Cisco Certified Network Professional (CCNP) Question:

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Describe the difference between an OSPF and IS-IS backbone.

CCNP Interview Question
CCNP Interview Question

Answer:

OSPF has a backbone area or area 0. All nonzero areas must be connected to the backbone through a router or a virtual link. IS-IS has a backbone area made up of a contiguous chain of Level 2 capable routers.

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Assume a router has a loopback address of 135.77.9.254. Convert the loopback address to an IS-IS system ID.In IS-IS, what does Level 1 routing mean?