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Definitive way to configure network devices in Centos 6.2

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http://unix.stackexchange.com – What is the definitive way to configure network devices in Centos 6.2? Via network manager or editing /etc/sysconfig/network-scripts? I have a notebook with 1 ethernet port and a usb ethernet adapter plugged in. When I do ip link show I see eth0 and em1. However when I go to /etc/sysconfig/network-scripts, there is an ifcfg-eth0 file and ifcfg-usb0, but no ifcfg-em1. The network manager applet shows under Wired connections System eth0 and System usb0. I have set eth0 to 10.0.0.1 and usb0 to use dhcp under the network manager applet. When I remove usb ethernet device, ip link show only show (HowTos)