Which of the following is a common cause of network disruptions in a business telephone system?

Inadequate network bandwidth is a common cause of network disruptions in a business telephone system because it directly impacts the system's ability to transmit voice and data effectively. When the available bandwidth is insufficient to handle the volume of calls or the data being transferred, users may experience issues such as dropped calls, poor audio quality, or complete inability to connect.

This is particularly relevant in environments where many calls or intensive data applications are concurrently used, highlighting the importance of ensuring that the network infrastructure can support the expected load. Prioritizing bandwidth allocation for voice traffic is also essential, as voice over IP (VoIP) systems require more dedicated bandwidth to maintain call quality without interruptions.

Other causes, while they can occasionally lead to disruptions, are less prevalent or not as impactful in the context of everyday network operations. For instance, incorrect time zone settings may cause confusion in scheduling or time-related functionalities but wouldn’t typically prevent a phone call from being placed or received. Weather conditions can affect certain wireless communications, but they are not as significant a factor in most commercial telephone systems relying on wired infrastructure. Faulty office equipment can certainly cause issues, yet these typically relate more to hardware failure or maintenance rather than the capacity or efficiency of the network itself.