USB Principals - USB Communications

Question 1

What is the discovery process of detecting, identifying, and loading drivers for a USB device?

Packet transfer

Enumeration

Configured state

Stream pipe

Answer 1

Enumeration is the discovery process of detecting, identifying, and loading drivers for USB devices.

Question 2

Most USB transactions begin with a ______ sent from the host controller to a device on the bus.

Token packet

Bulk data transfer

Special packet

Message pipe

Answer 2

Most USB transactions begin with a token packet sent from the host controller to a device on the bus.

Question 3

To ensure a USB bus will support all of the connected peripherals, it should not exceed the ______ cascading hub limit.

One

Three

Five

Seven

Answer 3

To ensure a USB bus will support all of the connected peripherals, the bus should not exceed the five cascading hub limit.

Question 4

Which of the following has peripherals and a hub enclosed in one package? For example, a keyboard and trackpad in one enclosure with one USB cable.

Composite USB device

Compound USB device

Control Pipe

Data Pipe

Answer 4

A compound USB device has peripherals and a hub enclosed in one package. For example, a keyboard and trackpad in one enclosure with one USB cable.