Which option performs a TCP SYN Ping to ports 100 and 90?

Which option performs a TCP SYN Ping to ports 100 and 90?

• A. -PS100,90
• B. -PI
• C. -PU100,90
• D. -sS

Answer: (A)

TCP SYN Ping checks whether a host is reachable by sending TCP SYN packets to specific ports and observing the response. The action that does exactly this for ports 100 and 90 is the SYN ping to those ports, i.e., a SYN Ping with the port list 100,90. It uses the TCP handshake attempt to determine if the host is up, rather than actually scanning for open ports. ICMP echo requests (-PI) or UDP probes (-PU100,90) aren’t TCP SYN pings, and a normal SYN scan (-sS) probes ports to see which are open rather than just verifying reachability.

TCP SYN Ping checks whether a host is reachable by sending TCP SYN packets to specific ports and observing the response. The action that does exactly this for ports 100 and 90 is the SYN ping to those ports, i.e., a SYN Ping with the port list 100,90. It uses the TCP handshake attempt to determine if the host is up, rather than actually scanning for open ports. ICMP echo requests (-PI) or UDP probes (-PU100,90) aren’t TCP SYN pings, and a normal SYN scan (-sS) probes ports to see which are open rather than just verifying reachability.