I am a network administrator by trade specializing in Linux and Windows server environments and hosting.
I have 6 years experience in Linux server environments including the following but not limited to these :
RedHat Enterprise Linux 5 / 6 / 7
CentOS 5 / 6 / 7
Apache / httpd
dns / bind / named
I also have more than 6 years experience with Windows desktop and server environments which includes but are not limited to :