Practice Exam Test Questions
Choose the letter of the best answer in each questions.
1. In Go-Back-N ARQ, if 5 is the number of bits for the sequence number, then the maximum size of the receive window must be _______.
A) 1
B) 15
C) 16
D) 31
Answer: Option A
Solution:
2. In Go-Back-N ARQ, if frames 4, 5, and 6 are received successfully, the receiver may send an ACK _______ to the sender.
A) 6
B) 7
C) 5
D) any of the above
Answer: Option B
Solution:
3. The Stop-And-Wait ARQ, Go-Back-N ARQ, and the Selective Repeat ARQ are for ______ channels.
A) noiseless
B) noisy
C) either (a) or (b)
D) neither (a) nor (b)
Answer: Option B
Solution:
4. The _________Protocol, adds a simple error control mechanism to the _______Protocol.
A) Selective Repeat ARQ; Go-Back-N ARQ
B) Go-Back-N ARQ; Stop-and-Wait
C) Stop-and-Wait ARQ; Stop-and-Wait
D) none of the above
Answer: Option C
Solution:
5. In PPP, the ________ is responsible for establishing, maintaining, configuring, and terminating links.
A) PAP
B) CHAP
C) LCP
D) NCP
Answer: Option C
Solution:
6. HDLC is an acronym for _______.
A) Half-duplex digital link combination
B) Host double-level circuit
C) High-duplex line communication
D) High-level data link control
Answer: Option D
Solution:
7. In Selective Repeat ARQ, if 5 is the number of bits for the sequence number, then the maximum size of the receive window must be _____.
A) 1
B) 15
C) 16
D) 31
Answer: Option C
Solution:
8. In Go-Back-N ARQ, if 5 is the number of bits for the sequence number, then the maximum size of the send window must be _____.
A) 1
B) 15
C) 16
D) 31
Answer: Option D
Solution:
9. In Stop-and-Wait ARQ, the acknowledgment number always announces in ______ arithmetic the sequence number of the next frame expected.
A) modulo-m
B) modulo-2
C) modulo-4
D) none of the above
Answer: Option B
Solution:
10. In Selective Repeat ARQ, if 5 is the number of bits for the sequence number, then the maximum size of the send window must be _____.
A) 1
B) 15
C) 16
D) 31
Answer: Option C
Solution:
11. _______ control refers to a set of procedures used to restrict the amount of data that the sender can send before waiting for acknowledgment.
A) Flow
B) Error
C) Transmission
D) none of the above
Answer: Option A
Solution:
12. In the Go-Back-N Protocol, if the size of the sequence number field is 8, the sequence numbers are in ________ arithmetic,
A) modulo-256
B) modulo- 8
C) modulo-2
D) none of the above
Answer: Option A
Solution:
13. ______ control refers to methods of error detection and correction.
A) Flow
B) Error
C) Transmission
D) none of the above
Answer: Option B
Solution:
14. In a Go-Back-N ARQ, if the window size is 63, what is the range of sequence numbers?
A) 1 to 63
B) 1 to 64
C) 0 to 63
D) 0 to 64
Answer: Option C
Solution:
15. Both Go-Back-N and Selective-Repeat Protocols use a _________.
A) sliding window
B) sliding frame
C) sliding packet
D) none of the above
Answer: Option A
Solution:
16. In _________, the configuration is balanced. The link is point-to-point, and each station can function as a primary and a secondary.
A) ARM
B) ABM
C) NBM
D) NRM
Answer: Option B
Solution:
17. Byte stuffing means adding a special byte to the data section of the frame when there is a character with the same pattern as the ______.
A) trailer
B) flag
C) header
D) none of the above
Answer: Option B
Solution:
18. The ______ Protocol has neither flow nor error control.
A) Selective-Repeat ARQ
B) Go-Back-N ARQ
C) Stop-and-Wait
D) Simplest
Answer: Option D
Solution:
19. The most common protocol for point-to-point access is the Point-to-Point Protocol (PPP), which is a _________protocol.
A) byte-oriented
B) bit-oriented
C) character-oriented
D) none of the above
Answer: Option A
Solution:
20. For Stop-and-Wait ARQ, for 10 data packets sent, _______ acknowledgments are needed.
A) less than 10
B) more than 10
C) exactly 10
D) none of the above
Answer: Option C
Solution:
21. _________framing uses two categories of protocols: character-oriented and bit-oriented.
A) Standard
B) Fixed-size
C) Variable-size
D) None of the above
Answer: Option C
Solution:
22. _______ control refers to a set of procedures used to restrict the amount of data that the sender can send before waiting for acknowledgment.
