Linux Administration- OS (Debian, RedHat, Solaris) & related distributions- Ldap (OpenLdap)- Web Server (Apache/Tomcat)- File Server (Samba)- DB Server (MySql, Oracle)- Mail Server (Postfix, Dovecot)- Monitoring (Nagios, Cacti)Windows Administration- OS Desktop (98se, Milenium, XP,Vista,7)- OS Server( NT4.0, 2003, 2008)- DB Server (MSSQL 2000, 2005, 2008)- Mail Server (Exchange 2003, 2007, 2010)- Office + Tools ( 97, 2000, 2003, 2007, 2010)- Antivirus ( Kaspersky, AVG, Avira, NOD32)- Backup (Acronis)Data Networks Administration- Cisco Switching (3500xl, 2950, 3400me)- Cisco Routing (2600, 2800, 7600)- SOHO (D-Link, Linksys, Airlive, Planet, Thompson and others)- Alcatel Switching (OmniSwitch 6200, 6400, 6800)- Alcatel Routing (OmniAccess 700)Telco Networks Administration- Alcatel (OXO, OXE)- Cisco (AS5400XM)- VoIP (Asterisk, Openser)