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

Explanation:
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.