EC-Council
312-50V9 · Question #300
312-50V9 Question #300: Real Exam Question with Answer & Explanation
The correct answer is D: SYN. The TCP 3-way handshake begins when the client sends a SYN segment to signal its intent to establish a connection and share its initial sequence number.
Question
The establishment of a TCP connection involves a negotiation called 3 way handshake. What type of message sends the client to the server in order to begin this negotiation?
Options
- ARST
- BACK
- CSYN-ACK
- DSYN
Explanation
The TCP 3-way handshake begins when the client sends a SYN segment to signal its intent to establish a connection and share its initial sequence number.
Common mistakes.
- A. RST (reset) is used to abruptly terminate an existing or invalid connection, not to initiate one.
- B. ACK (acknowledge) confirms receipt of data and is the third and final step of the handshake, not the initiating step.
- C. SYN-ACK is the server's second-step response to the client's initial SYN, not the message that begins the negotiation.
Concept tested. TCP 3-way handshake connection initiation
Reference. https://www.rfc-editor.org/rfc/rfc793
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