You are the network administrator for your company and have configured Cisco Discovery Protocol (CDP) in
your network. You recently noticed that when devices send large numbers of CDP neighbor announcements,
some devices are crashing. You decide to disable CDP on the router.
Which command should you use to achieve the objective?

A.
no cdp run

B.
set cdp disable

C.
no cdp enable

D.
no cdp advertise-v2

Explanation:
You should use the no cdp run command to disable CDP on the router. Due to a known vulnerability regarding
the handling of CDP by Cisco routers and switches when devices send large numbers of CDP neighbor
announcements, some devices can crash or cause abnormal system behavior. To overcome this problem, you
can disable CDP for the entire router by using the no cdp run command.
You cannot use the set cdp disable command to disable CDP on the router. This command disables CDP on
an entire Catalyst switch.
You cannot use the no cdp enable command to disable CDP on the router. This command disables CDP on a
specific interface.
You cannot use the no cdp advertise-v2 command to disable CDP on the router. This command disables
CDPv2 advertisements.
Objective:
LAN Switching Fundamentals
Sub-Objective:
Configure and verify Layer 2 protocols

Cisco > Support > Using Cisco Discovery Protocol
Cisco > Support > Technology Support > Network Management > Cisco’s Response to the CDP Issue >
Document ID: 13621