Forouzan: MCQ in SONET / SDH

(Last Updated On: April 20, 2018)
Multiple choice questions for SONET/SDH
This is the MCQ in Synchronous Optical Network (SONET) / Synchronous Digital Hierarchy (SDH) from the book the Data Communications and Networking 4th Edition by Behrouz A. Forouzan. If you are looking for a reviewer in datacom, topic in Electronics Systems and Technologies (Communications Engineering) this will definitely help you before taking the Board Exam.

The topic discuss the Synchronous Optical Network (SONET) which is a standard developed by ANSI for fiber-optic networks while the Synchronous Digital Hierarchy (SDH) is a similar standard developed by ITU-T. If you skip the summary and important terminology visit SONET/SDH .

Begin and Good luck!

Choose the letter of the best answer in each questions.

1. In SONET each frame lasts _______ microseconds.

A)   20

B)   64

C)   125

D)   none of the above

View Answer:

Answer: Option C

Solution:

2. A linear SONET network can be __________.

A)   multipoint

B)   point-to-point

C)   either (a) or (b)

D)   neither (a) nor (b)

View Answer:

Answer: Option C

Solution:

3. The path overhead consists of ______ bytes.

A)   18

B)   9

C)   6

D)   1

View Answer:

Answer: Option B

Solution:

4. _______ is a standard developed by ITU-T.

A)   SONET

B)   SDH

C)   either (a) or (b)

D)   neither (a) nor (b)

View Answer:

Answer: Option B

Solution:

5. A ______ is the portion of the network between two multiplexers.

A)   line

B)   path

C)   section

D)   none of the above

View Answer:

Answer: Option A

Solution:

6. A ________ is a repeater.

A)   ADM

B)   regenerator

C)   STS multiplexer/demultiplexer

D)   none of the above

View Answer:

Answer: Option B

Solution:

7. The ______ layer is responsible for the movement of a signal across a physical section.

A)   path

B)   section

C)   photonic

D)   line

View Answer:

Answer: Option B

Solution:

8. In ______ APS, there is one working line and one protection line. The data are normally sent on the working line until it fails.

A)   one-to-one

B)   one-plus-one

C)   one-to-many

D)   none of the above

View Answer:

Answer: Option A

Solution:

9. Line overhead consists of ________ bytes.

A)   18

B)   9

C)   6

D)   1

View Answer:

Answer: Option A

Solution:

10. In SONET, for each frame, the bytes are transmitted __________.

A)   from left to the right, bottom to top

B)   from left to the right, top to bottom

C)   from right to the left, top to bottom

D)   from right to the left, bottom to top

View Answer:

Answer: Option B

Solution:

11. Each ________in a SONET frame can carry a digitized voice channel.

A)   frame

B)   bit

C)   byte

D)   none of the above

View Answer:

Answer: Option C

Solution:

12. An STS-1 frame is made ______columns.

A)   90

B)   9

C)   1

D)   none of the above

View Answer:

Answer: Option A

Solution:

13. The ______ layer is responsible for the movement of a signal from its optical source to its optical destination.

A)   line

B)   path

C)   photonic

D)   section

View Answer:

Answer: Option B

Solution:

14. The ____ layer is responsible for the movement of a signal across a physical line.

A)   line

B)   path

C)   photonic

D)   section

View Answer:

Answer: Option A

Solution:

15. An STS multiplexer is a ______ device.

A)   four-layer

B)   three-layer

C)   two-layer

D)   one-layer

View Answer:

Answer: Option A

Solution:

16. A ring SONET network can be _________.

A)   bidirectional

B)   unidirectional

C)   either (a) or (b)

D)   neither (a) nor (b)

View Answer:

Answer: Option C

Solution:

17. _______ is a standard developed by ANSI for fiber-optic networks.

