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A cable internet customer can use just a modem if they are connecting a single device to the Internet, such as a desktop computer. Many customers now have a plurality of devices they would like to connect to the Internet at once, such as video game consoles, televisions, media centers, laptops, tablets, computers, and phones. In this case, a device that operates as a router is necessary.

The modem provides connectivity for a single device to the Internet, while the router provides a network to many devices in the same area; the combination of the two allows many devices to access the Internet at the same time. Cable operators may now provide a single device that operates as a modem and a router, in which case, only one device is necessary, since it fulfills both roles at once. Technically, the customer still has a modem and a router, but it is housed in a single device, reducing power usage and providing a smaller footprint.

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Q: Do you have to use both a modem and a router together?
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