Free- Exam Objective 3.6 – Dumps4shared

A plus 220-1001 – Exam Objective 3.6

A+ Exam Objective 3.6

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3.6 Explain the purpose and use of various peripheral types.

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Welcome to Exam Notes by Dumps4shared! In this article, we
will cover Core 1 objective 3.6 Explain the purpose and use of various
peripheral types.

Printers

Printers create hard copies of the content displayed on your
computer’s display. This can be as simple as printing a note from your word
processor. On the other hand, you can also take a screenshot of your display
for troubleshooting purposes. There are several types of printers you are
expected to know for the test.

You will be expected to know these different types of printers
and how they operate.

Impact printers or Dot matrix use the impact
method to create paper prints.

Inkjet distributes fluid ink on the paper by ejecting small
amounts of colored dye from small ink containers.

LaserJet uses the electromagnetic properties of
the ink, the drum, and the fuser to create the most stable output type.
Moisture does not cause LaserJet prints to distort unlike other types.

ADF/flatbed scanners

Multi-function devices combine useful technologies into a single
device. You may initially see an inkjet printer and on closer examination see that
it is also a flatbed scanner. The scanner may have automatic document feed
(ADF) which allows you to scan multiple documents and then either print them or
save as a file on the network.

Scanners and Barcode readers

Practically all products sold today have a barcode somewhere on
their packaging. The arrangement of the bars provides specific product
information which is read by the barcode reader and passed onto a cash register
or other payment device. This practice has been so successful that companies
found that by changing its format, they could add more information to the
barcode such as web links to the manufacturer’s web page. The QR (Quick
Response) code was developed to satisfy this need and is read by the consumer
using their smartphone. It is not unusual to see a shopper reading a QR code
and comparing products using their phone.

Optical

DVD-ROM / DVD-RW / DVD-RW DL

The same principles that apply to CD-ROMs apply to DVD-ROMs,
DVD-RWs, and DVD DLs. The capacity of the DVD disc increased to 4.7 GB. This is
accomplished by increasing the density of the pits and lands while still using
a red laser. It was discovered that the capacity of the DVD-ROM could be
doubled to 8.5 GB by using two layers of recordable dye. The laser can then focus
on one layer at a time. All of the DVD drives discussed will be either internal
(PATA/SATA) or external. 

Keyboard/Mouse

We start out with the keyboard and mouse. Believe it or not, the
first consumer grade PCs did not have a mouse or even a graphical interface!
Everything was command line driven. Originally, mice were connected through the
serial port. They then upgraded to PS/2 and then ultimately to USB.

Keyboards followed roughly the same path. However, keyboards were
originally connected using an XT connector, a DIN connector that was twice the
size of the PS/2. Keyboard design evolved from an alpha numeric rectangular
device, which reportedly caused fatigue and nerve damage after extensive use,
to a curvy ergonomic design that was more natural. Newer keyboards and mice are
wireless, allowing for user mobility during gaming and home theatre aplications.

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Touchpads & signature pads

How do we navigate through our operating systems without using a
mouse? For 99% of situations, the solution is the touch pad. We will look at a
well-worn laptop touchpad to illustrate how the device is used. Most of the
action takes place at the large top section of the touchpad. Here, your
fingertip uses capacitance to change the electrical properties of the touchpad,
allowing you to navigate around your desktop using the touchpad surface.

Touchpad

Notice how centered the wear pattern which indicates a well
configured pad. Left and right clicks are physical actions, requiring you to
push down on the buttons. This can be considered a form of biometric input
because the electrical properties of your fingertip create the connection point
that influences the motion. Biometrics are most often found in security
enforcement situations where an individual’s biological properties are used to
identify them in a more definitive way than with a token or passphrase.

Signature pad

Another type of touch sensitive device is the glass-in signature
pad. The signature pad, otherwise known as the digitizer, is composed of a
three-piece electronic sandwich where the glass is the top layer. By pressing
on the top layer with a stylus, you can electronically authorize a transaction
with your digital signature.

Signature pad

• Monitors

Not so long ago, computers used CRT monitors to display graphical
output. CRTs were bulky and heavy. A 22” CRT weighed over 50 pounds. LCD
displays were first used in laptops and proved to be suitable for desktops. LCD
technology is able to produce higher resolutions than CRTs and a 22” LCD can be
carried with one hand.

Useful peripherals

Broadband access, now available to most users, made long
distance meetings commonplace. In addition to your PC, all you need is a webcam
and a microphone. If you have a newer laptop or a tablet, the webcam and
microphone are built in. If not, your best bet is to get a USB webcam and
microphone. Other items designed to make your life easier is the digital camera.
There’s probably one built into your smartphone.

You can take the digital memory card in your camera and transfer
your pictures to your PC using a smart card reader. This is also true of movies
you create with a camcorder.

Gaming

OK! Enough of the boring stuff. Let’s play a game! Let’s
talk about a First Person (that’s you) Shooter (what you have in your hand)
(FPS). In an FPS game, you walk around, shoot things, and collect items. To
navigate and perform actions, you will use your mouse and keyboard at the
minimum. You may also need a Game pad or a USB Joystick. Now let’s get some
action.

The same first person shooter mentioned above can be moved
into the virtual environment. Virtual reality (VR) headsets provide an
immersive visual environment for gaming. Broadband internet allows multiplayer
gaming and enables players to communicate and form teams using headset
microphones, ear buds, and speakers. VR headsets are now being used for police
and military training to combine safety with immersive virtual reality
environments.

VR headset

Joystick & Gamepad

• Projector

One display type you may encounter is the projector. Screen
output is backlit and projected onto a screen or even a clean white wall. This
gives a great deal of control over the size of the projected image.

Brightness and lumens

The brightness of a display is measured in lumens and is the
measurement of the candle power produced by an object. Let’s say lumens =
brightness and more lumens is usually better. A low cost monitor, sufficient
for office productivity, can be rated as low as 250 lumens while a high
performance CAD/CAM or gaming monitor can be rated in the tens of thousands of
lumens.

• External storage drives

Hot swappable drivesprovide
storage flexibility for PCs and laptops through an external interface that
allows hard disks to be added or removed without the need to power down the
machine. Originally this was a complex operation, but the introduction of USB
and SATA technologies combine to make this a reasonably safe process. The
configuration can be a single drive or an enclosure that houses multiple drives
that can be swapped in and out as necessary. It is a good idea to check the
write caching status on your drive dock that you intend to swap drives on. This
is disabled by default but it’s best to turn this on to allow recovery of last
data. You will find this setting in Device Manager in the properties of the
device.

KVM Switch

KVM stands for Keyboard Video Mouse. A KVM switch saves space by
allowing one keyboard, monitor, and mouse to be used across multiple PCs. You
can switch from one PC to another by simply pressing a button.

Magnetic reader/chip reader

ID badges

Security badges contain coded data that identifies you to the
security system and includes a current picture and personal security
challenges. Your security data can be stored on a magnetic strip or NFC
contactless storage. The card should also have the company logo and be
tamperproof. NFC is also the technology that supports tap and pay transactions.

Smart cards

Smart cards are another way to deliver security tokens to the
system. Smart cards may or may not be combined with badge technology. One thing
that separates many smart cards from other tech is its ability to both send and
receive data. This enables mutual authentication, allowing each component to
trust the other. Smart card readers scan for smartcards in range. When one is
detected, communication can begin.

Smartcard

Well that’s it for objective 3.6. Stay with it! Good luck on the test!

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