This set of Data communication and Networking Multiple Choice Questions and Answers (MCQs) focuses on “Data Link Layer – Data Link Control – Flow Control ”.

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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

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

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

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

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

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

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

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

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

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

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

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

13. Flow control is mainly a function of the _______ layer

  • application
  • presentation
  • session
  • 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
  • line discipline
  • flow control
  • error control
  • session management

16. Stop-and-wait is a _______ technique

  • line discipline
  • flow control
  • error control
  • session management

17. Sliding window is a _______ technique

  • line discipline
  • flow control
  • error control
  • session management

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

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

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

21. What is the main disadvantage of stop-and-wait flow control?

  • unreliable
  • inefficient
  • attenuation
  • dropped packets

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

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

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

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

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

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
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