A community string is a text string that an SNMP agent uses for authorization. A network management station sends a community string with each message it sends to the agent. The agent can then verify whether the network management station is authorized to get information. Community strings are not concealed when sent in SNMP packets; strings are sent in ASCII text.
You can configure the community string for the SNMP master agent from the Community Strings page in the Server Manager. You also define the SNMP-related operations that a particular community can perform. From the Server Manager, you can view, edit, and remove the communities you have already configured.