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  1. Which encapsulations can be configured on a serial interface?
    1. Ethernet
    2. Token Ring
    3. HDLC
    4. Frame Relay
    5. PPP

    2. A.

     1 and 4
    B.

     2 only
    C.

     3, 4 and 5
    D.

     All of the above

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    Answer : Option C

    Explanation :

    Ethernet and Token Ring are LAN technologies and cannot be configured on a serial interface. PPP, HDLC, and Frame Relay are layer 2 WAN technologies that are typically configured on a serial interface.

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