Communicating Device Information

AC.

Cisco Discovery Protocol (CDP) is a Cisco proprietary protocol that runs on Cisco devices and is used to share information about other directly connected Cisco equipment. The information exchanged includes device type, hardware and software versions, IP address, and platform information. CDP operates at the data link layer (Layer 2) of the OSI model.

The two pieces of information that CDP can communicate about a Cisco device are:

A. the native VLAN - CDP can share information about the native VLAN configured on a device. The native VLAN is the VLAN to which untagged traffic is assigned on a trunk port. This information can be useful for troubleshooting connectivity issues related to VLANs.

C. the VTP domain - CDP can also share information about the VLAN Trunking Protocol (VTP) domain configured on a device. VTP is a Cisco proprietary protocol used to propagate VLAN configuration information across a network. This information can be useful for troubleshooting VLAN configuration issues.

The other options (B, D, and E) are incorrect:

B. the trunking protocol - CDP does not communicate information about the trunking protocol configured on a device. Trunking protocols like IEEE 802.1Q and ISL are used to carry traffic for multiple VLANs over a single physical link.

D. the spanning-tree priority - CDP does not communicate information about the Spanning Tree Protocol (STP) priority configured on a device. STP is a protocol used to prevent loops in a network topology. The STP priority is used to determine the root bridge in a network.

E. the spanning-tree protocol - CDP does not communicate information about the version of STP used on a device. STP has multiple versions, such as IEEE 802.1D and IEEE 802.1w.

In summary, CDP can communicate information about the native VLAN and the VTP domain configured on a Cisco device.