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Networks Class 8 Computer

Networks
A Fill in the blanks with the correct words.
1. A computer network is a collection of interconnected computers that are equipped to exchange information.
2. Any computer connected to the server is called a workstation.
3. A switch can be considered as an intelligent hub.
4. A router is a network device that forwards packets from one network to another.
5. Infrared technology is used in remote controls.

B State whether True or False. Correct the false statement(s).
1. A CAN is much larger in extent than a WAN. (False)
(A CAN is much smaller in extent than a WAN)
2. A switch broadcasts data to all the computers connected to it. (False)
(A hub broadcasts data to all the computers connected to it)
3. An optical fiber cable can transmit voice, video, and data at an extremely high speed. (True)
4. A transmitted signal never gets weak on a computer network. (False)
(A transmitted signal can get weak on a computer network)
5. You will normally find a router for Wi-Fi connection at homes. (True)

C Choose the correct option.
1. This device is used to connect one LAN to another that use the same protocol.
a. Switch
b. Modem
c. Repeater
d. Bridge
2. Which among the following is/are the advantage(s) of networking?
a. Reliability
b. Resource sharing
c. Cost effectiveness
d. All of these
3. This type of network is used in a city.
a. PAN
b. LAN
c. MAN
d. WAN
4. This technology is used to transfer songs from one mobile phone to another.
a. Wi-Fi
b. Bluetooth
c. Infrared
d. Both (a) and (b)
5. This device is used to connect a computer to the Internet.
a. Hub
b. Switch
c. Modem
d. None of these

D Answer the following.
1. What is a computer network? Write any two of its advantages.
It is a collection of interconnected computers to exchange information and share resources with each other. Two advantages are:
a) Reliability
b) Resource sharing

2. What are the classifications of computer networks based on the coverage area?
PAN, LAN, CAN, MAN, WAN.

3. What is a protocol? Describe a few protocols used on the Internet.
It is a set of rules that computers use to communicate with each other across a network. Some protocols used on the Internet:
a) TCP: Used to divide a message into packets and then re-assemble them in the destination.
b) HTTP: To transfer information on the Web.

4. What is URL? What are its two types?
It is a unique address identifying a file on the Web. Two types of URL:
a) Number address (IP address)
b) Letter address (DNS)

5. Explain the working of Wi-Fi.
The computer’s Wi-Fi translates data into radio signal and then transmits it. The Wi-Fi router receives the signal and decodes it, and then sends the information on the Internet. This process also works in reverse in the receiving end.

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