Windows 7,8,10, Mac OS X , Ubuntu, Debian, Centos installation and configuration; Nginx, Apache, proxy and web server installation and configuration; Active Directory, DNS, DHCP, Print,Mac OS X Server, etc; Microsoft Exchange 2010; VMware ESXi, 6.5 installation, Configuration, Troubleshooting; vCenter Server Appliance; IBM Storwize 3700; Servers monitoring with Check MK; McAfee ePolicy Orchestrator Server administration; 3CX Phone System Manager, Cisco IP Phone, Polycom HDX 8000; Cisco switches and routers; Cisco 5520 Wireless Controller; Check Point firewall; UPS Eaton and Socomec;