Which three statements about IS-IS are true? (Choose three.)
IS-IS CAN BE USED ONLY IN THE SERVICE PROVIDER NETWORK.
IS-IS CAN BE USED TO ROUTE BOTH IP AND CLNP.
IS-IS HAS THREE DIFFERENT LEVELS OF AUTHENTICATION: INTERFACE LEVEL, PROCESS LEVEL, AND DOMAIN LEVEL.
IS-IS IS AN IETF STANDARD.
IS-IS HAS THE CAPABILITY TO PROVIDE ADDRESS SUMMARIZATION BETWEEN AREAS.
