LANs and WANs, network hardware (NIC, router, switch, hub), IP and MAC addresses, network topologies, wired vs wireless, the cloud and Wi-Fi/Bluetooth.
What a network is
A network is two or more devices connected together so they can share data and resources (files, printers, an internet connection). Benefits include sharing hardware/files, central management and communication; drawbacks include cost, security risks and dependence on the network.
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