In recent years, the IS-IS routing protocol has become increasingly popular, with widespread usage among Service Providers a part from OSPF.
Many Cisco Engineers are good with routing protocols ( like OSPF, EIGRP, RIPv2)
ISIS is the protocol majorly used inside Service providers Networks apart from OSPF.
This course will be very handy for anyone who want to master ISIS from basics.
ISIS for IPV4/IPV6 already part of Cisco ( CCNA,CCNP,CCIE ) service Provider Track and even added to new CCIE RS version 5 .