A) Flow
B) Error
C) Transmission
D) none of the above
Answer: Option A
Solution:
23. In a ________ protocol, the data section of a frame is a sequence of characters.
A) bit-oriented
B) character-oriented
C) either (a) or (b)
D) none of the above
Answer: Option B
Solution:
24. In _______ framing, there is no need for defining the boundaries of frames.
A) standard
B) fixed-size
C) variable-size
D) none of the above
Answer: Option B
Solution:
25. The _______Protocol has both flow control and error control.
A) Stop-and-Wait
B) Selective-Repeat ARQ
C) Go-Back-N ARQ
D) both (b) and (c)
Answer: Option D
Solution:
26. In _________, the station configuration is unbalanced. We have one primary station and multiple secondary stations.
A) ARM
B) NBM
C) NRM
D) ABM
Answer: Option C
Solution:
27. In a _________ protocol, the data section of a frame is a sequence of bits.
A) bit-oriented
B) byte-oriented
C) either (a) or (b)
D) none of the above
Answer: Option A
Solution:
28. In ________ framing, we need a delimiter (flag) to define the boundary of two frames.
A) standard
B) fixed-size
C) variable-size
D) none of the above
Answer: Option C
Solution:
29. High-level Data Link Control (HDLC) is a _______ protocol for communication over point-to-point and multipoint links.
A) byte-oriented
B) bit-oriented
C) character-oriented
D) none of the above
Answer: Option B
Solution:
30. Bit stuffing means adding an extra 0 to the data section of the frame when there is a sequence of bits with the same pattern as the ________.
A) trailer
B) flag
C) header
D) none of the above
Answer: Option B
Solution:
31. In the _________Protocol, if no acknowledgment for a frame has arrived, we resend all outstanding frames.
A) Go-Back-N ARQ
B) Selective-Repeat ARQ
C) Stop-and-Wait ARQ
D) none of the above
Answer: Option A
Solution:
32. The Simplest Protocol and the Stop-and-Wait Protocol are for ______ channels.
A) noiseless
B) noisy
C) either (a) or (b)
D) neither (a) nor (b)
Answer: Option A
Solution:
33. The _______Protocol has flow control, but not error control.
A) Selective-Repeat ARQ
B) Stop-and-Wait
C) Simplest
D) Go-Back-N ARQ
Answer: Option B
Solution:
34. In Stop-and-Wait ARQ, we use sequence numbers to number the frames. The sequence numbers are based on __________arithmetic.
A) modulo-m
B) modulo-2
C) modulo-4
D) none of the above
Answer: Option B
Solution:
35. In the _____ Protocol, the sender sends its frames one after another with no regard to the receiver.
A) Simplest
B) Selective-Repeat ARQ
C) Stop-and-Wait
D) Go-Back-N ARQ
Answer: Option A
Solution:
36. _________control in the data link layer is based on automatic repeat request, which is the retransmission of data.
A) Flow
B) Error
C) Transmission
D) none of the above
Answer: Option B
Solution:
37. In PPP, _______ is a three-way hand-shaking authentication protocol in which the password is kept secret; it is never sent online.
A) PAP
B) LCP
C) NCP
D) CHAP
Answer: Option D
Solution:
38. In PPP, ________ is a simple authentication procedure with a two-step process:
A) CHAP
B) PAP
C) LCP
D) NCP
Answer: Option B
Solution:
39. In the _________ protocol we avoid unnecessary transmission by sending only frames that are corrupted.
A) Selective-Repeat ARQ
B) Stop-and-Wait ARQ
C) Go-Back-N ARQ
D) none of the above
Answer: Option A
Solution:
40. In ________ protocols, we use ________.
A) byte-oriented; bit stuffing
B) bit-oriented; bit stuffing
C) character-oriented; bit stuffing
D) none of the above
Answer: Option B
Solution:
41. In the _____ Protocol, the sender sends one frame, stops until it receives confirmation from the receiver, and then sends the next frame.
A) Simplest
B) Stop-and-Wait
C) Selective-Repeat ARQ
D) Go-Back-N ARQ
Answer: Option B
Solution:
42. Stop-and-Wait ARQ is a special case of Go-Back-N ARQ in which the size of the send window is ___.
A) 1
B) 2
C) 8
D) none of the above
Answer: Option A
Solution:
43. ARQ stands for _______.
A) Acknowledge repeat request
B) Automatic retransmission request
C) Automatic repeat quantization
D) Automatic repeat request
Answer: Option D
Solution:
44. _______ in the data link layer separates a message from one source to a destination, or from other messages going from other sources to other destinations.
A) Controlling
B) Framing
C) Digitizing
D) none of the above
Answer: Option B
Solution:
45. Data link control deals with the design and procedures for ______ communication.
A) node-to-node
B) process-to-process
C) host-to-host
D) none of the above
Answer: Option A
Solution:
46. In _________ protocols, we use ________.
A) bit-oriented; character stuffing
B) character-oriented; bit stuffing
C) character-oriented; byte stuffing
D) none of the above
Answer: Option C
Solution:
NEXT: MCQ in Multiple Access
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