Practice Exam Test Questions
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
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)
Answer: Option C
Solution:
3. The path overhead consists of ______ bytes.
A) 18
B) 9
C) 6
D) 1
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)
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
Answer: Option A
Solution:
6. A ________ is a repeater.
A) ADM
B) regenerator
C) STS multiplexer/demultiplexer
D) none of the above
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
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
Answer: Option A
Solution:
9. Line overhead consists of ________ bytes.
A) 18
B) 9
C) 6
D) 1
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
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
Answer: Option C
Solution:
12. An STS-1 frame is made ______columns.
A) 90
B) 9
C) 1
D) none of the above
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
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
Answer: Option A
Solution:
15. An STS multiplexer is a ______ device.
A) four-layer
B) three-layer
C) two-layer
D) one-layer
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)
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)
Answer: Option B
Solution:
18. An add/drop multiplexer is a ______ device.
A) four-layer
B) three-layer
C) two-layer
D) one-layer
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
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
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
Answer: Option B
Solution:
22. The _______ layer corresponds to the physical layer of the OSI model.
A) photonic
B) path
C) line
D) section
Answer: Option A
Solution:
23. SONET is a _______ TDM system.
A) statistical
B) asynchronous
C) synchronous
D) none of the above
Answer: Option C
Solution:
24. An STS-3 frame is made of ______ rows.
A) 27
B) 9
C) 1
D) none of the above
Answer: Option B
Solution:
25. SONET defines _______ layers.
A) five
B) four
C) three
D) two
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
Answer: Option C
Solution:
27. __________ allow insertion and extraction of signals.
A) STS multiplexer/demultiplexers
B) regenerators
C) ADMs
D) none of the above
Answer: Option C
Solution:
28. An STS-3 frame is made of ________ columns.
A) 270
B) 90
C) 9
D) none of the above
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)
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
Answer: Option B
Solution:
31. A regenerator is a ________ device.
A) three-layer
B) one-layer
C) two-layer
D) four-layer
Answer: Option C
Solution:
32. An STS-1 frame is made of ________ rows
A) 90
B) 9
C) 1
D) none of the above
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)
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
Answer: Option A
Solution:
35. SONET network topologies can be __________.
A) ring
B) mesh
C) linear
D) all of the above
Answer: Option D
Solution:
36. SONET sends ________ frames per second.
A) 8000
B) 4000
C) 2000
D) 1000
Answer: Option A
Solution:
37. A SONET system can use _________.
A) regenerators
B) add/drop multiplexers
C) STS multiplexers
D) all of the above
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
Answer: Option C
Solution:
39. The section overhead consists of ______octets.
A) 18
B) 9
C) 6
D) 1
Answer: Option B
Solution:
Complete List of Chapter Quiz in Data Communications and Networking
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MCQ in SONET - SDH (pdf)
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