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→Part 2: How do we Manage Runlevels?
Running Linux servers in graphical mode can make the server vulnerable to penetration (i.e. a potential break-in to the server from unauthorized intruders). 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 '''Linux server''' (for security reasons since those servers are closest to the router and the Internet).
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 you will still encounter this is what the terminology in industry is using.
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