Case Based MCQ Questions

Computer Science - Class 12
Chapter 10 - Computer Networks

## (D) Mesh

Checking the options

(A) Star - In star topology, each communicating device is connected to a central node , which is a networking device like a hub or a switch .

(B) Ring - In ring topology, each node is connected to two other devices, one each on either side.

(C) Bus - In this networking topology , all the nodes are connected to a single transmission medium.

(D) Mesh - In this networking topology, each communicating device is connected with every other device in the network

In the givenl ayout, there is a thick cable which runs through the centre and all the other nodes are connected to it. So the layout is a bus topology.

So, the correct answer is (C)

## (D) Data-transfer speed is very high

• In bus topology , each communicating device connects to a transmission medium, known as bus.
• Data sent from a node are passed on to the bus and are transmitted through the length of the bus in both directions. That means, data can be received by any of the nodes connected to the bus.
• The data-transfer speed of bus topology is very low as compared  to other topologies since transmission from any node has to travel the length of the bus to reach all the stations.
• In this topology, a single backbone wire called bus is shared among the nodes, which makes it cheaper and easier to connect or remove devices.

Checking the options

• (A) Connects peripherals or computers in a linear  fashion - This is true.
• (B) Easy to connect or remove devices in this network  - This is true.
• (C) Very cost-effective  - This is true.
• (D) Data-transfer speed is very high - This is false.

So, the correct answer is (D)

## (D) All of these

Bus Topology is used to connect devices over small areas.

Checking the options

• (A) School Computer lab - It can be connected using bus topology because it is spread over only a small area.
• (B) Offices in two separate buildings - It cannot be connected using bus topology because it is spread over a large area.
• (C) Two floors of an office  - It can be connected using bus topology because it is spread over a small area.
• (D) All of these

Since, offices in two separate buildings cannot be connected using bus topology.

So, the correct answer is (B)

## (D) Telephone lines

Checking the options

• (A) Twisted pair - used in star and ring topology
• (B) Coaxial cable - used in bus topology
• (C) Fiber optic - used in star and ring topology
• (D) Telephone lines

Bus Topology uses coaxial cables for connection because they are highly durable and easy to install.

So, the correct answer is (B)

## (D) Hybrid topology

From the image, it is clear that bus Topology connects peripherals or computers in a linear manner.

Checking the options

• (A) Circular topology - This is false
• (B) Linear topology - This is true
• (C) Ring topology - This is false
• (D) Hybrid topology - This is false

So, the correct answer is (B)

Learn in your speed, with individual attention - Teachoo Maths 1-on-1 Class