300-320 Question #339: Real Exam Question with Answer & Explanation

The correct answer is D: Level 2 router. In IS-IS, routing is divided into two levels: Level 1 (L1) for intra-area routing and Level 2 (L2) for inter-area/inter-domain routing. A Level 2 router maintains the L2 link-state database and can exchange routing information between different IS-IS areas or domains. To connect

Question

A link state routing protocol wants to connect tow separate domains, what should be configure ((it's a question about IS-IS)?

Options

ALevel 1 router
BLevel 1 router interface
CLevel 2 router interface
DLevel 2 router

Explanation

In IS-IS, routing is divided into two levels: Level 1 (L1) for intra-area routing and Level 2 (L2) for inter-area/inter-domain routing. A Level 2 router maintains the L2 link-state database and can exchange routing information between different IS-IS areas or domains. To connect two separate IS-IS domains, you must configure Level 2 routers at the domain boundary - these routers form the inter-domain backbone. Level 1 routers only know their own area and default-route to the nearest L1/L2 router for everything else. Level 1-2 routers participate in both, but for pure inter-domain connectivity, a Level 2 router (or L1/L2 router acting in its L2 capacity) is what establishes the connection between the two domains.

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