Link Layer Discovery Protocol (LLDP) Overview | Cisco Solutions
Question
Which statement about LLDP is true?
Answers
Explanations
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A. B. C. D.B.
The correct answer is C: The LLDP update frequency is a fixed value.
LLDP (Link Layer Discovery Protocol) is a vendor-neutral link layer protocol used by network devices to exchange information about their identity, capabilities, and neighbors on a local area network (LAN). LLDP is not a Cisco proprietary protocol and is supported by a wide range of networking equipment vendors.
LLDP is typically enabled on a per-interface basis rather than being configured in global configuration mode. This allows for more granular control over which interfaces participate in LLDP discovery.
LLDP messages are sent periodically by each participating device and the frequency of these messages is fixed. The default update frequency for LLDP is every 30 seconds, although this can be adjusted on some devices.
Finally, LLDP operates at the data link layer (Layer 2) of the OSI model, rather than the transport layer (Layer 4). This means that LLDP messages are sent directly between neighboring devices without any need for transport-layer protocols such as TCP or UDP.
