LLDP in Networking

B

Answer: C. The LLDP update frequency is a fixed value.

Explanation:

Link Layer Discovery Protocol (LLDP) is a vendor-neutral Layer 2 protocol used to discover information about neighboring network devices. LLDP is an IEEE standard protocol (802.1AB) that is supported by multiple vendors, including Cisco.

The LLDP update frequency is a fixed value, and it is sent every 30 seconds by default. This interval can be adjusted to meet specific network requirements using the LLDP timer command.

LLDP is configured on each network device individually, and it is not a global configuration mode command. LLDP is enabled by default on most network devices, and it can be disabled or enabled on specific interfaces.

LLDP operates at the Data Link layer, which is Layer 2 of the OSI model. It does not run over the transport layer, which is Layer 4 of the OSI model. LLDP does not provide any transport layer services, such as reliability or error checking. It simply sends and receives information about neighboring devices, including device type, hostname, IP address, and port information.

LLDP is not a Cisco proprietary protocol. It is an industry-standard protocol that is supported by multiple vendors, including Cisco. Other vendors may use a similar protocol called the Cisco Discovery Protocol (CDP), which is a proprietary protocol used exclusively by Cisco devices.