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Homework 3 solution

# Homework 3 solution - Problem 1 a)23-1=7 size of window for...

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Problem 1- a)2 3 -1=7 size of window for Go-back-N Size of window at receiver = 1 b) 2 3-1 =4 size of window for SR Size of window at receiver = 4

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Problem 2- a)7 is the max size of window for Go-back-N => 3 seq. bits Size of window at receiver = 1

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b) Max size of window for SR cannot be higher than 8 => 4 seq. bits Concept of this diagram is similar to the previous diagram and it is not shown here.
Problem 3-a)B2(2) B2(3) B2(4) B1(1) B1(2) B1(3) H1(1) H1(2) B1 B2 A 1 A 4 a)B2(2) B2(3) B2(1) B1(1) B1(4) B1(3) H1(3) H1(2) B1 B2 A 1 E 4 A 4 E 2 c)B2(2) B2(3) B2(1) B1(1) B1(4) B1(3) H1(1) H1(3) B1 B2 A 1 E 4 H 4 A 4 E 2 H 2 d)B1(4) B2(1) B1 B2 A 1 E 4 H 4 G 4 A 4 E 2 H 2 G 3 e) B2(1) B2(2) B2(3) B1(2) B1(3) B1(4) H1(1) H1(2) B1 B2 A 1 E 4 H 4 G 4 D 4 A 4 E 2 H 2 G 3 D 1 f) B2(1) B2(3) B2(4) B1(1) B1(2) B1(3) H1(1) H1(2) B1 B2 A 1 E 4 H 4 G 4 D 4 B 2 A 4 E 2 H 2 G 3 D 1 B 4

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Problem 4- 0 to 6 frames are sent => Ack 3 Then frame 3 to 15 (2 4 -1) and then frame 0 to 1 are sent and because of no ack => timeout => start again from 3. After timeout frame 3 to 14 are sent and then Ack 13 is received after RTT after frame 14. Diagram is not shown in this solution.

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