Here's just one chapter of a fine book on this.
http://www.ciscopress.com/articles/article.asp?p=169553&seqNum=3&rl=1
Get the book to see the rest.
As to question 2 I think you'll find that out as you learn about ATM.
Bob
Q1.is that can use the ADSL connect to ATM?
Q2.What difference between ATM and public Internet?

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