(ISC)2 Certified in Cybersecurity Practice Exam

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At what stage of the TCP Threeway Handshake is the request to connect generated?

A) ACK
B) SYN/ACK
C) SYN
D) FIN

The correct answer is: C) SYN

The request to connect in the TCP threeway handshake is generated during the SYN stage. In this initial step, a client wanting to establish a connection sends a SYN (synchronize) packet to the server. This packet indicates that the client is requesting to open a communication channel with the server and includes an initial sequence number. This stage is critical because it initiates the connection process. Upon receiving the SYN packet, the server responds with a SYN/ACK packet, confirming the receipt of the SYN and acknowledging the request to connect. However, the actual generation of that connection request occurs specifically in the SYN stage, making it the point where the handshake begins. To clarify the other options: the ACK stage is part of the acknowledgment process after both sides have exchanged initial SYN and SYN/ACK packets. The SYN/ACK stage is a response from the server to the client indicating it's ready to proceed. The FIN stage is for closing a connection and not involved in the initiation of a new one. Thus, the SYN stage is the correct and definitive answer for where the connection request is generated.