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Simple Network Management Protocol (SNMP):

• It is an application layer protocol used in request-response mode.

• Simple Network Management Protocol Version 2 (SNMPv2) defines 7 types of messages, which are known as PDUs (protocol data units).

• Trap messages are one among the 7 types of messages.

Trap messages:

• Trap messages are sent to the manager from the agent.

• These messages are generated asynchronously, which are in response to an event to inform the manager about the exceptional events.

• Exceptional events like link going up or down, irregular start by a device, or events with the authentication failure.

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