Which choice should be checked first to isolate the issue?

exams 210-060 210-060 exam 0 Comments

A Cisco IP phone fails to register with the Cisco CallManager.

Which choice should be checked first to isolate the issue?
A . Cisco Discovery Protocol is enabled on the switch.
B . The phone generates dhcp request packets.
C . The phone generates TFTP request packets.
D . Delete and re-create the phone.

Answer: B