A)   SDH

B)   SONET

C)   either (a) or (b)

D)   neither (a) nor (b)

View Answer:

Answer: Option B

Solution:

18. An add/drop multiplexer is a ______ device.

A)   four-layer

B)   three-layer

C)   two-layer

D)   one-layer

View Answer:

Answer: Option B

Solution:

19. In SONET, for each byte, the bits are transmitted ____________.

A)   from most significant to the least significant

B)   from least significant to the most significant

C)   three at a time

D)   two at a time

View Answer:

Answer: Option A

Solution:

20. A _______ is the optical link connecting two neighbor devices.

A)   path

B)   line

C)   section

D)   none of the above

View Answer:

Answer: Option C

Solution:

21. A ______is the end-to-end portion of the network between two STS multiplexers.

A)   line

B)   path

C)   section

D)   none of the above

View Answer:

Answer: Option B

Solution:

22. The _______ layer corresponds to the physical layer of the OSI model.

A)   photonic

B)   path

C)   line

D)   section

View Answer:

Answer: Option A

Solution:

23. SONET is a _______ TDM system.

A)   statistical

B)   asynchronous

C)   synchronous

D)   none of the above

View Answer:

Answer: Option C

Solution:

24. An STS-3 frame is made of ______ rows.

A)   27

B)   9

C)   1

D)   none of the above

View Answer:

Answer: Option B

Solution:

25. SONET defines _______ layers.

A)   five

B)   four

C)   three

D)   two

View Answer:

Answer: Option B

Solution:

26. In ________ APS, there are normally two lines: one working line and one protection line. Both lines are active all the time.

A)   one-to-one

B)   one-to-many

C)   one-plus-one

D)   none of the above

View Answer:

Answer: Option C

Solution:

27. __________ allow insertion and extraction of signals.

A)   STS multiplexer/demultiplexers

B)   regenerators

C)   ADMs

D)   none of the above

View Answer:

Answer: Option C

Solution:

28. An STS-3 frame is made of ________ columns.

A)   270

B)   90

C)   9

D)   none of the above

View Answer:

Answer: Option A

Solution:

29. SONET has defined a hierarchy of signals called ________.

A)   STMs

B)   STSs

C)   either (a) or (b)

D)   neither (a) nor (b)

View Answer:

Answer: Option B

Solution:

30. An ______ signal is the optical modulation of an STS-n (or STM-n) signal.

A)   FDM-n

B)   OC-n

C)   TDM-n

D)   none of the above

View Answer:

Answer: Option B

Solution:

31. A regenerator is a ________ device.

A)   three-layer

B)   one-layer

C)   two-layer

D)   four-layer

View Answer:

Answer: Option C

Solution:

32. An STS-1 frame is made of ________ rows

A)   90

B)   9

C)   1

D)   none of the above

View Answer:

Answer: Option B

Solution:

33. SDH has defined a hierarchy of signals called ________.

A)   STMs

B)   STSs

C)   either (a) or (b)

D)   neither (a) nor (b)

View Answer:

Answer: Option A

Solution:

34. To make SONET backward-compatible with the current hierarchy, its frame design includes a system of ____.

A)   VTs

B)   STSs

C)   STMs

D)   OCs

View Answer:

Answer: Option A

Solution:

35. SONET network topologies can be __________.

A)   ring

B)   mesh

C)   linear

D)   all of the above

View Answer:

Answer: Option D

Solution:

36. SONET sends ________ frames per second.

A)   8000

B)   4000

C)   2000

D)   1000

View Answer:

Answer: Option A

Solution:

37. A SONET system can use _________.

A)   regenerators

B)   add/drop multiplexers

C)   STS multiplexers

D)   all of the above

View Answer:

Answer: Option D

Solution:

38. In ________APS, there is only one protection line for many working lines. When a failure occurs in one of the working lines, the protection line takes control until the failed line is repaired.

A)   one-to-one

B)   one-plus-one

C)   one-to-many

D)   none of the above

View Answer:

Answer: Option C

Solution:

39. The section overhead consists of ______octets.

A)   18

B)   9

C)   6

D)   1

View Answer:

Answer: Option B

Solution:

Complete List of Chapter Quiz in Data Communications and Networking

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Forouzan: MCQ in SONET / SDH
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