Businesses in network and data communications design, install and maintain the systems that allow computers, devices and services to exchange information. Work may include planning network layouts, installing structured cabling and fibre-optic links, setting up routers, switches and wireless access points, and connecting offices, buildings or remote users. Some also provide network equipment and configuration for internet access, file sharing, cloud services, voice calls and video conferencing. Customers may use these businesses for network assessments, upgrades, fault diagnosis and performance improvements, as well as ongoing monitoring and technical support. Services can include configuring firewalls and access controls, separating networks for different users or purposes, and helping protect data in transit.