Whether they are local, mobile, wireless, or virtual, networks are essential because they connect users and all of the company’s resources to one another. Networks require a great deal of administration, monitoring, and maintenance to ensure optimal availability. Their quality of service depends on the proper integration of routers, switches, antennas, and other network equipment from manufacturers, as well as the company’s application needs. Infrastructure security must be a concern at all times (auditing, intrusion tests, etc.), along with hardware and software protection (firewalls, strong authentication, VPNs, etc.). Networks and their technologies are constantly evolving, bringing about new types of jobs and new needs, which require constant monitoring in order to stay informed and avoid missing any opportunity. Finally, video surveillance also plays an important role in security. Network-connected cameras are equipment just like any other, and the skills needed to hook them up to the network, store their video, and maintain them should not be neglected.