I am a jack of all trades in the computer field.
Here a simple list of what I know:
Windows NT 4.0 server and workstation
Win 2000 server with active directory
Exchange mail server 5.5 and 2000
Windows XP pro
IIS 4.0 and 5.0 web server
nOOB at Linux 7.2 with Apache web services
nOOB at Linux 8.0 as DNS server and DHCP and firewall services
Cisco Catalyst switches 1900 and 2950's
Cisco 2501 & 2600 and 3600 routers
Cisco 5300 dial in routers
CSU/DSU's for our T1 lines
Then I worked as an optician( eyeglasses) and was the manager/lead tech of an optical lab. So I know how to grind the lens to people prescriptions if I have the right tools.
Before that I did apartment maintenace. So basic carpentry, electrical, and plumbing.
Of courese i do all the mechanical work on my car and bike. Like altanators, cluches, oil, and electrical crap.