Certified Ethical Hacker (CEH v11) — Question 168

The establishment of a TCP connection involves a negotiation called three-way handshake. What type of message does the client send to the server in order to begin this negotiation?

Answer options

• A. ACK
• B. SYN
• C. RST
• D. SYN-ACK

Correct answer: B

Explanation

The correct answer is B, as the client begins the three-way handshake by sending a SYN message to the server to request a connection. Option A, ACK, is sent in later stages of the handshake, while option C, RST, is used to reset a connection and option D, SYN-ACK, is the server's response to the SYN message, not the initial message from the client.