3 good questions and answers: "IS-IS - Level of Routing in OSI Networks"

What does level 0 routing mean?
-Routing between two ES node on the same link
-Routing between an ES node and its nearets IS (intermediate system)
What does level 2 routing mean?
Routing between ES nodes in different areas of a domain
How does IS-IS level 0 discover neighbor ES and IS(gateway) and how much are these sent?
Using hello's send by IS and ES

Neighbor advertisemens are not sent periodically
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