linux
php
mysql
apache
bash
open source
cisco
lan
wan
perl
it-security
router
firewall
vpn
checkpoint
solaris
sles
juniper
wiki
palo alto networks
ibm/iss-siteprotector
webwasher
hp-openview
extreme networks
intrusion detection system
netzwerkmanagement
switche
bs2000
transdata
x.400
numerische mathematik
barracuda / phion