CCNA Practice Exam Test Sample – Question 256

Refer to the exhibit.
An administrator pings the default gateway at and sees the output as shown. At which OSI layer is the problem?

A. data link layer
B. application layer
C. access layer
D. session layer
E. network layer

Correct Answer: E
Section: Troubleshooting

The command ping uses ICMP protocol, which is a network layer protocol used to propagate control message between host and router. The command ping is often used to
verify the network connectivity, so it works at the network layer.