CompTIA Security+ Question H-36

After a network outage, a PC technician is unable to ping various network devices. The network administrator verifies that those devices are working properly and can be accessed securely.
Which of the following is the MOST likely reason the PC technician is unable to ping those devices?

A. ICMP is being blocked
B. SSH is not enabled
C. DNS settings are wrong
D. SNMP is not configured properly

Answer: A

ICMP is a protocol that is commonly used by tools such as ping, traceroute, and pathping. ICMP offers no information If ICMP request queries go unanswered, or ICMP replies are lost or blocked.