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Saturday, November 24, 2007

Printers and Scanners: Cordless and Infrared Connections

What provides for a cordless connection to a printer?
1. IEEE 1394
2. Parallel
3. >>Infrared - Correct
4. USB
Explanation : Many laptops have infrared (IR) ports to allow you to connect to peripherals without a cable. To use the IR port, you must configure it first. Windows usually treats the IR port as a serial port, but it also assigns it a virtual COM port and LPT port.

You need to know which simulated port Windows has assigned to the IR port to configure printing. You must line up the IR port on the laptop and the printer or other device to establish a connection. IR works by line-of-sight, so the IR ports on the laptop and device must be able to "see" each other.

Universal Serial Bus (USB) has become the most popular way to connect peripherals of many sorts, including printers, to modern Windows PCs. USB is faster than serial and parallel ports. Printers have traditionally used a parallel connection, but they can also use the USB or IEEE 1394 Firewire interfaces to connect to printers if the printers support it. Many printers today have USB and parallel interfaces, but few have Firewire interfaces.
Objective: Printers and Scanners

Essentials: Environmental Variables

As part of preventive maintenance, you want to review the computer's environmental variables.
How can you retrieve this information? (Select TWO.)

1. By running the set command from a command line prompt -Correct
2. >>Through System Tools in Computer Management - Wrong
3. >>Through the Advanced properties in the computer's System properties Correct
4. Through the View tab in Folder Options
5. By running the attrib command from a command line prompt

Explanation : You can view a computer's environmental variables through the Advanced properties in the computer's System properties or by running the set command from a command line prompt. You can launch the System properties from the Control Panel, select the Advanced tab, and then click Environmental Variables to view and modify environmental variable settings. The set command, when run without any other options, returns a list of environmental variables and their current values.

You cannot view a computer's environmental variables through System Tools in Computer Management. System Tools includes Event Viewer, Shared Folders, Local Users and Groups, Performance Logs and Alerts, and Device Manager. None of these allows you to view the environmental variables.

You cannot view environmental variable settings by running the attrib command. The attrib command lets you view and modify file and directory attributes. The attrib command lets you set or clear file and directory attributes. The supported attributes are:

+r/-r - Sets or clears the read-only attribute.
+a/-a - Sets or clears the archive attribute.
+s/-s - Sets or clears the system file attribute. +h/-h - Sets or clears the hidden file attribute.

You cannot view a computer's environmental variables through the View tab in Folder Options. The View tab lets you set advanced file options, such as viewing hidden and system files or setting the file sharing method used. None of the options deals with viewing environmental variables.
Objective:
Operating Systems