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===Part 2: How do we Manage Runlevels?===
Running servers in graphical mode will make your system most likely to be penetrated. The X-windows framework can be vulnerable to attacks when these servers are connected to the Internet. This is why when you install server versions of Linux, they work in text-based mode only. Desktop versions of Linux are then installed on workstations (working in graphical mode) that connect to the server (for security reasons).
The Linux sysadmin can also change the run-level (or state) of a graphical Linux server to run in text-based mode and run the graphical mode by issuing a command when graphic mode is required. The run-level term is now deprecated in Fedora, and will likely be deprecated in RHEL/CentOS at some point as well, but for now this is what the industry is using.
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[[Image:grub2_1.png|thumb|right|600px|The purpose of '''Linux servers''' are to run network-based services (i.e. they '''"serve"''' the users that operating in that Linux/Unix system). It is common that these Linux servers are separated (for security purposes) and they are '''run in Command-Line mode only'''. Running these Linux/Unix servers in '''Graphics Mode will make them more vulnerable to penetration from hackers, etc.''' Therefore, it is common that the Linux servers are CLI <u>only</u>, but the Workstations that connect to them within the network are GUI. Therefore, it is important that a Linux/Unix system administrator understand to switch to these different "run-levels". ]]
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:'''Perform the following steps:'''
