Which option specifies a TCP Ping to ports 100 and 90?

Which option specifies a TCP Ping to ports 100 and 90?

• A. -PT100,90
• B. -PA100,90
• C. -PR
• D. -oN

Answer: (A)

TCP Ping is a host-discovery method that sends a TCP probe to a specific port to see if the host answers, without completing a full TCP handshake. The -PT switch selects this TCP Ping type, and the ports that follow tell Nmap which destinations to probe. So -PT100,90 specifically instructs Nmap to perform a TCP Ping to ports 100 and 90 on the target. That combination is exactly how you indicate a TCP Ping to particular ports. Other switches change the ping type or the discovery method. For example, a TCP ACK ping uses a different flag, not the plain TCP Ping, and ARP-based probing uses -PR, which is a distinct approach suitable for local networks. The -oN option, on the other hand, controls output formatting and isn’t about sending a probe to ports.

TCP Ping is a host-discovery method that sends a TCP probe to a specific port to see if the host answers, without completing a full TCP handshake. The -PT switch selects this TCP Ping type, and the ports that follow tell Nmap which destinations to probe. So -PT100,90 specifically instructs Nmap to perform a TCP Ping to ports 100 and 90 on the target. That combination is exactly how you indicate a TCP Ping to particular ports.

Other switches change the ping type or the discovery method. For example, a TCP ACK ping uses a different flag, not the plain TCP Ping, and ARP-based probing uses -PR, which is a distinct approach suitable for local networks. The -oN option, on the other hand, controls output formatting and isn’t about sending a probe to ports.