802.1x Wireless versus Wired authentication ?

Hi,

I'm learning Wireless NPS configuration. Tings are confusing for me and I have couple of questions. The article below seems to be a good article for understanding Wireless authentication complex features, but it is a little bit conusing for me : http://technet.microsoft.com/en-us/magazine/2007.11.cableguy.aspx.

My questions :

1) What is the difference between 802.1x Wired and Wireless domain authentication processes ?

2) Could someone help me get a basic understanding of Wireless Single Sign On on a domain authentication ?

3) Could someone give me get a basic understanding of bootstrap profile on a domain authentication ?

I have read couple of books and articles. Unfortunately ; none of them gave me a clear understanding on the subject.