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  1. Which WAN encapsulations can be configured on an asynchronous serial connection?
    1. PPP
    2. ATM
    3. HDLC
    4. SDLC
    5. Frame Relay

    2. A.

     1 and 2
    B.

     2 and 4
    C.

     3, 4 and 5
    D.

     All of the above

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    Answer : Option A

    Explanation :

    Please do not freak out because ATM is an answer to this question. ATM is not covered in depth on the CCNA exam. PPP is mostly used for dial-up (async) services, but ATM could be used as well, though it typically is not used anymore since PPP is so efficient.

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