While using ping to test network connectivity you receive a

While using ping to test network connectivity, you receive a “Destination Host Unreachable” reply. Which of the following is the most correct interpretation of the result?

A. The end host is offline.

B. A Layer 1 problem exists between the two hosts.

C. A Layer 3 problem exists between the two hosts.

D. The end host is online.

Solution

C is correct. “Destination Unreachable” indicates there is no entry in the route table of your system, or a router on the path, for the end host.

A, B, and D are incorrect. A is incorrect because if the packet makes it to the end station’s network and the station is offline, you should receive a “Reply Timed Out” message. B is incorrect because a “Destination Host Unreachable” message indicates a Layer 3 problem, not Layer 1. D is incorrect because if the packet reaches the destination network and the device is online, you should receive a “Reply From” message.