Assignment - Tiers on the Internet

For this assignment we were to list several different companies that resided on Tier 1, 2 and 3 of the Internet Backbone within the United States of America.

Tier 1 ISPs:

1. AT&T
2. Level 3 Communications
   
3. Version Business
4. Quest
5. AOL

Tier 2 ISPs

1. Limelight Communications Inc.
2. Cogent Communications
3. nLayer

Tier 3 ISPs

1. D&E Communications
2. WideWorld