What will be the output of the show cdp neighbors detail command issued on Router A? (Click the Exhibit(s)
button to view the network diagram.)

A.
Device ID: RTR2511
Entry address(es):
IP address: 178.10.20.1
Platform: cisco 2511, Capabilities: Router
Interface Serial 0——————————————
Device ID: RTR2611-Edge
Entry address(es):
IP address: 10.10.1.2
Platform: cisco 2611, Capabilities: Router
Interface Ethernet 0

B.
Device ID: RTR2611
Entry address(es):
IP address: 172.10.20.1
Platform: cisco 2611, Capabilities: Router
Interface Ethernet 0
——————————————–
Device ID: C2924C-123
Entry address(es):
IP address: 10.10.1.3
Platform: cisco WS-C2924, Capabilities: Switch
Interface Ethernet 0

C.
Device ID: RTR2511
Entry address(es):
IP address: 178.10.20.2
Platform: cisco 2511, Capabilities: Router
Interface Serial 0
——————————————
Device ID: C2924C-123
Entry address(es):
IP address: 10.10.1.3
Platform: cisco WS-C2924, Capabilities: Switch
Interface Ethernet 0

D.
Device ID: RTR2611
Entry address(es):
IP address: 172.10.20.1
Platform: cisco 2611, Capabilities: Router
Interface Ethernet 0

E.
Device ID: C2924C-123
Entry address(es):
IP address: 10.10.1.3
Platform: cisco WS-C2924, Capabilities: Switch
Interface Ethernet 0

Explanation:
The following code is the correct partial output of the show cdp neighbors detail command issued on Router A:
Device ID: RTR2511
Entry address(es):
IP address: 178.10.20.2
Platform: cisco 2511, Capabilities: Router
Interface Serial 0
——————————————
Device ID: C2924C-123
Entry address(es):
IP address: 10.10.1.3
Platform: cisco WS-C2924, Capabilities: Switch
Interface Ethernet 0The show cdp neighbors detail command displays the Cisco devices directly connected to the router.
Therefore, only details of the 2511 router and the Cisco Catalyst 2924 switch will be displayed in the output.
The detail keyword in the show cdp neighbor command also displays IP address information for the directly
connected devices. The output shows the connected device name, its IP address, its platform, and the local
interface through which the device is connected.
All of the other code samples are incorrect, as they include the output of devices that are not connected directly
to Router A.
Cisco Discovery Protocol (CDP) is a Cisco proprietary protocol used by all Cisco devices to collect information
about neighboring devices. CDP operates at Layer 2 of the OSI model. Therefore, it can collect information
about neighboring devices that are running different Network layer protocols. It is also useful for collecting
information when IP is not functional.
Some variations of this command include:
The show cdp command, which displays global CDP information, including timer and hold time information.
The show cdp interface command, which displays information about the interfaces on which CDP is
enabled.
The show cdp neighbors command, which displays detailed information about neighboring devices
discovered by the CDP. However, it does not include the IP address of the neighboring device.
Objective:
Infrastructure Management
Sub-Objective:
Use Cisco IOS tools to troubleshoot and resolve problems

Cisco > Cisco IOS Network Command Reference, Release 12.4 > show cdp neighbors