Which host discovery option sends IP packets with the IP header set to a specific protocol number for discovery?

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Multiple Choice

Which host discovery option sends IP packets with the IP header set to a specific protocol number for discovery?

Explanation:
IP protocol ping is the method that probes a host by sending IP packets with the Protocol field in the IP header set to a specific value. This means you’re not using a usual port-based handshake or an ICMP echo; instead, you designate a protocol number (like TCP or UDP) and see if the host responds, indicating it’s reachable. The other options rely on actual transport-layer protocols or ICMP and do not involve setting the IP header’s Protocol field, so they don’t meet the described approach.

IP protocol ping is the method that probes a host by sending IP packets with the Protocol field in the IP header set to a specific value. This means you’re not using a usual port-based handshake or an ICMP echo; instead, you designate a protocol number (like TCP or UDP) and see if the host responds, indicating it’s reachable. The other options rely on actual transport-layer protocols or ICMP and do not involve setting the IP header’s Protocol field, so they don’t meet the described approach.

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