Which data does a device advertise over LLDP?

A device uses Link Layer Discovery Protocol (LLDP) to advertise its identity and capabilities to directly connected devices on a local area network. The information typically shared includes the device's hostname, MAC address, supported Power over Ethernet (PoE) capabilities, port descriptions, and other specific device details. By advertising this data, devices can efficiently discover each other's characteristics, enhancing the overall network management and troubleshooting experience. This capability allows network administrators to obtain vital information about devices, enabling better configuration and network optimization.

The other options do not represent the typical data shared through LLDP. Router configurations and security settings are generally managed through other protocols and configurations rather than being advertised directly. Quality of Service (QoS) policies, while important for network performance, are typically implemented through configuration commands rather than being included in LLDP advertisements.