobile devices to send and receive messages, picture messages, and emails more efficiently. It offered higher data speeds compared to 2G, typically reaching rates around 9.6 kbit/s, which was a significant improvement for internet use on mobile phones.
In simple words: The 2.5G bridge brought GPRS, a data service that let phones send messages and emails faster than 2G, improving mobile internet.

🎯 Exam Tip: Highlight GPRS as the key technology of the 2.5G bridge and its role in improving data services like messaging and email.

 

Question 8. Write short notes on Wi-Fi.
Answer: Wi-Fi stands for Wireless Fidelity. It is a wireless network technology that allows computers and other devices to connect to a local area network (LAN) and the internet without using cables. Wi-Fi networks typically use the 802.11 technical standard. This technology has made it easy to connect multiple devices to a network at home or in public places.
In simple words: Wi-Fi is a wireless technology that lets devices connect to networks and the internet without wires.

🎯 Exam Tip: Include the full form of Wi-Fi, its wireless nature, and its function in connecting devices to networks and the internet.

 

Part D

Detailed Answers

 

Question 1. Explain in detail about Second Generation of Mobile Networks.
Answer: The Second Generation (2G) of mobile systems, introduced in 1991, represented a major shift from analog to digital transmission. The primary technology for 2G was GSM (Global System for Mobile communication), which became the most popular standard. GSM operated on frequency bands like 900MHz and 1800MHz.
2G systems also used transmission methods like TMDA (Time Division Multiple Access) and CDMA One (Code Division Multiple Access) to increase the amount of information that could be carried on the network. GSM mobile systems also incorporated SIM (Subscriber Identity Module) technology for user authentication and billing, and to encrypt data for privacy.
In simple words: 2G mobile networks switched to digital, using GSM as the main standard and new technologies like TMDA and CDMA to send more data securely.

🎯 Exam Tip: Emphasize the transition from analog to digital, GSM as the key standard, and the role of SIM cards for security and user identification.

 

Question 2. Explain the important protocols present in 1. Network layer 2. Transport Layer
Answer: Here are important protocols found in the Network and Transport layers:
Network Layer: This is the layer where data is addressed, packaged into packets, and routed between networks.
• Internet Protocol (IP): This is a routable protocol that uses IP addresses to deliver packets. It's often considered an unreliable protocol because it doesn't guarantee delivery or error checking on its own.
• Address Resolution Protocol (ARP): This protocol resolves IP addresses to MAC (Media Access Control) addresses. A MAC address is a unique hardware identification number for each device on a network, and ARP maps IP addresses to these physical addresses.
• Internet Control Message Protocol (ICMP): Network devices use ICMP to send error messages and operational information. For example, it can report when a host or router cannot be reached.
• Internet Group Management Protocol (IGMP): This communication protocol allows hosts and routers to send Multicast messages (group communication) to multiple IP addresses at once.
Transport Layer: This layer handles the sessions and exchanges data packets between different hosts.
• Transmission Control Protocol (TCP): TCP provides a reliable, connection-oriented transmission between two hosts. It ensures that data packets are delivered completely and in the correct order, retransmitting any missing or corrupted packets.
• User Datagram Protocol (UDP): UDP offers connectionless and unreliable data delivery. It's faster than TCP but doesn't guarantee that packets will arrive or be in order. It's often used for real-time applications like video streaming where speed is more critical than guaranteed delivery.
In simple words: The Network layer uses protocols like IP, ARP, ICMP, and IGMP to address and route data packets. The Transport layer uses TCP for reliable, ordered data delivery and UDP for faster, less reliable delivery.

🎯 Exam Tip: For each layer, clearly state its main function and list the key protocols, briefly explaining what each protocol does. Focus on the distinction between connection-oriented (TCP) and connectionless (UDP) transport.

 

Question 3. Write short notes on Fourth Generation of Mobile Networks
Answer: Fourth Generation (4G) mobile networks, launched around 2007, significantly improved upon earlier generations. While still in the research stage initially, 4G was based on an Adhoc networking model, which did not require a fixed infrastructure. Adhoc networking also featured global mobility and used IPv6 to assign IP addresses to mobile devices.
4G enabled logical roaming across various IP networks like 802.11 WLAN, GPRS, and UMTS, offering much higher data rates, typically from 2Mbit/s to 10-100Mbit/s. This meant faster internet and reduced delays, allowing for many new services like high-quality video streaming.
In simple words: 4G networks brought much faster data speeds, allowed devices to roam across different networks, and improved internet services, using new networking models.

🎯 Exam Tip: Focus on the key advancements of 4G: higher data rates, global mobility features, and reduced delays, along with its Adhoc networking model.

 

Question 4. Explain about Fifth Generation of Mobile Networks
Answer: Fifth Generation (5G) is the latest stage in mobile network technology, succeeding 4G (LTE/WiMAX), 3G (UMTS), and 2G (GSM) systems. 5G aims for significantly enhanced performance with very high data rates, reduced latency (delay), and improved energy saving. It is designed to support a much higher system capacity and connect a massive number of devices.
The development of 5G involves different phases, with Release-15 completed by March 2019 and Release-16 expected by March 2020. The ITU (International Telecommunication Union) recognized 5G as the IMT-2020 technology standard. 5G provides speeds of up to 20 gigabits per second, demonstrated using millimeter waves at 15 gigahertz and higher frequencies. This technology will unlock new possibilities for connected devices and applications. 3GPP standards include New Radio software, allowing 5G to access lower frequencies from 600 MHz to 6 GHz. While faster at lower frequencies, the speed increase compared to 4G is estimated to be between 15% to 50% faster.
In simple words: 5G is the newest mobile network, offering very fast speeds, low delays, and connecting many devices. It uses new technologies to greatly improve on 4G.

🎯 Exam Tip: Highlight 5G's main goals: high data rates, low latency, energy saving, and massive device connectivity, mentioning its ITU standardization and speed capabilities.

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