Computer network technicians establish, operate, maintain and coordinate the use of local and wide area networks (LANs and WANs), mainframe networks, hardware, software and related computer equipment. Web technicians set up and maintain internet, extranet and intranet web sites and web server hardware and software, and monitor and optimize network connectivity and performance. They are employed in information technology units throughout the public and private sectors. Computer network technicians who are supervisors are included in this group.