Comacast uses Level 3 connections for all its networks. There isn't a content provider that does not use a level 3 connection. Level 3 connections are the largest backbone of the internet together with internet exchange points, in the world. we do, they have been called level 3 connections everywhere from old Distributed Network books to today's Centurylink articles. No one cares who owns the connections, we still call them level 3. "layer 3" Funny joke. But I know my network stuff, if you knew what level 3 was, you wouldn't have tried to correct me.