comptia a complete study guide 2012 pdf free download

... bidirectional parallel port has one important advantage over a standard parallel port: It can both transmit and receive data. These parallel ports are capable of interfac- ing with such devices as external ... and Characteristics of Adapter Cards An adapter card (also known as an expansion card) is simply a circuit board you install into a computer to increase the capabilities of that computer. Adapter ... multithreading (SMT). SMT takes advantage of a modern CPU’s super- scalar architecture. Superscalar processors are able to have multiple instructions operating on separate data in parallel. HTT-capable...

Ngày tải lên: 10/08/2014, 12:21

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... aspects and importance of safety and environmental issues Identify potential safety hazards and take preventative action Use Material Safety Data Sheets (MSDS) or equivalent documentation and ... upgrade and optimize hardware, software and data security for example:  BIOS  Smart cards  Authentication technologies  Malicious software protection  Data access (basic local security ... you’ll find sample exams for each of the A+ exams. Take these practice exams just as if you were actually taking the A+ exams (without any reference material). Depending on what edition of...

Ngày tải lên: 10/08/2014, 12:20

... commonsense approach: They designed their handhelds to use standard AA batteries. Most notebook computers can also use AC power with a special adapter (called an AC adapter) that converts AC power into ... examining some preventative maintenance recommen- dations and issues. Exam Essentials Know how many pins an IDE/PATA/ATA-5/ATA-6 cable has. A cable for use with these technologies has 40 pins. You’re ... Another primary concern is heat. Restricted space means less airflow, meaning parts can heat up and overheat faster. To overcome space limitations, laptop parts are physically much smaller and lighter,...

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... the administrator. 3. If updates are available, they are downloaded automatically in the background. 4. Once the updates are downloaded, Windows Update notifies you that the download is complete ... you make a backup, ensure that you can read from it. If you’ve just backed up a small amount of data, restore it to an alternate location and make sure you can read it. If you are backing up ... HAL, or the Hardware Abstraction Layer, is the translator between the hardware and the operating system. 20. B. Task Manager will show you a list of running processes and applications and allow...

Ngày tải lên: 10/08/2014, 12:21

... and wide area. Local wireless is usually available within a particular room or building only. Once you leave that area, it is no longer available. Local wireless has an operating range of around ... through a layer, the layer tacks its information TABLE 8.1 Topologies—Advantages and Disadvantages Topology Advantages Disadvantages Bus Cheap. Easy to install. Difficult to reconfigure. Break in ... data, and controls the flow of data. It can also receive and translate data into bytes for the CPU to understand. It communicates at the Physical layer of the OSI model and comes in many shapes...

Ngày tải lên: 10/08/2014, 12:21

... potential safety hazards and take preventative action  Use Material Safety Data Sheets (MSDSs) or equivalent documentation and appropriate equipment documentation  Use appropriate repair ... body and keeps it at a zero charge. Figure 10.3 shows the proper way to attach an anti-static strap. There are several varieties of wrist straps available. The one in Figure 10.3 uses a banana ... in any way for exercising their rights under the Occupational Safety and Health Act. Safety Plans It’s recommended that your company create and follow a workplace safety plan. Having a safety...

Ngày tải lên: 10/08/2014, 12:21

... were all the rage a few years ago and are still popular today. Also readily available are infrared keyboards and printers. Perhaps some of the most useful infrared devices are keyboards for PDAs. ... occur and the device is unavailable. Certain DMA channels are assigned to standard AT devices. DMA is no longer as pop- ular as it once was, because of advances in hardware technology, but it is ... access (DMA) allows a device to bypass the CPU and place data directly into RAM. To accomplish this, the device must have a DMA channel devoted to its use. All DMA transfers use a special area of...

Ngày tải lên: 10/08/2014, 12:21

... several years ago. Calibrating Scanners Scanners may need to be color calibrated with the monitor so that what scans in is accurate to what’s on screen. Many include a test pattern that can be ... active partition. Often this is also a primary partition and the first partition created on a hard drive. 4. D. A logical partition is any partition that has a drive letter. It can be primary, active, ... fixed easily, or the fix may result in only a temporary solution. Usually such a case calls for a complete formatting and reinstalla- tion of the OS and applications, and restoration of data. However,...

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Ngày tải lên: 10/08/2014, 12:21

Ngày tải lên: 14/08/2014, 20:20

Ngày tải lên: 14/08/2014, 20:20

Ngày tải lên: 14/08/2014, 20:20

Ngày tải lên: 14/08/2014, 20:20

Ngày tải lên: 14/08/2014, 20:20

Ngày tải lên: 14/08/2014, 20:20

Ngày tải lên: 14/08/2014, 20:20

Ngày tải lên: 14/08/2014, 20:20

... electrical charge? A: Capacitor 419. A parity error usually means a problem with? A: Memory (RAM) 21 A: Perform a full backup 254. What is the cheapest way to access the Internet? A: Dial Up access 255. ... of RAM and what? A: A swap file 445. Memory that is paged out to the hard drive is known as what? A: virtual memory Congratulations!! You have purchased one of the Troy Technologies USA Study ... AUTOEXEC.BAT? A: DOSKEY 40. Which allows faster access; RAM, ROM, or virtual memory? A: RAM 41. What batch file command will stop a batch file operation until a key is pressed? A: PAUSE 42. What...

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