McDst Self-Paced Training Kit (Exam 70-272(c) Supporting Users and Troubleshooting Desktop Applications on a[... ]ystem)

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

Key Points

• If you are working with a computer that has older serial-based devices such as modems, a common problem is that different serial devices may be configured to use the same system resources (resources such as IRQ numbers). If a mouse or modem is not recognized by Windows, or if the mouse pointer behaves erratically when using a modem, use the Input Devices and Modem troubleshooters available in the Help and Support Center.

• When faced with a device that is not working as expected, start troubleshooting from the highest interface level (the application) and work your way to the lowest level (the device itself). Check application configuration, then Windows configuration, then the device driver or other software, then the port, then the cable, and then the device.

Key Terms

802.11b wireless connection An industry standard for communicating through a wireless network. These network connections support a maximum bandwidth of 11 Mbps.

basic input/output system (BIOS) A computer’s BIOS program determines in what order the computer searches for system files on boot up, manages communication between the operating system and the attached devices on boot up, and is an integral part of the computer.

IrDA Short for Infrared Data Association, a type of port installed on newer computers, printers, and other devices that allows them to communicate wirelessly. IrDA ports transmit data at about the same rate as a parallel port does, and the devices must be in close proximity and have a clear line of sight between them.