A security tester needs to verify if a remote port that relies on a handshake is open. Which technique is the best for confirming that the service is active?
A broadcast-based method that checks for responses from all devices
A sequence that sends a partial request and interprets an unreachable message as a closed port
A minimal approach that avoids handshake signals and times out to identify open ports
An approach that completes all steps in the connection sequence to confirm the service is active
Completing all aspects of the connection sequence verifies that the service truly accepts inbound requests. A partial request that waits for an unreachable message does not confirm whether the service actually accepts the connection. Broadcast queries locate responding devices but do not validate handshake-based ports. A minimal approach that times out can identify suspects but does not confirm a handshake.
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Why is completing all steps in the connection sequence the best approach for confirming a handshake-based service is active?
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What is a handshake in networking?
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How does a broadcast-based method differ, and why is it not suitable for handshake verification?