A consultant detects several unexpected open ports on a test server that display vague banners when probed. Which scanning technique is most likely to discover the actual software listening on these ports?
FIN scanning
Null scanning
Version scanning
Xmas scanning
Version scanning engages with a port by sending probes and analyzing responses. This reveals details such as the software or service running and sometimes version information. Approaches like Null and Xmas scanning help determine whether ports are open or closed and can assist with certain types of firewall circumvention. FIN scanning turns up similar information about port states but does not typically return enough data identifying the software behind the port.
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