Why Use CDP in Network Administration?

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CDP ( Cisco Discovery Protocol) is a proprietary protocol developed by Cisco, which is used to share information about directly connected Cisco equipment. CDP allows network devices to exchange information about each other's capabilities and configuration information. The following are two reasons why a network administrator would use CDP:

C. To obtain VLAN information from directly connected switches: CDP can be used to obtain VLAN information from directly connected switches. When CDP is enabled on a switch, it can provide information about the remote switch's VLAN configuration, which can be helpful in troubleshooting network issues. This information can also be used to verify that the VLANs are configured correctly and that they are properly segmented across the network.

D. To verify Layer 2 connectivity between two devices when Layer 3 fails: CDP can be used to verify Layer 2 connectivity between two devices when Layer 3 fails. For example, if a router is unable to communicate with a switch, CDP can be used to determine if the problem is due to Layer 2 connectivity issues. CDP can also be used to determine if a particular switch is connected to the network, and if so, what type of device it is.

A. To verify the type of cable interconnecting two devices: This answer is incorrect because CDP is not used to verify the type of cable interconnecting two devices. Instead, network administrators use other tools, such as a cable tester, to verify cable type and connectivity.

B. To determine the status of network services on a remote device: This answer is incorrect because CDP does not provide information about the status of network services on a remote device. Instead, network administrators use other tools, such as ICMP or SNMP, to determine the status of network services on a remote device.

E. To obtain the IP address of a connected device in order to telnet to the device: This answer is incorrect because CDP does not provide the IP address of a connected device. Instead, network administrators use other tools, such as ARP or DHCP, to obtain the IP address of a connected device.

F. To determine the status of the routing protocols between directly connected routers: This answer is incorrect because CDP does not provide information about the status of routing protocols between directly connected routers. Instead, network administrators use other tools, such as the show ip protocols command, to determine the status of routing protocols between directly connected routers.