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#
Authors:
James F. Kurose, Keith W. Ross
Chapter:
Transport Layer
Exercise:
Problems
Question:22 | ISBN:9780132856201 | Edition: 6

Question

Consider the GBN protocol with a sender window size of 4 and a sequence number range of 1,024. Suppose that at time t, the next in-order packet that the receiver is expecting has a sequence number of k. Assume that the medium does not reorder messages.

Answer the following questions:

a. What are the possible sets of sequence numbers inside the sender’s win- dow at time t? Justify your answer.

b. What are all possible values of the ACK field in all possible messages cur- rently propagating back to the sender at time t? Justify your answer.

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