Linux:- Patching,compiling, upgrading, webserver,server monitoring, webserver,squid proxy server,NFS,FTP, Samba, Mysql, Open Ldap, Server Backup, scripting,HTTP file server. Windows:- Active directory, Http File server, RDP configuration, WSUS server,FTP VMWare: Virtualization of resource, cluser configuration ,VCenter server, Vsphere webclient for managment and monitoring Firewall: configuration of Firewall, Website routing , Natting, VPN server ,load balancing