What is the difference between the types of routes allowed by default into IS-IS and OSPF areas?
By default, all routes are advertised into all OSPF areas. This includes inter area OSPF routes and external routes that have been injected into OSPF. By default, IS-IS does not advertise inter area or external routes into an area, but injects a default route.
What is route leaking?
Redistribution of Level 2 routes into an area as Level l routes.
Compare IS-IS metrics with OSPF metrics.
An OSPF interface metric is determined from the interface bandwidth. By default, all IS¬-IS interface metrics are equal to 10. Therefore, the EIGRP route is preferred.
What is the difference between an IS-IS narrow and wide metric?
A narrow metric uses 6 bits for the interface metric and 10 bits for the path metric. A wide metric uses 24 bits for the interface metric and 32 bits for the path metric.
What types of routes are allowed into a stub area?
OSPF intra-area and inter area routes, and a default route. External routes are not advertised into a stub area.