Testbook Test Series: Computer Networks - Tcp

Question

Which of the following is TRUE

1. A SYN segment can carry data,consumes no sequence number

2. A SYN+ACK segment can't carry data,but does consume one sequence number

3. An ACK segment , if carrying no data doesn't consume a sequence number 

Comments

@ srestha

No..during connection establishment phase:- 3rd step of handshake .it will be pure ack with no data consuming no sequence number..but later during data transfer it can be piggybacked consuming sequence numbers ..m I right?

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Yess jatin khachane 1

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answer  is 2 and 3 is true.because client sends the first segment SYN in which only SYN flag is set.SYN is control segment and caries no data.other side receiver sends segment SYN+ACK segment with two flag bits set.server acknowledge client by sending ACK flag.

Answer 1

Option ii, and iii both are true.

• SYN FALG(request ) Consume one sequence number . But not carry data .
• ACK FLAG dosent consume sequence number and data .
• SYN +ACK (reply)consume one sequence number . But not carry data .