Which action should be taken to enable routing across area boundaries in this environment?

An organization is using a link state routing protocol that is not dependent on IP addressing. Which action should be taken to enable routing across area boundaries in this environment?
A. Assign Level 1 router interfaces to different areas
B. Assign Level 2 routers to different areas
C. Assign Level 1 routers to different areas
D. Assign Level 2 router interfaces to different areas
E. Assign Level 2 router interfaceto the backbone area
F. Assign Level 1 router interface to the backbone area

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3 thoughts on “Which action should be taken to enable routing across area boundaries in this environment?

    1. The Cisco ARCH book (Designing for Cisco Network Service Archtectures) does mention backbone areas in context with IS-IS.

  1. I think the correct answers are B, AND D OR E.
    The IS-IS Backbone is a contiguous chain of L2-capable routers (L2 or L1/L2) that hold the information for complete interarea routing.
    Level 1 routing is routing within an area. A Level 1 router knows only the topology of its own area and can have Level 1 or Level 1/Level 2 neighbors only in its own area. It has a Level 1 linkstate database with all the information for intra-area routing. It uses the closest L1/L2 router in its own area to send packets out of the area
    Level 2 routing is routing between different areas. A Level 2-capable router (L2 or L1/L2) may have L2 neighbors in the same or in different areas, and it has a Level 2 link-state database with all information for interarea routing. The router can also serve as an L1/L2 system, in which case it has both L1 and L2 link-state databases

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