1. Check your IP address, netmask, default router and DNS servers. Write this information down ( or type it into a file if you don't have pen/paper )
2. Shut down networking using the proper init script
3. Manually configure networking by setting up your IP address and netmask, your default route, and your DNS servers from the information you gathered earlier.
4. Test that networking is functional by pinging yahoo.com
5. If networking isn't working, troubleshoot the problem and fix it.
6. Run some random traceroutes and familiarize yourself with the output
7. Obtain a listing of all your currently loaded kernel modules
8. Remove the parport module. You might have to remove something else to get this module removed..
9. Install the parport module again. Do it once with insmod, and once with modprobe. ( Removing in between )
10. Review the iptables manpage. Using your new knowledge, change the last rule of the "RH-Firewall-1-INPUT" chain from the REJECT with icmp-host-prohibited to a simple DROP action.
11. Change your default runlevel to runlevel 3.
12. Use any of the following commands in a single commandline ( with multiple pipes ) to obtain a short, alphabetized list of every user running a piece of software on your system: grep, uniq, sort, ps, awk, head. You might figure out clever ways using other commands, but the goal is to get the whole thing accomplished with one press of the enter key. ;) This one is pretty tricky, so try to work it out methodically, and refer to your manpages. And remember, "UID" is not a username, that's the heading of the user id column in the output of your ps command, so you need to remove it somehow, and using a grep -v is not the answer ( b/c it could remove a user named UID, slim chance of a user like that, but not impossible )
13. Using google, or a manpage, or the book, learn at least 5 new vi commands.