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Author(s) Louis Navarre
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Guessing sequence numbers of data packets

Consider the following time-sequence diagram of a protocol whose acknowledgment number corresponds to the last-received sequence number.

https://inginious.org/course/cnp3-hackathon/guessing-sequence-number/guessing-sequence-number.png
You observe that the sequence number X of the first message is , and the different data A "" B "" C "".

Question 1: Message-mode service 1

If the connection provides a message-mode service, what is the sequence number of the second message Y?

Question 2: Message-mode service 2

If the connection provides a message-mode service, what is the sequence number of the third message Z?

Question 3: Stream-mode service 1

If the connection provides a stream-mode service, what is the sequence number of the second message Y?

Question 4: Stream-mode service 2

If the connection provides a stream-mode service, what is the sequence number of the third message Z?