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3. A protocol used for transferring email messages over the network is _________.

4. _________ are omnidirectional and can penetrate buildings easily.

5. _________ is usually used by international business organisations for their operations.

C. Write ‘T’ for True and ‘F’ for False statement.

1. The central device in a star topology is called a hub. _______
2. Different computers in the same network can follow different protocols. _______

3. Optical fibre cable provides the fastest speeds of data transmission among all wired
transmission media. _______
4. Cable television network is an example of a LAN. _______

5. A single satellite can receive and transmit data from a number of earth stations. _______

D. Answer the following questions.

1. What do you mean by computer networks? State any four advantages of computer networking.
2. Describe the types of computer networks based on the geographical area covered by them.

3. What is a topology? Explain any three topologies used in computer networks.
4. How are microwaves different from radio waves as transmission media?

5. What are protocols? Write the full form of the following protocols and give the use of each:
(a) IP (b) FTP (c) HTTP (d) TCP

6. What are network devices? State the use of the following networking devices:
(a) Modem (b) Switch (c) NIC (d) RJ-45

7. State some limitations of computer networks.

Mind Stretching
1. A school wants to set up a computer network between the three computer labs in the school
building. Which type of network topology, transmission media, and network device should be
used for the purpose? Logical Thinking
2. Shalu wants to transfer some photographs from her smartphone to her mother’s smartphone.
Name the transmission media that she should use for the task. Critical Thinking

DISCUSS
DISCUSS Communication Skills
Can the Internet replace all computer networks of the world? Discuss with your classmates.

TEACHER’S DESK
TEACHER’S DESK
Explain to the students the various components of a computer network and their uses.

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