What is the maximum number of devices that can be connected to a single USB 2.0 hub?

A single USB 2.0 hub can support up to 127 devices. This total includes the hub itself and all devices connected to it. The USB architecture allows for a hierarchical structure where one USB controller can manage multiple devices through hubs. Each hub can connect additional devices, but the USB specification limits the entire system to a maximum of 127 devices in total. This allows for substantial flexibility and expandability in USB setups, making it easy to connect multiple peripherals such as keyboards, mice, or external drives through hubs without exceeding the allowed limit. The other figures presented in the options exceed the limitations defined by the USB 2.0 standard.