Which statement about Cisco Discovery Protocol is true?
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A. B. C. D.A.
Cisco Discovery Protocol (CDP) is a Cisco proprietary protocol used to share information about directly connected Cisco equipment, such as routers, switches, and firewalls.
The correct answer to the question is A. It is a Cisco-proprietary protocol. CDP is a proprietary protocol developed by Cisco, which means it is only supported on Cisco devices and not on equipment from other vendors.
B. It runs on the network layer is an incorrect statement. CDP operates at the data link layer of the OSI model, which means it communicates directly with adjacent network devices on the same LAN segment.
C. It can discover information from routers, firewalls, and switches is partially true. CDP is capable of discovering information about directly connected Cisco devices, including their device ID, IP address, and port information. However, it cannot discover information from firewalls or other non- Cisco devices.
D. It runs on the physical layer and the data link layer is an incorrect statement. CDP operates only on the data link layer of the OSI model, specifically on Layer 2, which is responsible for the communication between adjacent devices on a LAN.
In summary, CDP is a Cisco-proprietary protocol that runs on the data link layer and is capable of discovering information about directly connected Cisco devices.