What is LLDP and CDP?

The identification and set up of data networks is simplified by the protocols that have been developed. However, when things go wrong, identifying the fault can be difficult without the right tools and equipment. Physically tracing a network is difficult, and if it’s spread over several buildings, it’s almost impossible. Fortunately, two network discovery protocols have been developed that can simplify this task. These are the Cisco Discovery Protocol (CDP) and the Link Layer Discovery Protocol (LLDP). When using suitable software or testing devices in conjunction with these protocols, it is possible to generate a network map and find out what’s wrong.

Source: Blog.T3innovation.com