The following notes are for setting up networking and also a graphical desktop on a fresh CentOS 7 Installation.

Type nmtui command in your terminal to open Network Manager. After opening Network Manager choose “Edit connection” and press Enter (Use TAB button for navigation and space bar for selection).

Now choose you network interfaces and click “Edit”.

DHCP configuration:

Choose “Automatic” in IPv4 configuration, check “Automatically Connect” check box, press OK and quit from Network manager.

At the command line: service network restart

At the command line: ip a

At the command line: ping gooogle.com as a test.

Installing a GUI:

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sudo yum -y install epel-release  
sudo yum -y groupinstall "X Window system"  
sudo yum -y install lightdm  
sudo yum -y groupinstall gnome-desktop  
sudo yum -y install cinnamon  

To switch to graphical target, do the following:

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sudo systemctl isolate graphical.target  

Use Ctrl + Alt + F2 to open another console session.

After a reboot, the system will start with its default target (multi-user) so in order to make the change permanent and always start your system with a GUI, you can change the default target to the graphical one:

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sudo systemctl enable gdm.service  

and

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systemctl set-default graphical.target  

Reboot at command line:

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shutdown -r now