CBSE Class 10 Computer Science Internet and Computer Networks Worksheet Set 01

Answer: TCP/IP

Teacher's Note:
1. TCP/IP defines how data is divided into packets, addressed and delivered.
2. Remember this as a basic fact of the Internet.

Answer: bandwidth

Teacher's Note:
1. It is measured in bits per second.
2. Remember this as a basic fact of the Internet.

Answer: ARPANET

Teacher's Note:
1. It was funded by the US Advanced Research Projects Agency in 1969.
2. Remember this as a basic fact of the Internet.

Answer: HTML

Teacher's Note:
1. HTML stands for Hyper Text Markup Language.
2. Remember this as a basic fact of the Internet.

Answer: web browsers

Teacher's Note:
1. A browser is software used to view websites.
2. Remember this as a basic fact of the Internet.

Answer: HTTP

Teacher's Note:
1. HTTPS is its secure version.
2. Remember this as a basic fact of the Internet.

Answer: World Wide Web

Teacher's Note:
1. It is a collection of linked web pages on the Internet.
2. Remember this as a basic fact of the Internet.

Answer: gateway

Teacher's Note:
1. A router connects similar networks, while a gateway also converts protocols.
2. Remember this as a basic fact of the Internet.

Answer: bits per second (bps)

Teacher's Note:
1. Larger units are kbps, Mbps and Gbps.
2. Remember this as a basic fact of the Internet.

Answer: 1991

Teacher's Note:
1. He proposed the idea in 1989 at CERN.
2. Remember this as a basic fact of the Internet.

Answer: A website is a collection of related web pages under one domain name. A web portal is a web page or site that gathers information and links from many sources, such as news, mail and search, in one place.

Teacher's Note:
1. A portal acts as a gateway to other sites.
2. A single organisation's pages form a website.

Answer:

1. Availability of content: information is available 24 hours a day, 7 days a week and can be updated in real time.

2. Quick search: search engines let users find information quickly and efficiently.

Teacher's Note:
1. Other features are hypertext links and multimedia support.
2. Give each feature with a short explanation.

Answer: ISP stands for Internet Service Provider, a company that provides Internet access to users. Examples: Airtel, BSNL, Jio.

Teacher's Note:
1. ISPs provide modems, broadband or wireless connections.
2. Any two valid names are accepted.

Answer: Google and Bing (also Yahoo, DuckDuckGo).

Teacher's Note:
1. A search engine finds web pages for the words typed by a user.
2. Do not confuse a search engine with a browser.

Answer: (a) .info (b) .net (c) .edu (d) .org

Teacher's Note:
1. A domain extension indicates the type of entity or its country.
2. Commercial sites use .com and governments use .gov.

Answer: (a) Uniform Resource Locator (b) Hyper Text Transfer Protocol (c) Transmission Control Protocol (d) Hyper Text Markup Language

Teacher's Note:
1. Write each expansion without abbreviations.
2. HTTP and TCP are protocols; HTML is a markup language.

Answer: A Wi-Fi hotspot is an Internet access point in a public place where users can connect to wireless broadband with a Wi-Fi enabled device.

Teacher's Note:
1. Airports, cafes and railway stations commonly offer hotspots.
2. Public hotspots may be less secure than home networks.

Answer:

1. Education: it allows learning anytime and anywhere and is widely used for research.

2. E-services: online banking, ticket booking, shopping and job searching are available at any time.

Teacher's Note:
1. Other advantages are fast communication and entertainment.
2. Support each point with an example.

Answer: In 1969 the Advanced Research Projects Agency of the US Department of Defense connected four computers in a network so that they could share data. The first message was sent between UCLA and SRI. This network, ARPANET, grew into the Internet as more networks joined it using common protocols.

Teacher's Note:
1. ARPANET is regarded as the first working packet-switching network.
2. Mention the year, the purpose and the outcome.

Answer:

1. Google Chrome

2. Mozilla Firefox

3. Microsoft Edge

4. Apple Safari (Opera is another example)

Teacher's Note:
1. Browsers display web pages written in HTML.
2. Internet Explorer is now discontinued.

Answer: Google Chrome was developed by Google and released in 2008; it is known for speed, security and a simple interface. Mozilla Firefox is a free, open-source browser developed by the Mozilla Foundation; it is known for privacy features and add-ons.

Teacher's Note:
1. Mention the developer and one key feature of each.
2. Both work on many operating systems.

Answer:

1. Wi-Fi: Wireless Fidelity is a wireless local area network technology based on IEEE 802.11 standards, used with a router.

2. Wi-Fi hotspot or mobile data: hotspots give access in public places, and mobile networks such as 4G and 5G give access through a SIM or a phone's hotspot.

Teacher's Note:
1. Wireless broadband needs no cable between the device and the access point.
2. Name the technology and describe how it is used.

Answer: In 1957 the USSR launched Sputnik, the first artificial satellite. In response, the US Department of Defense set up the Advanced Research Projects Agency (ARPA). In 1969 ARPA connected four computers to exchange data, forming ARPANET. Over the next decades more networks were linked using TCP/IP, and in 1991 the World Wide Web was made public, making the Internet popular.

Teacher's Note:
1. Arrange the events in time order.
2. Mention ARPANET and the WWW.

Answer: An intranet is a private network inside an organisation, using Internet technology to share files and resources securely among its own staff. An extranet extends part of that intranet to outsiders such as partners, vendors and suppliers, giving access only to specific services and not the whole network.

Teacher's Note:
1. The difference lies in who is allowed to use the network.
2. Both are protected by login and firewalls.

Answer:

1. IP address: a unique numeric address for each device. IPv4 has 32 bits written as four numbers from 0 to 255 separated by dots, e.g. 192.168.1.1. IPv6 uses 128 bits.

2. Domain Name System (DNS): since numbers are hard to remember, each website is given a unique name such as www.example.com, and DNS servers convert the name into its IP address.

Teacher's Note:
1. Computers use numbers, while people prefer names.
2. DNS works like a telephone directory for websites.

Answer:

1. PAN: network of personal devices within a few metres, e.g. phone and earbuds.

2. LAN: network in a room, building or campus, such as a school computer lab.

3. MAN: network covering a city or large campus.

4. WAN: network spread over countries or continents; the Internet is the largest WAN.

Teacher's Note:
1. Networks are classified by the area they cover.
2. Give an example for each type.

Answer:

1. Cyber threats such as viruses, phishing, hacking and identity theft.

2. Excessive use can waste time, affect health and expose users to harmful or false content.

Teacher's Note:
1. The Internet should be used with care and awareness.
2. Mention one security risk and one personal effect.