Which of the following commands is the best for testing the connectivity of the crossover cable?

You are the Mega Corp Security Administrator. This company uses a firewall cluster, consisting of two cluster members. The cluster generally works well but one day you find that the cluster is behaving strangely. You assume that there is a connectivity problem with the cluster synchronization cluster link (cross-over cable).

Which of the following commands is the best for testing the connectivity of the crossover cable?
A . telnet <IP address of the synchronization interface on the other cluster member>
B . ifconfig -a
C . ping <IP address of the synchronization interface on the other cluster member>
D . arping <IP address of the synchronization interface on the other cluster member>

Answer: D