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    CCIE R&S Core Knowledge Question(6)

    By admin | April 28, 2009

    1. What is the default OSPF network for the following media types: Ethernet, Token Ring, and FDDI?

    Highlight for answer: Broadcast

    2. What OSPF router type connects one or more areas to the backbone and acts as a gateway for interarea traffic?

    Highlight for Answer: Area Border Router (ABR)

    3. To be in compliance with the BGP synchronization rule, there must be a match for the prefix in the IP routing table in order for an internal BGP (iBGP) path to be considered a valid path. What additional criteria must an OSPF route meet?Highlight for answer: The OSPF router ID must match the BGP router ID of the iBGP neighbor.

    4. Give at least two possible reasons as to why the prefix is experiencing a RIB-failure:

    R1> sh ip bgp
    BGP table version is 5, local router ID is
    Status codes: s suppressed, d damped, h history, * valid, > best, i – internal,
    r RIB-failure
    Origin codes: i – IGP, e – EGP, ? – incomplete

    Network          Next Hop            Metric LocPrf Weight Path
    r>                   0    110      0 300 i
    *>                   0    160      0 300 i

    Highlight for answer: Generally this is due to the existence of a route with a lower AD in the IP routing table.  This can also be due to a memory error or the number of routes in VRF exceeding the route-limit configured under the VRF instance (outside of the scope of the Routing and Switching lab…)

    5. What is the difference between OSPF neighbor and adjacencies?

    Highlight for answer: A neighbor is another OSPF router that is attached to one of the first router’s directly connected links.

    An OSPF adjacency is a conceptual link to a neighbor over which LSAs can be sent.


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    Topics: CCIE R&S, Open-Ended-Question | 1 Comment »

    One Response to “CCIE R&S Core Knowledge Question(6)”

    1. How I Lost Thirty Pounds in Thirty Days Says:
      May 4th, 2009 at 7:33 am

      Hi, good post. I have been thinking about this issue,so thanks for posting. I’ll definitely be subscribing to your blog.


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