CompTIA A+: Working with Peripheral Devices

Question 1

Describe some features of a Lazer printer

Answer 1

Lazer:
use electrostatic digital printing with a lazer beam

offer both monochrme and colour printing

PROCESS: image processing prepares to be transferred to a photosysthetic drum.

charging uses what’s known as a corona wire to apply a uniform negative 600 volt charge to the drum

Question 2

Dot matrix printer features

Answer 2

and these work on an impact principle

whereby pins strike an ink-soaked ribbon onto the paper behind it and this is effectively the way that typewriters work

Remain in use because of its ability to produce multiple copies simultaneously

Question 3

Thermal Printer features

Answer 3

relies on heating thermal paper

They’re typically smaller and faster than dot-matrix, so they’re ideal for portable devices.

the common applications might still include a point-of-sale, maybe label printing, or maybe even at a gas station the receipt

Question 4

What are the two methods of Flatbed SCanners

Answer 4

it operates by reflecting light off of the image itself and measuring the intensity and the color.

Charged Coupled Device scanning: this actually uses a lens to reduce the image. So for all intents and purposes, it takes a picture of whatever you are scanning. And this typically can result in a higher quality, but is more commonly used for large format scanning

Contact Image Sensor scanner:
where this uses a moving set of three red, green and blue LEDs to measure, again, the intensity of each of those colors. And this typically is what you would find maybe in a home environment

Question 5

How do Barcode Scanners work?

Answer 5

it really is just converting the light impulses to electric signals by decoding the pattern of black and white bars

Question 6

Types of Barcode Scanners

Answer 6

LED
Lazer
Omni-directional: uses starburst pattern (straight and angled lines) - common in airports

Question 7

Cathode Ray Tube Monitors features

Answer 7

old-style monitor.
very large, very bulky, quite heavy

refers to the negatively charged aspect of the tube
a heated filament in a vacuum sealed glass tube that fired out electrons

Question 8

liquid crystal display Moniors features

Answer 8

it just has a flat screen.
It also has much lower power consumption compared to a CRT.
It’s very lightweight and can be made in a very compact small size

Question 9

Virtual REality features

Answer 9

simulated environment that typically implements separate imaging for each eye

Common in flight simulations, design and medical training

Question 10

what are the VR peripherals?

Answer 10

head motion tracking and body motion tracking,

game controllers

Question 11

External Optical Drives features?

Answer 11

one common scenario is if you have a laptop and keeping the weight down you use an external drive

Question 12

Mice and Keyboards types of connections

Answer 12

PS/2: cylindrical connector that was barely a centimeter in diameter, probably smaller than your pinky finger. And, in fact, the keyboard used the same connection, but they were usually color coded so you got the right one in the right place. But that was largely superseded by USB

USB

WIRELESS

BLUETOOTH

Question 13

Touchpads and Signature Pads

Answer 13

So it’s typically integrated right onto the surface of the device itself, and generally does not take up much space.

Question 14

What is wattage vs lumens in a projector?

Answer 14

wattage is just how much power is being consumed, not necessarily how bright it is. So lumens are exactly that, it is quite simply how bright is the output.

Question 15

External Storage Devices desktop vs portable

Answer 15

desktop external hard drive, which houses a 3.5 inch drive; (requires its own power supply)

portable external drive, which houses a 2.5 inch drive. (laptop device)

they typically use standard connections, such as USB 2.0, USB 3.0, or eSATA

Question 16

External SSD Features

Answer 16

Data is stored in non-volatile memory with a solid state drive, meaning that it does not require power to retain its data.

So as such, there’s no mechanical or moving parts. And this results in several benefits, including lower power consumption while still giving you a very reliable and robust storage mechanism.

And it operates much faster than hard disk drives do, because there is no spinning disk, there’s no moving parts whatsoever.

And this also translates into better reliability, there’s simply fewer components that can fail, because again, there are no moving parts.

Question 17

Network Attached Storage features

Answer 17

This is usually what you see in a network environment where there are very large demands on the storage.

So what you have is an array. You’ve got multiple hard drives, housed in a single enclosure, and essentially, that’s all it is. It’s just a big rack of hard drives, so as such, of course,

it’s not connected locally to a computer using a single cable, it’s accessed over the network.

in most cases, you will also see this combined with RAID, Redundant Array of Independent Disks. So that if you get a physical failure of a disk, you can replace that disk without losing any of the data.

Question 18

KVM SWitch - keyboard video mouse switch
purpose and types

DDM

Semi- DDM

Emulated KVM

Hub Base

Answer 18

allows multiple computers to be controlled by one set of peripherals

Hub Base Class: his essentially means that as you switch from system to system, the enumeration process is re-invoked every time.

Emulated class KVM: features are maintained when you switch form system to system: there was less latency when switching devics

semi- DDM devices: uses enchanced emulators and tech known as dynamic device mapping
- this supports any type of USB human interface device however doesn’t retain connections permanently across systems so there will be latency

DDM : dedicated fully functional emulators across all systems: maintains all functionality

Question 19

The process of a laser beam focusing on the drum to drain off the electrical charge happens in which stage of the laser printing process?

Answer 19

Exposing

Question 20

On which type of system would you most likely find an external optical drive?

Answer 20

A newer laptop computer

Question 21

Game controllers would most likely connect to your computer using which type of interface?

Answer 21

USB

Question 22

In which scenario would you most likely find a KVM switch being used?

Answer 22

A network administrator managing several network servers