SNMP credentials Discovery explores many kinds of devices (switches, routers, printers, etc.) using the SNMP protocol. Credentials for SNMP do not include a user name, just a password, called the community string. The default read-only community string for many SNMP devices is public, and Discovery will try that automatically. Enter the appropriate SNMP credentials if they differ from the public community string. Discovering SNMP uses all community strings that are configured. This behavior does not apply to discovering SNMPv3. The default Orchestration activity SNMP Query returns the object identifier (OID) of a device and requires SNMP credentials.