Which WAN encapsulations can be configured on an asynchronous serial connection? PPP ATM HDLC SDLC Frame Relay

1 and 2
2 and 4
3, 4 and 5
All of the above

Correct Answer: 1 and 2

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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