This object specifies a set of transport endpoints from which a command responder application will accept management requests. If a management request containing this community is received on a transport endpoint other than the transport endpoints identified by this object, the request is deemed unauthentic. The transports identified by this object are specified in the snmpTargetAddrTable. Entries in that table whose snmpTargetAddrTagList contains this tag value are identified. If the value of this object has zero-length, transport endpoints are not checked when authenticating messages containing this community string.