Why the default eth0 interface is down by default on CentOS?

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http://unix.stackexchange.com – I am already a little bit familiar with Linux distros like Debian or Ubuntu (yeah, very similar) but I wanted to try Red Hat based - CentOS 6.2 . I have installed it on my Windows 7 host in virtualBox and tried to play with it a little. I have same across a small problem, namely : the default eth0 interface is down by default. I use the option with NAT ( the virtual machine is 'behind' the host ). Even if I bring the interface up with ifconfig eth0 up it does not work right away. I get this after bringing the interface up: What should be done more to configure the network on CentOS machi (HowTos)