This set of Data communication and Networking Multiple Choice Questions and Answers (MCQs) focuses on “Data Link Layer – Data Link Control – Flow Control ”.
1. In the sliding window method of flow control, the receiver window _______ size when frames are received
- increases in
- decreases in
- doubles in
- remains its original
B. decreases in
2. In the sliding window method of flow control, the receiver window _______ size when an ACK is sent
- increases in
- decreases in
- doubles in
- remains its original
A. increases in
3. A sender has a sliding window of size 15. The first 15 frames are sent. The first ACK received is ACK 15. What frame(s) has the receiver accepted?
- frame 15
- frame 14
- frames 0 to 15
- frames 0 to 14
D. frames 0 to 14
4. A sender has a sliding window of size 15. The first 15 frames are sent. The first ACK received is ACK 15. What frame is the receiver expecting?
- frame 14
- frame 15
- frame 16
- frame 0
B. frame 15
5. A sender has a sliding window of size 15. The first 15 frames are sent. How many frames are in the window now?
- 0
- 1
- 14
- 15
A. 0
6. A sender has a sliding window of size 15. The first 10 frames are sent. How many frames are in the window now?
- 4
- 5
- 6
- 10
B. 5
7. A sender has a sliding window of size 15. The first 15 frames are sent. The receiver receives 10 frames. How many frames can the receiver still receive?
- 1
- 5
- 6
- 15
B. 5
8. A sender has a sliding window of size 15. The first 15 frames are sent. The receiver sends an ACK 10. How many spaces does the receiver window expand?
- 5
- 9
- 10
- 15
C. 10
9. A sender has a sliding window of size 15. The first 15 frames are sent. The receiver sends an ACK 10 and expands its window. What is the size of the receiver window now?
- 5
- 9
- 10
- 15
D. 15
10. The receiver's window in a sliding window protocol expands when _______.
- an ACK is received
- an ACK is sent
- a frame is sent
- a frame is received
B. an ACK is sent
11. The sender's window in a sliding window protocol expands when _______.
- an ACK is received
- an ACK is sent
- a frame is sent
- a frame is received
A. an ACK is received
12. The stop-and-wait flow control method is the same as the sliding window method with a window size of _______.
- 0
- 1
- 2
- none of the above
B. 1
13. Flow control is mainly a function of the _______ layer
- application
- presentation
- session
- data link
D. data link
14. _______ is the regulation of the amount of data that can be sent.
- Line discipline
- Flow control
- Error control
- All of the above
B. Flow control
15. Which data link layer function answers the question: How much data may be sent?
- line discipline
- flow control
- error control
- session management
B. flow control
16. Stop-and-wait is a _______ technique
- line discipline
- flow control
- error control
- session management
B. flow control
17. Sliding window is a _______ technique
- line discipline
- flow control
- error control
- session management
B. flow control
18. In the stop-and-wait method of flow control, the sender sends _______ at a time
- a variable number of frames
- only one frame
- a set number of frames
- two frames
B. only one frame
19. In the sliding window method of flow control, the sender may send _______ at a time.
- several frames
- only one frame
- a set number of frames
- two frames
A. several frames
20. In the stop-and-wait method of flow control, after the receiver receives a data frame, _______ frame can be sent
- an ACK
- a NAK
- an EOT
- a or b
D. a or b
21. What is the main disadvantage of stop-and-wait flow control?
- unreliable
- inefficient
- attenuation
- dropped packets
B. inefficient
22. In the stop-and-wait method of flow control, if 100 good data frames are sent and received, how many ACK frames have been sent by the receiver?
- 99
- 100
- 101
- 200
B. 100
23. In the sliding window method of flow control, if 100 good data frames are sent and received, how many ACK frames have been sent by the receiver?
- 99
- 100
- 101
- some number less than or equal to 100
D. some number less than or equal to 100
24. In the sliding window method of flow control, if the frame numbers range from 0 to 31, the size of the window is _______ frames.
- 16
- 31
- 32
- 33
B. 31
25. In the sliding window method of flow control, if the frame numbers range from 0 to 63, the size of the window is _______ frames.
- 32
- 63
- 64
- 65
B. 63
26. In the sliding window method of flow control, the sender window _______ size when frames are sent.
- increases in
- decreases in
- expands in
- remains its original
B. decreases in
27. In the sliding window method of flow control, the sender window _______ size when an ACK is received.
- increases in
- decreases in
- doubles in
- remains its original
A. increases in