Which protocol operates at Layer 2 (L2) and enables network devices from different vendors to discover and share information with each other?
VLAN Trunking Protocol (VTP)
Cisco Discovery Protocol (CDP)
Link Layer Discovery Protocol (LLDP)
Dynamic Trunking Protocol (DTP)
Link Layer Discovery Protocol (LLDP) operates at Layer 2 (L2) and is an open-standard protocol that allows network devices from different vendors to advertise their identity and capabilities to neighboring devices. This facilitates device discovery and network management in multi-vendor environments. Cisco Discovery Protocol (CDP) is a proprietary protocol developed by Cisco and only operates between Cisco devices. VLAN Trunking Protocol (VTP) is used for managing VLAN configurations across switches but does not assist in device discovery. Dynamic Trunking Protocol (DTP) is also proprietary to Cisco and is used to negotiate trunk links between network devices, not for device discovery.
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