Servers, Networking, AD, DNS, Virtual Machines, Cloud, Backup Working as System and Network Administrator : Managing and Maintaing of Servers - 2012, 2008, 2003 Servers, AD, DNS, DHCP, IIS, Networks, Routers, Firewalls, L3 Switches, MTA, PMTA, Campaign Management, NAS, Installations (Hardwares and Operating Systems), Clustering, Edge Water, IP Phone, etc