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TCP/IP Guide by Charles M. Kozierok

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SNMP Version 3 (SNMPv3) Message Format

In the late 1990s, SNMPv3 was created to resolve the problems that occurred with the many different variations of SNMPv2. The SNMPv3 Framework adopts many components that were created in SNMPv2, including the SNMPv2 protocol operations, PDU types, and PDU format. The significant changes made in SNMPv3 include a more flexible way of defining security methods and parameters to allow the coexistence of multiple security techniques.

The general message format for SNMPv3 still follows the same idea of an overall message wrapper that contains a header and an encapsulated PDU, but it is further refined. The fields in the header have themselves been divided into those dealing with security and those that do not deal ...

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