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

PPP & ATM 

Thanking

--Ani

If both end  WAN devises are Cisco then you can use HDLC, else use PPP.

It depends on the network connection you can use or you want to use.. but mostly PPP used .

Both PPP and ATM but PPP is recommended.....

 PPP is mostly used for dial-up (async) services, 

Please do not freak out because ATM is an answer to this question. 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.

PPP is the most correct answer. Also ATM can be used. But, It's less use since PPP is so efficient. 

PPP & ATM ........................