Which of the following protocols does the ping utility use for “Echo request” and “Echo reply” messages?
  1. SMTP
  2. SNMP
  3. NTP
  4. ICMP
Explanation
Answer - D - The ping utility uses the ICMP protocol to perform network diagnostics.

Key Takeaway: The ping utility sends a small packet of information containing an ICMP ECHO_REQUEST to a specified computer, which then sends an ECHO_REPLY packet in return. Simple Mail Transfer Protocol (SMTP) is an Internet standard for electronic mail (e-mail) transmission across Internet Protocol (IP) networks. Simple Network Management Protocol (SNMP) is used in network management systems to monitor network-attached devices for conditions that warrant administrative attention. Network Time Protocol (NTP) is a protocol for synchronizing the clocks of computer systems over packet-switched, variable-latency data networks.
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