How To Install Or Update Gcc - Installing Gcc In Linux Tutorial Guide Shell Command

this command "yum install gcc", to install gcc does not work in my os, fedora 10. it says,
could not retrieve mirrorlist mirrors.fedoraproject.org/mirrorlis error was
[errno 4] ioerror: urlopen error (-2, 'name or service not known')
error: cannot retrieve repository metadata (repomd.xml) for repository: fedora. please verify its path and try again

please guide me. above command did not work and error shows
gathering header information file(s) from server(s)
server: red hat linux 5server - i386 - base
retrygrab() failed for:
mirror.dulug.duke.edu/pub/yum-repository/redhat/5server/i386/headers/header.info
executing failover method
failover: out of servers to try
error getting file mirror.dulug.duke.edu/pub/yum-repository/redhat/5server/i386/headers/header.info
[errno 4] ioerror: http error 404: not found

sorry. the above commmand not working and shows the error message as
gathering header information file(s) from server(s)
server: red hat linux 5server - i386 - base
retrygrab() failed for:
mirror.dulug.duke.edu/pub/yum-repository/redhat/5server/i386/headers/header.info
executing failover method
failover: out of servers to try
error getting file mirror.dulug.duke.edu/pub/yum-repository/redhat/5server/i386/headers/header.info
[errno 4] ioerror: http error 404: not found