When setting up a cable modem, which of the following is typically required?

In the setup of a cable modem, having an existing cable television service is typically required because cable modems utilize the same coaxial cable infrastructure as cable TV. This existing service ensures that the necessary signal is already available in the home, allowing the modem to connect to the Internet service provided by the cable company.

The modem transmits and receives data over the coaxial cable, which is why the connection to a cable television service is essential. Without this service, the modem wouldn't be able to access the Internet, as it relies on the data provided through the cable system.

While other types of connections such as power or fiber optic lines may be involved in different contexts or setups, they do not specifically pertain to setting up a cable modem in the way that an existing cable television service does.