A security consultant is examining a server that blocks standard connection attempts. The consultant wants to confirm open ports by sending partial requests that elicit acknowledgment without completing a full exchange. Which scanning approach accomplishes this goal?
The scanning approach uses an initial request without establishing the entire three-way handshake. When an open port receives the partial request, it sends an acknowledgment, which indicates the port is active. Approaches relying on different flags do not receive the same direct confirmation. The three-way handshake approach fails if filters prevent the final exchange. FIN-based or other flag-based approaches can confuse some targets or not elicit the needed response.
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What is the SYN half-open method?
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What is the TCP three-way handshake?
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Why is the SYN half-open method preferred over the FIN-based method for port scanning?