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For computers to interact with each other, they need to be "networked" together. IT networking is the discipline of ensuring that devices can communicate, both securely and reliably. In a home, an IT network may include a router, modem, laptop, desktop, smart television, game consoles, and smartphones. In an office, an IT network may consist of printers, fax machines, desktop computers, servers, phones, and more. Individuals who deal with IT networking are generally called networking professionals. They create, manage, maintain, and improve upon IT networks of all complexity levels—from very simple networks to very complex networks.