• noAuthNoPriv—No authentication or encryption
• authNoPriv—Authentication but no encryption
• authPriv—Authentication and encryption
SNMPv3provides for both security models and security levels. A security model is an authentication strategy
thatis set up for a user and the role in which the user resides. A security level is the permitted level of security
withina security model. A combination of a security model and a security level determines which security
mechanismis employed whenhandling anSNMP packet.
Supported Combinations of SNMP Security Models and Levels
Thefollowing tableidentifies what the combinationsof securitymodels andlevels mean.
Table 6: SNMP Security Models and Levels
What HappensEncryptionAuthenticationLevelModel
Usesa community
stringmatch for
authentication.
NoCommunitystringnoAuthNoPrivv1
Usesa community
stringmatch for
authentication.
NoCommunitystringnoAuthNoPrivv2c
Usesa username
matchfor
authentication.
NoUsernamenoAuthNoPrivv3
Provides
authenticationbased
onthe Hash-Based
Message
AuthenticationCode
(HMAC)Message
Digest5 (MD5)
algorithmor the
HMACSecure Hash
Algorithm(SHA).
NoHMAC-MD5or
HMAC-SHA
authNoPrivv3
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Configuring SNMP