You work as a Network Administrator for McRoberts Inc. You are expanding your company’s
network. After you have implemented the network, you test the connectivity to a remote host by
using the PING command. You get the ICMP echo reply message from the remote host. Which of
the following layers of the OSI model are tested through this process? Each correct answer
represents a complete solution. Choose all that apply.

A.
Layer 3

B.
Layer 2

C.
Layer 4

D.
Layer 1