Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN: 9780133594140
Author: James Kurose, Keith Ross
Publisher: PEARSON
Expert Solution & Answer
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Chapter 3, Problem P22P

a.

Explanation of Solution

Sequence numbers inside the sender’s window:

Given:

Window size = Size = 4

Range = 1024

Case 1:

Let’s consider the receiver is “K” and acknowledged all the “k-1” data packets. The sender side window’s range will be of [ k , k+ Size - 1 ]  sequence numbers

b.

Explanation of Solution

Values of ACK field:

Suppose the receiver is waiting for the packet “k”, then it has been received and acknowledged “k-1” packet and the “Size-1” packets before that. If NACKs of those packets have not been received by the sender, then the values of ACK field is [ k - size , k - 1 ] may propagate back.

  • Because the sender has sent packets k - 1, it states that the sender had already received an acknowledgement for k - Size -1

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