Which option performs a UDP Ping to ports 100 and 90?

Which option performs a UDP Ping to ports 100 and 90?

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

Answer: (B)

UDP Ping probes in Nmap send UDP packets to specified ports to check if a host is alive, especially useful when ICMP is blocked. To target particular ports, you specify the UDP ping option followed by a comma-separated list of ports. Using -PU100,90 sends UDP probes to ports 100 and 90, making it the exact method for performing a UDP Ping to those ports. The other options don’t fit this purpose: -PS100,90 uses TCP SYN probes to those ports, not UDP. -PI is an ICMP-based ping method, not UDP. -sU turns on a UDP port scan, which scans UDP ports for open services rather than performing a focused UDP ping to specific ports.

UDP Ping probes in Nmap send UDP packets to specified ports to check if a host is alive, especially useful when ICMP is blocked. To target particular ports, you specify the UDP ping option followed by a comma-separated list of ports. Using -PU100,90 sends UDP probes to ports 100 and 90, making it the exact method for performing a UDP Ping to those ports.

The other options don’t fit this purpose: -PS100,90 uses TCP SYN probes to those ports, not UDP. -PI is an ICMP-based ping method, not UDP. -sU turns on a UDP port scan, which scans UDP ports for open services rather than performing a focused UDP ping to specific ports.