Internet fails

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http://forums.fedoraforum.org – I just installed Fedora11 but can't access the internet. I'm not sure where to start. Any suggestions? I do know I can access my work server. I have been given an ip address. I had no problems with earlier versions of Fedora(4-9). I open firefox and get the standard network not found error. I've encountered 3 computers that will not access the internet using FC11. (HowTos)