Which SNMP Version to Use?
Page 158 7705 SAR OS System Management Guide
Which SNMP Version to Use?
SNMPv1 and SNMPv2c do not provide security, authentication, or encryption. Without 
authentication, an unauthorized user could perform SNMP network management functions 
and eavesdrop on management information as it passes from system to system. Many 
SNMPv1 and SNMPv2c implementations are restricted read-only access, which, in turn, 
reduces the effectiveness of a network monitor in which network control applications cannot 
be supported. 
To implement SNMPv3, an authentication and encryption method must be assigned to a user 
in order to be validated by the 7705 SAR. SNMP authentication allows the router to validate 
the managing node that issued the SNMP message and determine if the message was 
tampered with.