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  1. Which type of OSPF network will elect a backup designated router?
    1. Broadcast multi-access
    2. Non-broadcast multi-access
    3. Point-to-point
    4. Broadcast multipoint

    2. A.

     1 and 2
    B.

     3 and 4
    C.

     3 only
    D.

     None of the above

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    Answer : Option A

    Explanation :

    DR and BDR are elected on broadcast and non-broadcast multi-access networks. Frame Relay is a non-broadcast multi-access (NBMA) network by default. No DR is assigned on any type of point-to-point link. No DR/BDR is assigned on the NBMA point-to-multipoint due to the hub/spoke topology.

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