Computer Networks-Quiz

Identify the type of connection in the figure below.

• Point-to-point
• Multi-point
• Multimodal
• Multi-Dimensional

Which of the following is not true about a Star network?

• A star topology is less expensive than mesh topology
• A star topology does not allow direct traffic between devices.
• The devices are dependent on the central controller or central hub
• A star topology is more expensive than a mesh topology

The Physical layer of OSI model is responsible for movements of ___ from one hop to the other

• BIts
• Frames
• Packets
• Headers

A digital signal has eight levels. How many bits are needed per level?

• 2
• 3
• 4
• 5

Suppose a signal travels through a transmission medium and its power is reduced to one-half. Calculate the loss of power in dB in this process.

• 3
• 1
• 8
• 2

The SNR for a completely noiseless channel is______

• 0
• 1
• 1/2
• Infinity

For a noiseless channel of bandwidth of 3000 Hz transmitting a signal with two signal levels. The maximum bit rate can be calculated as-

• 6 kbps
• 60 kbps
• 600 kbps
• 60 bps

A file contains 2 million bytes. How long does it take to download this file using a 56-Kbps channel?

• 1-2 mins
• 5-6 mins
• 2-4 mins
• 7-8 mins

A complex band pass signal has a bandwidth of 200 kHz. What is the minimum sampling rate for this signal?

• 400 KHz
• 200 KHz
• 100 KHz
• It is not possible to find out

What is true about resource allocation in a virtual circuit network?

• Resources are reserved before the communication takes place
• Resources are allocated on demand
• Resources are never allocated
• None of the above