Author(s) Quentin De Coninck
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Principles of the connection establishment

Consider the following time-sequence diagram of a protocol whose acknowledgment number corresponds to the last-received sequence number. This protocol relies on CR message to initiate a connection, and CA messages to complete the three-way handshake.
You note that the second message is CA(seq=,ack=).

Question 1: The first message

What is the first message? Your answer should be similar to CR(seq=1234).

Question 2: The third message

What is the third message? Your answer should be similar to CA(seq=1234,ack=5678).