Wide Area Networks

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

A 1 and 2

B All of the above

C 2 and 4

D 3, 4 and 5

ANS:A - 1 and 2

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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