Comprehensive and Detailed Explanation From Exact Extract:
SNMP version 3 introduces enhanced security features, including the use of usernames and passwords (authentication and encryption). SNMP v1 and v2c only use community strings, which are essentially passwords but without username support or encryption. SNMP v4 does not exist.
[Reference:, , "SNMPv3 supports authentication with usernames and passwords and offers encrypted communication, unlike SNMPv1 and SNMPv2c, which use only community strings.", — (Network Performance Monitor Administrator Guide, SNMP version overview), , ===========, ]
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