Do I need built-in microphone/speakers on my computer to listen to the e-learning session?

No. In fact you will not be able to listen to the e-learning session through your computer speakers.  You will need to dial-in to the conference line to hear the sound portion.  You will be given a toll free phone number to call and a conference code in your registration e-mail. (note: toll-free numbers is avaialbe for US only; an international number is provided for those outside of the US).