Which SNMP message sent by an agent is reliably delivered and requires an acknowledgment from the manager?
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Correct answer: Inform.
Why this is the answer
The Inform message is a type of SNMP notification sent by an agent to a manager that requires an acknowledgment. This makes it a reliable delivery mechanism, as the agent will retransmit the Inform message if it doesn't receive an acknowledgment from the manager. Get and Set messages are initiated by the manager to retrieve or modify information on the agent, not sent by the agent as a notification. Traps are notifications sent by the agent to the manager, but they are unreliable; the agent does not require an acknowledgment and will not retransmit a Trap if it's not received.
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