Which of the following tools uses ICMP to help determine whether a network host is reachable?
tcpdump
netstat
nslookup
ping
Ping sends ICMP Echo Request packets and waits for Echo Replies to verify host reachability and measure round-trip time.
A. tcpdump captures packets but does not test reachability.
B. netstat displays open ports and network sessions.
C. nslookup queries DNS servers for name resolution.
References (CompTIA Network+ N10-009):
Domain: Networking Concepts — ICMP operation, troubleshooting tools.
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