CompTIA A+: Working with Peripheral Devices Flashcards
Describe some features of a Lazer printer
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
Dot matrix printer features
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
Thermal Printer features
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
What are the two methods of Flatbed SCanners
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
How do Barcode Scanners work?
it really is just converting the light impulses to electric signals by decoding the pattern of black and white bars
Types of Barcode Scanners
LED
Lazer
Omni-directional: uses starburst pattern (straight and angled lines) - common in airports
Cathode Ray Tube Monitors features
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
liquid crystal display Moniors features
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
Virtual REality features
simulated environment that typically implements separate imaging for each eye
Common in flight simulations, design and medical training
what are the VR peripherals?
head motion tracking and body motion tracking,
game controllers
External Optical Drives features?
one common scenario is if you have a laptop and keeping the weight down you use an external drive
Mice and Keyboards types of connections
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
Touchpads and Signature Pads
So it’s typically integrated right onto the surface of the device itself, and generally does not take up much space.
What is wattage vs lumens in a projector?
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.
External Storage Devices desktop vs portable
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
External SSD Features
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.
Network Attached Storage features
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.
KVM SWitch - keyboard video mouse switch
purpose and types
DDM
Semi- DDM
Emulated KVM
Hub Base
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
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?
Exposing
On which type of system would you most likely find an external optical drive?
A newer laptop computer
Game controllers would most likely connect to your computer using which type of interface?
USB
In which scenario would you most likely find a KVM switch being used?
A network administrator managing several network servers
