Question: When TCP sends a {SYN, SequenceNum = x} or {FIN, SequenceNum = x}, the consequent ACK has Acknowledgment = x +1; that is, SYNs and

When TCP sends a {SYN, SequenceNum = x} or {FIN, SequenceNum =

x}, the consequent ACK has Acknowledgment = x +1; that is, SYNs and FINs each take up one unit in sequence number space. Is this necessary? If so, give an example of an ambiguity that would arise if the corresponding Acknowledgment were x instead of x +1; if not, explain why.

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