This information should, however, be accessible to devices on the internal networks of RT

Refer to the exhibit.

For security reasons, information about RTA, including platform and IP addresses, should not be
accessible from the Internet. This information should, however, be accessible to devices on the
internal networks of RTA.
Which command or series of commands will accomplish these objectives?

A.
RTA(config)#no cdp run

B.
RTA(config)#no cdp enable

C.
RTA(config)#interface s0/0
RTA(config-if)#no cdp run

D.
RTA(config)#interface s0/0
RTA(config-if)#no cdp enable

Explanation:
http://www.cisco.com/en/US/tech/tk962/technologies_tech_note09186a00801aa000.shtml#topicen
ab
When CDP is enabled globally using the cdp run command, it is enabled by default on all
supported interfaces (except for Frame Relay multipoint subinterfaces) to send and receive CDP
information. You can disable CDP on an interface that supports CDP with the no cdp enable
command.
Router#show cdp neighbors
Capability Codes: R – Router, T – Trans Bridge, B – Source Route Bridge
S – Switch, H – Host, I – IGMP, r – Repeater

Router#
On this router, CDP is enabled on Serial 1 and Ethernet 0 interfaces. Disable CDP on the Serial 1
interface and
verify if the neighbor device is discovered on the serial 1 interface, as this output shows:
Router#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)#interface s1
Router(config-if)#no cdp enable
Router(config-if)# Z

Router#4w5d: %SYS-5-CONFIG_I: Configured from console by console