TestOut LabSim A+ Certification Practice Exam

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How many IRQs are needed for devices connected to a USB hub?

The correct answer is: 1

In the context of USB hubs, only one Interrupt Request (IRQ) line is required for all devices connected to the hub. USB is designed to be an efficient and flexible means of communication between the host and multiple peripheral devices. This architecture allows a single IRQ to manage multiple devices, reducing the complexity and increasing the efficiency of the system. When a USB hub is connected to the computer, it essentially operates as a mediator between the CPU and the connected USB devices. The hub will handle the communication and data transfer, and it is responsible for monitoring the status of the devices. When a device needs to communicate, it sends signals through the hub, which then uses the single IRQ to notify the CPU of any incoming data. This design allows for seamless communication without the need for separate IRQs for each connected device, allowing the system to manage resources more effectively.