SYN-ACK can be best described as the second part of a three-way TCP handshake sent in response to a SYN.

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SYN-ACK is indeed the second part of a three-way TCP handshake sent in response to a SYN. After the sender (client) sends a SYN packet to the receiver (server), the receiver responds with a SYN-ACK packet to acknowledge the SYN and initiate a connection. The third part of the handshake is a final ACK packet from the sender to confirm the connection establishment.

SYN-ACK Can Be Best Described as the Second Part of a Three-Way