Now is as good a time as any to discuss Cisco Discovery Protocol.
CDP is a hot exam topic because it provides a means to discover information about network devices before any configuration has been applied. This is a very useful troubleshooting tool; however, it also presents a security risk.
CDP is Cisco proprietary, which means it will only work on Cisco devices. It is a Layer 2 service used by devices to advertise and discover basic information about directly connected neighbours. The IEEE version of CDP is Link Layer Discovery Protocol (LLDP), but this is not included in the . . .
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