When troubleshooting a cable modem, which of the following actions is commonly recommended?

Restarting the modem and checking the connections is a common troubleshooting step for cable modems because it addresses some of the most frequent issues encountered. Power cycling the modem can resolve connectivity problems caused by temporary software or hardware glitches. This process allows the device to reset its internal operating system, clear any potential errors, and re-establish a connection with the network.

Additionally, checking the connections ensures that all cables are securely attached and functioning properly. Loose or damaged cables can lead to poor signal quality or connection drops, and ensuring everything is connected correctly can often fix these problems without the need for further intervention.

The other actions listed might not provide immediate relief for connectivity issues. Upgrading to a fiber optic modem is not a troubleshooting step; it would be a consideration if the current modem is inadequate for the services being used. Switching the internet service provider without diagnosing the existing service may not resolve the problems being experienced if the issues lie with equipment or settings rather than the provider itself. Similarly, removing cable TV service is unrelated to troubleshooting a cable modem, as the two services may operate on shared infrastructure but do not directly affect each other's functionality regarding internet connectivity.