Q74IP Services
Which SNMP message type is reliable and comes before an acknowledgment response from the SNMP manager?
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Discussion · 5
B 3
Selected Answer: B
From the official cert guide:
Inform messages are like Trap messages, but with reliability added. Added to the protocol with SNMP Version 2 (SNMPv2), Informs still use UDP, but add application layer reliability. The NMS has to acknowledge receipt of the Inform with an SNMP Response message, or the SNMP agent will time out and resend the Inform.
The answer is B.
2
Correct me if I’m wrong, but I think it’s trap
2
Traps are less reliable than informs because an acknowledgment is not sent from the receiving end when a trap is received; however, an SNMP manager that gets an inform acknowledges the message with an SNMP response PDU. If the sender does not get a response for an inform, the inform can be sent again.
1
nformRequest –
It was introduced in SNMPv2c, used to identify if the trap message has been received by the manager or not. The agents can be configured to send trap message continuously until it receives an Inform message. It is the same as a trap but adds an acknowledgement that the trap doesn’t provide.
B 1
Selected Answer: B
B. Inform