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[[Image:grub2_1.png|thumb|right|600px500px|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". ]]