What is the difference between SNMPv1, SNMPv2c, and SNMPv3?
SNMPv1 is the original protocol and framework which is described in RFCs 1155 and 1157. SNMPv2c is the revised protocol which includes improvements to SNMPv1 in the areas of protocol packet types, transport mappings, and MIB structure elements. However, it uses the existing SNMPv1 administration structure (“community-based” and hence SNMPv2c). SNMPv3 defines the secure version of the SNMP. SNMPv3 also facilitates remote configuration of the SNMP entities which makes remote administration of SNMP entities a much simpler task.
