JNCIS-SP IS-IS (Best IGP)
IS-IS IS-IS (Intermediate System to Intermediate System) is a link-state routing protocol commonly used in service provider networks and hey, you’re studying for the JNCIS-SP, so you’re in luck. Like OSPF, it uses the Dijkstra SPF algorithm to compute shortest paths, but it was designed to handle all sorts of traffic. So even though it was designed with CLNP in mind, it can carry things like IPv4, IPv6, and label information for mpls and srv6. ...