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  1. Junior Member Registered Member
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    #1

    Default CCDP 300-320 - Advantages of route summarization to a client?

    Hi all.

    Someone can help me, I'm not sure what the answer to this question is.

    Which two elements comprise the backbone are while designing a new network utilizing IS-IS as the interior gateway protocol (choose two)

    A. contiguos chain of Level 2 capable routers
    B. contiguos chain of Level1/Level 2 capable Routers
    C. set of Level 2 configured interfaces
    D. contiguous Level 1 capable Routers
    E. set of Level 1 configured interfaces


    Thanks.
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  3. /threadkiller ande0255's Avatar
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    #2
    IS-IS is not on the ROUTE exam, is that a question you saw on the actual ARCH exam?

    I am not really sure, but I would answer B and D for this question, not knowing anything about IS-IS.
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  4. Senior Member matt333's Avatar
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    #3
    A and B I'd say. Level 2 is considered the backbone for IS-IS Level1/2 are borders of the backbone.

    IS-IS is on the Arch exam, theres is a LARGE chapter on it. I am currently studying for this exam as well

    Hope this helps.
    Studying Arch Exam

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  5. Padawan d4nz1g's Avatar
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    #4
    id go a and c.

    i think this question would really be " Which two elements comprise the backbone areA while designing a new network utilizing IS-IS as the interior gateway protocol (choose two) ". Isnt that correct? that are in there does not make sense

    so a and c would best describe a backbone (l2) area in isis. you won't necessarily need a l1 area in an isis network
    2017 - CCIE RS
    Labbing, labbing, labbing.
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  6. Junior Member
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    CCNP, CCNA R&S, CCNA SEC, CCNA Voice, CCDA, ITIL, Six SIGMA, SEC Plus
    #5
    Answer is A and B.

    To compare to OSPF:

    L2 only routers are your backbone.
    L1/2 routers are similar to your ABRs in that they learn the routes for both the L1 and the L2 Domains.
    L1 only are your intra Area routers. They only learn for their local domain and where the nearest L1/L2 router is for when they need to exit said domain.
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