: It periodically sends advertisements to a multicast address, allowing neighbors to build a local "neighbor table".
The is a proprietary Layer 2 network protocol developed by Cisco Systems. Since its introduction in 1994, it has become a fundamental tool for network administrators to discover and manage directly connected Cisco equipment without needing to know their IP addresses beforehand. Core Functionality and Operation cdp cisco
CDP operates as a and network-independent protocol. It works at the Data Link Layer, meaning it allows routers, switches, and other Cisco devices to communicate even if they do not share a common Layer 3 protocol (like IP). : It periodically sends advertisements to a multicast
