Which statement about Cisco Discovery Protocol is true?
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A. B. C. D.C
Cisco Discovery Protocol (CDP) is a proprietary protocol used by Cisco networking devices to share information about other directly connected Cisco equipment. It enables devices to share information about their capabilities and status, such as the device type, device ID, and IP address.
Answer A is correct. CDP is used to discover information from routers, firewalls, and switches. It can provide useful information, such as the device name, device type, and the interface to which it is connected. This information is helpful for network administrators when troubleshooting network issues or planning network changes.
Answer B is incorrect. CDP is not a network layer protocol. It runs on the data link layer, which is Layer 2 of the OSI model. It operates on the same layer as other link-layer protocols such as Address Resolution Protocol (ARP) and Spanning Tree Protocol (STP).
Answer C is correct. CDP is a Cisco proprietary protocol, meaning it is developed and owned by Cisco. Other networking vendors have developed their own similar protocols, such as Link Layer Discovery Protocol (LLDP), which is an industry-standard protocol that can be used on non- Cisco devices.
Answer D is incorrect. CDP runs only on the data link layer, which is Layer 2 of the OSI model. It does not operate on the physical layer, which is Layer 1, although it does use information from that layer.