CDP: Reasons for Network Administrators to Use It

Two Reasons to Use CDP in Network Administration

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Question

What are two reasons a network administrator would use CDP? (Choose two.)

Answers

A. to verify the type of cable interconnecting two devices

B. to determine the status of network services on a remote device

C. to obtain VLAN information from directly connected switches

D. to verify Layer 2 connectivity between two devices when Layer 3 fails

E. to obtain the IP address of a connected device in order to telnet to the device

F. to determine the status of the routing protocols between directly connected routers.

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Explanations

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A. B. C. D. E. F.

DE.

CDP or Cisco Discovery Protocol is a proprietary protocol used by Cisco devices to share information about directly connected neighboring devices. CDP operates at the Data Link Layer (Layer 2) of the OSI model and sends periodic messages to neighboring devices.

The two reasons a network administrator would use CDP are:

To obtain VLAN information from directly connected switches - Answer C

CDP can provide information about neighboring devices such as device type, device name, and VLAN information. By using CDP, network administrators can determine the VLAN information of directly connected switches without logging in to the switch. This information can help network administrators to troubleshoot VLAN configuration issues and to ensure that VLANs are configured consistently throughout the network.

To verify Layer 2 connectivity between two devices when Layer 3 fails - Answer D

When Layer 3 fails, Layer 2 connectivity can be verified using CDP. CDP can provide information about neighboring devices, including their physical connection status. By using CDP, network administrators can verify if two devices are directly connected and functioning properly at Layer 2. This information can be useful in troubleshooting network connectivity issues and in determining the root cause of Layer 3 failures.

Answers A, B, E, and F are incorrect because CDP does not provide information related to those network services. CDP is primarily used for discovering and obtaining information about neighboring Cisco devices.

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