SONET - Computer Networks Questions and Answers

1.

In SONET, STS-1 level of electrical signalling has the data rate of

   A.) 51.84 Mbps
   B.) 155.52 Mbps
   C.) 466.56 Mbps
   D.) none of these

Answer: Option 'A'

51.84 Mbps

2.

SONET stands for

   A.) synchronous optical network
   B.) synchronous operational network
   C.) stream optical network
   D.) shell operational network

Answer: Option 'A'

synchronous optical network

3.

The photonic layer of the SONET is similar to the _____ of OSI model.

   A.) network layer
   B.) data link layer
   C.) physical layer
   D.) none of these

Answer: Option 'C'

physical layer

4.

Automatic protection switching in linear network is defined at the

   A.) line layer
   B.) section layer
   C.) photonic layer
   D.) path layer

Answer: Option 'A'

line layer

5.

The path layer of SONET is responsible for the movement of a signal

   A.) from its optical source to its optical destination
   B.) across a physical line
   C.) across a physical section
   D.) none of these

Answer: Option 'B'

across a physical line

6.

Which one of the following is not true about SONET?

   A.) multiplexing is synchronous TDM
   B.) all clocks in the network are locked to a master clock
   C.) frames of lower rate can be synchronously time-division multiplexed into a higher-rate frame
   D.) none of these

Answer: Option 'D'

none of these

7.

In SONET, each synchronous transfer signal STS-n is composed of

   A.) 2000 frames
   B.) 4000 frames
   C.) 8000 frames
   D.) 16000 frames

Answer: Option 'C'

8000 frames

8.

What is SDH?

   A.) SDH is similar standard to SONET developed by ITU-T
   B.) synchronous digital hierarchy
   C.) both (a) and (b)
   D.) none of these

Answer: Option 'C'

both (a) and (b)

9.

A unidirectional path switching ring is a network with

   A.) one ring
   B.) two rings
   C.) three rings
   D.) four rings

Answer: Option 'B'

One ring is used as the working ring and other as the protection ring.

10.

A linear SONET network can be

   A.) point-to-point
   B.) multi-point
   C.) both (a) and (b)
   D.) none of these

Answer: Option 'C'

both (a) and (b)


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