CompTIA
SY0-301 · Question #604
SY0-301 Question #604: Real Exam Question with Answer & Explanation
The correct answer is B: ACK. The TCP three-way handshake that establishes a connection uses the SYN and ACK flags across its three steps.
Question
Which the following flags are used to establish a TCP connection? (Select TWO).
Options
- APSH
- BACK
- CSYN
- DURG
- EFIN
Explanation
The TCP three-way handshake that establishes a connection uses the SYN and ACK flags across its three steps.
Common mistakes.
- A. PSH (Push) is used to instruct the receiver to pass buffered data to the application immediately and is not part of connection establishment.
- D. URG (Urgent) signals that certain data should be prioritized but plays no role in the TCP three-way handshake.
- E. FIN is used to gracefully terminate an established connection, not to establish one.
Concept tested. TCP three-way handshake SYN and ACK flags
Reference. https://www.ietf.org/rfc/rfc793.txt
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