Which scan uses FIN, PSH, and URG flags for probing and is known as a Fin scan?

Which scan uses FIN, PSH, and URG flags for probing and is known as a Fin scan?

• A. -sF
• B. -sX
• C. -sA
• D. -sI

Answer: (A)

A Fin scan is all about probing ports by sending a packet with the FIN flag set and no others. In TCP, open ports typically don’t respond to a FIN probe, while closed ports reply with a RST, so you can infer port state without completing a connection. That’s why this scanning method is labeled as a Fin scan in Nmap, corresponding to the option that performs a FIN-flag probe. The combination of FIN, PSH, and URG flags describes a different technique known as an Xmas scan, which is a separate probe method used for fingerprinting and evasion. Other scans, like those using different flag sets for ACK or idle scanning, follow their own probing rules and don’t match the Fin scan behavior.

A Fin scan is all about probing ports by sending a packet with the FIN flag set and no others. In TCP, open ports typically don’t respond to a FIN probe, while closed ports reply with a RST, so you can infer port state without completing a connection. That’s why this scanning method is labeled as a Fin scan in Nmap, corresponding to the option that performs a FIN-flag probe.

The combination of FIN, PSH, and URG flags describes a different technique known as an Xmas scan, which is a separate probe method used for fingerprinting and evasion. Other scans, like those using different flag sets for ACK or idle scanning, follow their own probing rules and don’t match the Fin scan behavior.