CompTIA Network+ (N10-009) — Question 436

Which of the following tools uses ICMP to help determine whether a network host is reachable?

Answer options

• A. tcpdump
• B. netstat
• C. nslookup
• D. ping

Correct answer: D

Explanation

The correct answer is D, ping, as it specifically employs ICMP echo request and echo reply messages to determine if a host is reachable. The other options, tcpdump, netstat, and nslookup, serve different purposes: tcpdump is for packet capturing, netstat displays network connections, and nslookup resolves domain names to IP addresses.