Cannot enable network after CentOS 6.3 fresh install

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http://unix.stackexchange.com – I am trying to perform a fresh CentOS 6.3 installation then run various yum commands such as yum install httpd. The installation runs fine, however I cannot run any network based commands like yum I am aware the default installation has networking disabled. I have amended the /etc/sysconfig/network-scripts/ifcfg-eth0 file in accordance with this guide, but keep receiving the error Could not retrieve mirrorlist http://mirrorlist.centos.org?release=6arch=i1386&repo=os error was 14: PYCURL ERROR 6 - "Couldn't resolve host 'mirrorlist.centos.org'" Error: Cannot find a valid (HowTos)