I have some basic background knowledge of Linux in general as a user.. and have managed webservers that run Ubuntu Server Edition, but just day-to-day stuff.. httpd.conf edits, FTP setup, using apt-get, etc. My work wants me to learn Redhat Enterprise 5 because that's what our servers run, so I can help take the load of administering them.. they're going to send me for the Redhat certification, but I want to get a head start. They've given me a VM of RHEL5 to play with, but i'm seriously lost. Recommend me a book that covers basics + more? Everything I find is pretty advanced stuff.. I'm more interested in the package management, basic network setup/config, keeping it up to date, that sort've thing..