Maintenance, support, install and setup - MS Windows XP/Vista/7/8/8.1/10 Maintenance, support, install and setup - MS Windows Server 2003r2/2008r2/2012r2 Maintenance, support, install and setup - MS Office 2003/2010/2012 Maintenance, support, install and setup - Unix-base Systems, Maintance, support, install and setup - Elastix,FreePBX,Asterisk Configuring DHCP Server,DHCP Client, Subnetting, Windowse server VPN, Mikrotik VPN, Firewall, DHCP, Routing, VLans DNS adding CNAME, A, MX records SQL Database Server backup and installationWindows Terminal Server, RemoteApp Citrix XenServer management, VMware management, Proxmox Management