The SNMP (Simple Network Management Protocol) security levels are:
1. No authentication, no privacy (noAuthNoPriv): This level provides no authentication or encryption. SNMP requests are sent in clear text and can be easily intercepted and manipulated. It should only be used on secure, private networks.
1. Authentication, no privacy (authNoPriv): This level provides authentication but no encryption. An SNMP message includes a message digest that is used to verify that the message has not been tampered with. However, the message contents are still visible in clear text.
1. Authentication, privacy (authPriv): This level provides both authentication and encryption. An SNMP message includes a message digest for authentication and is also encrypted using a secret key for privacy. This level is the most secure and recommended for use on public networks.
Note that the security levels depend on the version of SNMP being used. SNMPv1 and SNMPv2 only support noAuthNoPriv and authNoPriv, while SNMPv3 supports all three levels.
