TCP Header

Posted by AJ × 10:39

TCP segment structure

Seq. numbers:

– byte stream “number” of first byte in segment’s data

ACKs:

– seq numbers of next byte expected from other side

– cumulative ACK

Q: how receiver handles out-of-order segments

– A: TCP spec doesn’t say, - up to implementor

Every segment of TCP has a sequence number so it is easy to reassemble and also take

care of the loss of packet and retransmission is done

The segment details are shown below

The SYN bit used for connection setup and the FIN bit for the release

Urgent data means it has to be delivered faster which indicate by the pointer

The Checksum uses CRC

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