I have installed and administered all sorts of servers & applications including

Servers:
Linux (Routers and Firewalls)
Proxy servers
Load balancers
Windows (Servers and Domains)
Unix (Servers)
WebSphere
SQL
SharePoint
DB2

Protocols:
SMTP
LDAP
TCPIP
DHCP
SSL
IMAP
POP3
MAPI
TCP
UDP