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3. Name the four components of a communication system.
Ans. Sender, Receiver, Message and Channel.
4. Give any two ways to connect devices wirelessly.
Ans. Bluetooth, Wi-fi
5. Among LAN, MAN and WAN, which can cover the maximum area?
Ans. WAN
6. Define the term topology.
Ans. The physical arrangement of the computer systems in a computer network connected via communication medium is called
topology.
7. What are the disadvantages of bus topology?
Ans. (i) Locating a fault is difficult
(ii) It becomes slow with an increase in the number of nodes
8. Give three examples of the physical medium of communication.
Ans. Telephone line, coaxial cable and optical fibre.
9. Write functions of a modem.
Ans. Functions of modem in computer networking –
• Data compression
• Modulation/demodulation of signals
11. Differentiate between a router and a switch.
Ans. Router Switch
1. The main objective of a router is to connect to 1. The main objective of a switch is to connect various devices
various networks. in a local area network.
2. A router is used in all types of networks 2. A switch is typically used in LANs.
12. Differentiate between a router and gateway.
Ans. Router Gateway
1. It is used to manage and forward data packets to 1. It is a hardware device that acts as a gate between the
computer networks. networks.
2. Works by installing routing details for multiple 2. Ensures compatibility between the protocols of the incoming
networks and routes the traffic based upon the and outgoing traffic.
destination address.
13. ABC University of Uttarakhand is setting up a secured network for its campus at Rishikesh for operating its day-to-day office
& web-based activities. They are planning to have network connectivity between four buildings.
Answer the question (i) to (iii) after going through the building positions in the campus and other details given below:
Professional Academic
Studies
Admin
Sports Centre
Computer Networks 239

