TCP Three-Way Handshake
SYN, SYN-ACK, ACK: each side picks a random initial sequence number and acknowledges the other's, so both ends agree on numbering before data flows. Options in the SYN negotiate MSS, window scaling, and SACK for the connection's lifetime.
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SYN, SYN-ACK, ACK: each side picks a random initial sequence number and acknowledges the other's, so both ends agree on numbering before data flows. Options in the SYN negotiate MSS, window scaling, and SACK for the connection's lifetime.
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