Exam Highlights

Before taking the exam, review the key topics and terms that are presented in this chapter. You need to know this information.

Key Points

• Some USB hubs are self-powered, and some are not. Hubs that are not self-powered draw power from the hub to which they are connected or from the computer itself. If you find that a USB device connected to an unpowered USB hub is not working as expected, try replacing the unpowered USB hub with a self-powered hub.

• If a user is experiencing intermittent display problems, such as garbled text, problems with the mouse pointer, or more severe problems, troubleshoot by reducing the level of hardware acceleration.

Key Terms

Advanced Configuration and Power Interface (ACPI) An open industry specification that defines power management on a wide range of mobile, desktop, and server computers and peripherals. ACPI provides for the OnNow industry initiative that allows computer manufacturers to configure a computer that will start at the touch of a keyboard. ACPI design is essential to taking full advantage of power management and Plug and Play.

Advanced Power Management (APM) An advanced Plug and Play that is designed to support battery status, suspend, resume, and autohibernate functions.

universal serial bus (USB) An external serial bus developed to provide a fast, flexible method of attaching up to 127 peripheral devices to a computer.