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You are sending two segments, A has 80 bytes and B has 40 bytes. Assume cumulative...

You are sending two segments, A has 80 bytes and B has 40 bytes. Assume

cumulative acknowledgments, up to 127. What will be the new acknowledgment

number if B arrives first?

a. 167

b. 128

c. 127

d. 207

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Answer #1

The acknowledgment number is the sequence number of the next byte the receiver expects to receive. The answer will depend on the sequence numbers of A and B.

Cumulative acknowledgment 127 means all bytes before 127 are received and the receiver is expecting bytes starting from 127. Now if we assume that A has sequence number 127 and B has sequence number 127 + 80 = 207, then if B is received first then the acknowledgment number will be again 127. And the answer would be (c). That is because the receiver ack' ing sequence number x acknowledges receipt of all data bytes less than (but not including) byte number x.

However, if B has a sequence number of 127, then the new acknowledge number is going to be 127 + 40 = 167. In that case answer (a) would be correct.

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