Discussion
Which protocol does Ping use?
Answer: C
Correct answer: ICMP
Ping sends an ICMP echo request and waits for an echo reply, timing the round trip. It carries no transport layer header at all, which is why a ping can succeed while an application still fails - reachability at the network layer says nothing about whether a TCP port is open. ARP resolves addresses within a segment, and BootP is a predecessor of DHCP.
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