A network engineer is a technology professional who has the necessary skills to plan, implement and oversee the computer networks that support in-house voice, data, video and wireless network services. As computer network designs, network engineers work with a company’s computer network, using information technology to make network systems for all employees to use. These data networks can include local area networks (LANs); wide area networks (WANs), WLANs (wireless local area networks), GANs (global area networks), SANs (small area networks), CANs (cluster area networks), PANs (personal area networks), DANs (desk area networks), VoIP, intranets and extranets. An average salary for network engineer is a standard one in freelance market place as well. The CCNA is a foundational certificate for those seeking a high level networking profession, as well as one of the most highly sought after certifications in the industry as a whole. Professionals in the field may work in a number of allied fields including as a freelancer, which applies to entry-level and veteran engineers as senior network engineer.