Which TCP flag sequence is used by the client to initiate a connection?

Which TCP flag sequence is used by the client to initiate a connection?

• A. SYN
• B. ACK
• C. FIN
• D. PSH

Answer: (A)

Establishing a TCP connection relies on a three-way handshake. The client starts this process by sending a segment with the SYN flag set, signaling a request to synchronize sequence numbers and open the connection. The server then replies with a segment that has SYN and ACK set, acknowledging the request and providing its own sequence number, followed by the client sending a final segment with the ACK flag to complete the handshake. So, the flag sequence that initiates the connection is SYN. The other flags have different roles: ACK confirms receipt, FIN begins the connection termination, and PSH indicates data should be sent promptly.

Establishing a TCP connection relies on a three-way handshake. The client starts this process by sending a segment with the SYN flag set, signaling a request to synchronize sequence numbers and open the connection. The server then replies with a segment that has SYN and ACK set, acknowledging the request and providing its own sequence number, followed by the client sending a final segment with the ACK flag to complete the handshake. So, the flag sequence that initiates the connection is SYN. The other flags have different roles: ACK confirms receipt, FIN begins the connection termination, and PSH indicates data should be sent promptly.