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I have doubt

1: Segment sequence number is  equal to the first sequence number of byte in TCP  . Is it right ?

1 Answer

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Yes thats right. The SEQ no is equal to the SEQUENCE NO of first byte of segment. eg- If there is segment 1 is of 4 bytes and immediately after that we have segment 2 of 8 bytes and after that segment 3 of 5 bytes, then (assuming from 0) the SEQUENCE NO of segment 1 becomes 0. The SEQUENCE NO of segment 2 becomes 4 and SEQUENCE NUMBER of segment 3 becomes 12.

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