Advanced System Administration

Don't even think of doing any of this unless you have sufficient time and are an expert.

Making a very large disk - How to create a multi Terabyte partition
rdate server - quick one on how to get a node to serve up time for rdate use.
Named - the DNS (and MX records, i.e. email records) server running on einstein.
Iptables - The firewall that runs on each system.
LDAP - "Lightweight" Directory Access Protocol - Keeps our users, automounts, and systems lists.
NFS - Network File System - allows other computers to see your disks.

Advanced SysAdmin