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There are different notification operations that can be used by SNMP to notify the SNMP manager of an important system event. Which of the following SNMP versions added the "inform" notification?
SNMPv3
SNMPv1.99
SNMPv2c
SNMPv1
SNMP uses traps and informs to notify the SNMP manager of an important system event. Trap notification was defined in SNMPv1 while Inform notification was defined in SNMPv2c. The main difference between the two is that Inform notification sends acknowledged messages from the SNMP agent to the SNMP manager while the Trap notification doesn't send acknowledged messages. Configuring SNMPv3 is more complicated and is not commonly deployed. Features offered in SNMPv3 are Message Integrity, Authentication, and Encryption. (http://www.ciscopress.com/articles/article.asp?p=1730888)
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