LITMIR.BIZ

137

A, B, C. The ATX, MicroATX, and mini-ITX motherboard form factors can all be mounted inside a standard ATX case. The mini-ITX will have only three of the four mounting holes line up with the case, but the rear interfaces are placed in the same location as those on ATX motherboards.

138

C. If memory supports ECC, check bits are generated and stored with the data. If one of the eight memory bits is in error, ECC can correct the error.

139

A, D. USB flash drives and SD cards are hot swappable. (In the case of USB, be sure that the flash drive does not contain key file system files needed for the computer to run!) Hybrid SSDs might or might not be hot swappable and are larger than USB and SD drives. PATA devices are generally not hot swappable.

140

C. This SLI-ready motherboard has three PCIe x16 slots (every other slot, starting with the top one), one PCIe x1 slot (second slot from the top), and two PCI slots (first and third slots from the bottom). Notice the latch and tab that secures the x16 adapters in place by their hooks.

141

B, D. Dual-channel motherboards have two banks of two RAM slots. They are color coded such that the two slots of the same color belong to the same channel. Sometimes the like-colored slots are adjacent to each other, but other times they alternate. For optimal performance, fill one channel completely.

142

C. Install an application that provides support for printing to .pdf. Then, when the user opens the print window, they can choose the .pdf option.

143

A. The boot sequence of a computer is changed in the BIOS settings.

144

C, D. Typical front- or top-panel connectors include USB, audio, power button, power light, drive activity lights, and the reset button. Hard drives and optical disk players generally connect to the motherboard.

145

A. USB 3.0 has a cable length limitation of 3 meters. USB 2.0 cables can be up to 5 meters in length.

146

C. Printer firmware upgrades can offer newer features that are not available on previous versions.

147

D. PCI is a shared-bus topology, so mixing 33MHz and 66MHz adapters in a 66MHz system will slow all adapters to 33MHz.

148

B. In the exposing step, the image is written to the photosensitive imaging drum. Wherever the laser beam touches, the photosensitive drum’s charge is severely reduced from –600VDC to a slight negative charge (around –100VDC). As the drum rotates, a pattern of exposed areas is formed, representing the image to be printed.

149

D. Passive cooling systems come in a variety of models, and some are very effective. The defining characteristic is that they do not use a fan or require a power source.

150

B. Compact discs have a capacity of approximately 700MB. Other CD standards support capacities of 650MB, 800MB, and 900MB.

151

A, C. The BIOS configures many hardware components and settings, such as system date and time, boot sequence, enabling and disabling devices, clock speeds, virtualization support, and BIOS security.

152

B, C. 64-bit SODIMMs come in 144-pin SDR, 200-pin DDR and DDR2, and 204-pin DDR3 varieties. DDR DIMMs have 184 pins, and DDR2 and DDR3 DIMMS have 240 pins.

153

A. The typical increasing order of capacity and distance from the processor die is L1 cache, L2 cache, L3 cache, RAM, and HDD/SSD. Currently, there is no L4 cache.

154

A. The picture shows a 20-pin ATX connector, which provides the motherboard with power.

155

A, D. A pin grid array (PGA) socket has holes to receive the pins that are on the CPU. The land grid array (LGA) is a newer technology that places the delicate pins on the motherboard instead of on the CPU.

156

C. To calculate the FSB speed from the RAM module name, divide by 8. In this case, that makes the FSB 1333MHz (accounting for a bit of rounding).

157

C. Organic light-emitting diode (OLED) displays can be made to be flexible, whereas other displays cannot.

158

C. A duplexing assembly is used for two-sided printing. After the first page is printed, it’s fed into the duplexing assembly, turned over, and fed back into the paper feed assembly.

159

C. The printer’s logic circuitry and motors require low voltages, between +5VDC and +24VDC. The DC power supply (DCPS) converts house current into three voltages: +5VDC and –5VDC for the logic circuitry and +24VDC for the paper-transport motors. This component also runs the fan that cools the internal components of the printer.

160

D. The top module is DDR3, and the bottom one is DDR2. Both have 240 pins and a single keying notch. The DDR3 notch is off-center.

161

D. Never ship a printer anywhere with a toner cartridge installed! The jostling that happens during shipping could cause toner to spill out of the cartridge and all over the inside of the printer. Remove the toner cartridge first. You can put it in a sealed, airtight bag to ship if needed.

162

D. Linear Tape-Open is the newest and highest-capacity tape storage technology. LTO 7, released in 2015, has an uncompressed capacity of 6TB per tape. LTO 6 had an uncompressed capacity of 2.5TB. QIC tapes can often store around 1GB. DLT can store up to 800GB, and DAT can store up to 300GB.

163

A. Most internal video adapters today are PCIe cards. You might still find older PCI or AGP cards on the market as well. ISA is a legacy expansion slot type not used today. VGA and DVI are types of monitor connectors but not expansion slot types.

164

D. The order of steps is processing, charging, exposing, developing, transferring, fusing, and cleaning.

165

A, B. Apple created Bonjour and AirPrint.

166

D. Before you print to an inkjet printer, you must ensure that the device is calibrated. Calibration is the process by which a device is brought within functional specifications. For example, inkjet printers need their print heads aligned so that they print evenly and don’t print funny-looking letters and unevenly spaced lines.

167

D. Desktop computers use dual inline memory modules (DIMMs), and laptops most commonly use small outline DIMMs (SODIMMs). Another potential laptop memory form factor is the MicroDIMM.

168

C. Thermal printers use a heating element. It heats up spots on special waxy, heat- sensitive paper to form the image.

169

A. When a laser printer requests maintenance, it’s because it has reached a certain page count. Apply a proper maintenance kit (one recommended by the manufacturer) and then clear the service message.

170

B. PCI-X slots are physically compatible with PCI adapters. Because all PCI-X slots support the 66MHz minimum clock rate, PCI-X slots are compatible with 66MHz PCI adapters.

171

C. There are dozens of peripherals on the computer market. Joysticks are used primarily to play video games. Barcode readers will scan item barcodes, such as items you purchase at a store. Motion sensors are usually associated with security systems. Smart TVs play television. Camcorders are another type of peripheral, used to record video.

172

B. Because bridges work at the Data Link layer, they are aware of only hardware (MAC) addresses. They are not aware of and do not deal with IP addresses. Bridges are more intelligent than repeaters, but they are unable to move data across multiple networks simultaneously.

173

B. An Ethernet splitter will take the incoming signal on two pairs and then split it, so on the output end it produces two sets of signals using two pairs each. Because of this, Ethernet splitters are limited to 100Mbps connections. It is not recommended that you use Ethernet splitters

Скачать книгу