Which two pieces of information about a Cisco device can Cisco Discovery Protocol communicate? (Choose two.)
Click on the arrows to vote for the correct answerA. B. C. D. E.
Cisco Discovery Protocol (CDP) is a proprietary protocol used by Cisco devices to gather and share information about other directly connected Cisco equipment. CDP is enabled by default on Cisco devices and runs at the data-link layer (Layer 2) of the OSI model.
CDP can communicate various types of information about a directly connected Cisco device, including the device type, software version, and the platform. Additionally, CDP can also communicate the following two pieces of information about a Cisco device:
A. The native VLAN: CDP can communicate the VLAN that is configured as the native VLAN on the trunk port of a Cisco device. The native VLAN is the VLAN that is not tagged with a VLAN ID when it travels across a trunk link. CDP can provide information about the native VLAN on a Cisco device so that other Cisco devices can match the native VLAN on their trunk port to avoid VLAN mismatch issues.
C. The VTP domain: CDP can communicate the VLAN Trunking Protocol (VTP) domain name configured on a Cisco device. VTP is a Cisco proprietary protocol that enables VLAN management across a network. By exchanging VTP messages, Cisco devices can synchronize VLAN configuration information and maintain consistency of VLANs throughout the network. CDP can provide information about the VTP domain name on a Cisco device, which is used to identify the administrative domain for VTP.
Therefore, the correct answers are A (the native VLAN) and C (the VTP domain). The other options, B (the trunking protocol), D (the spanning-tree priority), and E (the spanning-tree protocol), are not pieces of information that CDP can communicate. Trunking protocol and spanning-tree related information are typically exchanged using other protocols such as Dynamic Trunking Protocol (DTP) and Spanning Tree Protocol (STP), respectively.