Final answer:
The most common cause of network failure is equipment failure, followed by storms, human error, and cable breakage.
Step-by-step explanation:
The most common cause of network failure is equipment failure. When network routers, switches, or servers malfunction or stop working, it can lead to network failures. Equipment failure can be caused by various factors such as overheating, power surges, or component damage. It is crucial to regularly maintain and replace outdated or faulty equipment to prevent network failures.
While storms can also cause network outages, especially if the infrastructure is damaged or power is lost, they are not as common as equipment failure. Human error, such as misconfigurations or accidental cable disconnections, can also lead to network failures. Lastly, cable breakage can disrupt network connectivity, particularly if the cables are damaged or poorly installed.