With Simple Tester, managers and agents can communicate with one another because they share a common understanding of the data being exchanged (MIBs) and use the same mechanism to exchange that data.
The Simple Tester is a SNMP test tool that automatically exercises SNMP v1, v2C, and v3 agents. This program is an SNMP program that will intelligently interpret MIB files, SNMP protocol specifications, and all the MIB objects supported by the agent.