SNMPv3 introduces advanced security which splits the authentication and the authorization into two pieces:  

SNMPv3 introduces advanced security which splits the authentication and the authorization into two pieces:  

The USM is the default Security Module (and the only one we currently support). The U stands for User-based, as it is contains a list of users and their attributes. The USM is described by RFC 2574.  

The USM is the default Security Module for SNMPv3. The U stands for User-based, as it is contains a list of users and their attributes. The USM is described by RFC 2574.