Can you demonstrate infrastructure in a simple way?

How do you demonstrate most important part of IT ecosystem in a simple or graphical way, so people can understand it easily? I got that question quite often. Now I decided to illustrate some of my work in a virtual way by making myself a "portfolio". It will be very challenging, but I must give it a try!

I want to start with my latest engagement. "Linux Workstation with Red Hat Linux Workstation 6" for a cool company, who actually use RHEL as workstation, because users are smart, need more CPU and programming tools that Windows can not provide. This is a fully automated management solution. Ldap, kerberos, nfs, cachefs, you name it...