Suppose you attach a network monitor to observe the sequence of frames that travel over a link from sender A to receiver B. The problem is to deduce what protocols, if any, could have generated the observed sequence. The following diagrams depict a flow of frames, with their corresponding sequence numbers, from the sender (A). There may be traffic from B to A, which is not depicted in the diagram. A gap between adjacent frames implies passage of time with no transmission from the sender. Note that the x-axis is time, and not space. Justify your answer. A A A A ● ● ● ● 1 5 ● 3 5 ● 0 0 0 1 1 1 1 0 5 0 c) For Diagram 3, the protocol is not: Stop-and-Wait Go-Back-N ● Selective Repeat Time Diagram 1 2 Time Diagram 2 Time a) For Diagram 1, the most likely protocol being used is: ● Stop-and-Wait Go-Back-N (if Go-Back-N, give the window size) Selective Repeat (if Selective Repeat, give the window size) 3 Diagram 3 1 Time b) For Diagram 2, the most likely protocol being used is: (Justify your answer) ● Stop-and-Wait Go-Back-N (if Go-Back-N, give the window size) Selective Repeat (if Selective Repeat, give the window size) 2 Diagram 4 (Justify your answer) (Justify your answer) d) For Diagram 4, the most likely protocol being used is: Stop-and-Wait Go-Back-N (if Go-Back-N, give the window size) Selective Repeat (if Selective Repeat give the window size) (Justify your answer)
Suppose you attach a network monitor to observe the sequence of frames that travel over a link from sender A to receiver B. The problem is to deduce what protocols, if any, could have generated the observed sequence. The following diagrams depict a flow of frames, with their corresponding sequence numbers, from the sender (A). There may be traffic from B to A, which is not depicted in the diagram. A gap between adjacent frames implies passage of time with no transmission from the sender. Note that the x-axis is time, and not space. Justify your answer. A A A A ● ● ● ● 1 5 ● 3 5 ● 0 0 0 1 1 1 1 0 5 0 c) For Diagram 3, the protocol is not: Stop-and-Wait Go-Back-N ● Selective Repeat Time Diagram 1 2 Time Diagram 2 Time a) For Diagram 1, the most likely protocol being used is: ● Stop-and-Wait Go-Back-N (if Go-Back-N, give the window size) Selective Repeat (if Selective Repeat, give the window size) 3 Diagram 3 1 Time b) For Diagram 2, the most likely protocol being used is: (Justify your answer) ● Stop-and-Wait Go-Back-N (if Go-Back-N, give the window size) Selective Repeat (if Selective Repeat, give the window size) 2 Diagram 4 (Justify your answer) (Justify your answer) d) For Diagram 4, the most likely protocol being used is: Stop-and-Wait Go-Back-N (if Go-Back-N, give the window size) Selective Repeat (if Selective Repeat give the window size) (Justify your answer)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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Transcribed Image Text:Question 5:
Suppose you attach a network monitor to observe the sequence of frames that travel over a
link from sender A to receiver B. The problem is to deduce what protocols, if any, could have
generated the observed sequence. The following diagrams depict a flow of frames, with their
corresponding sequence numbers, from the sender (A). There may be traffic from B to A,
which is not depicted in the diagram. A gap between adjacent frames implies passage of time
with no transmission from the sender.
Note that the x-axis is time, and not space.
Justify your answer.
A
A
A
●
●
●
●
1
5
●
3
5
0
●
0
0
1
1
1
● Go-Back-N
● Selective Repeat
1
0
5
0
c) For Diagram 3, the protocol is not:
Stop-and-Wait
Time
Diagram 1
2
Time
a) For Diagram 1, the most likely protocol being used is:
Stop-and-Wait
● Go-Back-N (if Go-Back-N, give the window size)
Selective Repeat (if Selective Repeat, give the window size)
Diagram 2
Time
3
Diagram 3
1
Time
b) For Diagram 2, the most likely protocol being used is: (Justify your answer)
Stop-and-Wait
Go-Back-N (if Go-Back-N, give the window size)
Selective Repeat (if Selective Repeat, give the window size)
2
Diagram 4
(Justify your answer)
(Justify your answer)
d) For Diagram 4, the most likely protocol being used is:
Stop-and-Wait
Go-Back-N (if Go-Back-N, give the window size)
Selective Repeat (if Selective Repeat, give the window size)
(Justify your answer)
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