Know the fundamentals of OSI protocols and the IS-IS and Integrated IS routing protocols. You must know that the connection-oriented protocol is CONP, the connection-oriented service is CMNS, the connectionless protocol is CLNP, and the connectionless service is CLNS.
Be aware that ISO-IGRP is a Cisco-proprietary routing protocol for CLNS based on IGRP.
Understand the difference between IS-IS and Integrated IS-IS.
Know how to define the different areas, levels, and router functions at those levels in IS-IS.
Understand the process of OSI addressing and the intricacies of the NSAP address scheme, including the structure of the NSAP address. Remember that a NSAP address with the NSEL set to 00 is known as the NET.
Be knowledgeable of the four types of IS-IS packets: LSP, Hello PDUs, PSNPs, and CSNPs.
Have a working knowledge of the IP and OSI routing process with Integrated IS-IS, including the OSI forwarding database, routing process, and linking IS-IS domains.
Know how to perform basic configuration for Integrated IS-IS and the associated commands:
is-type
isis circuit-type
isis metric
summary-address
isis priority
Be familiar with the commands used for Integrated IS-IS troubleshooting and verification, such as the following:
