CBSE Class 8 Computer Science Downloading Uploading Notes

Bandwidth is the bit-rate of available or consumed information capacity expressed typically in metric multiples of bits per second. Variously, bandwidth may be characterized as network bandwidth, data bandwidth, or digital bandwidth.

Bandwidth is a term used in the field of signal processing, wireless communications, modem data transmission, digital communications, and electronics, in which bandwidth is used to refer to analog signal bandwidth measured in hertz, meaning the frequency range between lowest and highest attainable frequency while meeting a well-defined impairment level in signal power.

Protocols are rules exist at several levels in a telecommunication connection. Example, there are protocols for the data interchange at the hardware device level and protocols for data interchange at the application program level. In Open Systems Interconnection (OSI), there are one or more protocols at each layer in the telecommunication exchange that both ends of the exchange must recognize and observe.

The TCP/IP Internet protocols, a common example, consist of:

• Transmission Control Protocol (TCP), which uses a set of rules to exchange messages with other Internet points at the information packet level

• Internet Protocol (IP), which uses a set of rules to send and receive messages at the Internet address level

• Other Protocol are Hypertext Transfer Protocol (HTTP) and File Transfer Protocol (FTP),

SUMMARY

1. Downloading refers to copying a file from network file server to the computer on the networ

2. Uploading refers to copying a file from computer to the network file server.

3. The time that it takes to upload or download a file depends on several factor The main factor is the digital size of the file, which is measured in bytes.

4. Uploading and downloading occur frequently, often without the user being aware that he or she is doing For example, incoming email is downloaded from a server.

5. Bandwidth is the bit-rate of available or consumed information capacity expressed typically in metric multiples of bits per second.

6. Protocols are the common set of rules which is used by the computer on the network to communicate different types of device

7. In Open Systems Interconnection (OSI), there are one or more protocols at each layer in the telecommunication exchange that both ends of the exchange must recognize and observe.

8. Transmission Control Protocol (TCP), which uses a set of rules to exchange messages with other Internet points at the information packet level

9. Internet Protocol (IP), which uses a set of rules to send and receive messages at the Internet address level

10. Other Protocol are Hypertext Transfer Protocol (HTTP) and File Transfer Protocol (FTP).

EXERCISES

A. Fill in the blanks

i. _________reafers to copying a file from network file server to the computer on the network.

ii._________refers to copying a file from computer system to the network file server.

iii. ________is bit rate of available or consumed information capacity.

iv. _________is common set of rules.

B. Short Answer Questions

i. What is Downloading?

ii. What is Uploading?

iii. Write one difference between Downloading and Uploading.

iv. Give few example of Downloading and Uploading

v. What is TCP/IP Protocol?

vi. Write full forms of:

a) FTP

b) TCP

c) IP

d) HTTP

e) OSI

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