There are three versions of SNMP: SNMPv1, SNMPv2, and SNMPv3.
SNMPv1: It is the first version of SNMP which provides basic functionality for managing network devices. SNMPv1 protocols are used to retrieve and set variable values on network devices. SNMPv1 includes a limited set of security mechanisms for SNMP messages.
SNMPv2: It is the second version of SNMP which extends the functionality of SNMPv1. SNMPv2 added new features such as support for larger data types, improved error handling and more complex operations. SNMPv2 also includes two sub-versions: SNMPv2c and SNMPv2u.
SNMPv2c: It is community-based SNMPv2 protocol which provides improved error handling and support for bulk retrieval of data.
SNMPv2u: It is the unauthenticated SNMPv2 protocol which provides the ability to transfer SNMP messages over UDP/IP.
SNMPv3: It is the latest version of SNMP which provides the most secure and advanced features. SNMPv3 includes new security and authentication mechanisms to protect the SNMP messages from unauthorized access. SNMPv3 also supports multiple levels of data encryption, improved error handling, advanced notification mechanisms, and better scalability.
