Mobile Devices

Question 1

Authentication Devices (There are 5)

Answer 1

Something you know: username, password
Something you have: physical token, key fob, etc
**Something you are: **fingerprint, face scan
Something you do: how you sign your name, the way you speak
somewhere you are: location factor

Question 2

Examples of Wearable Technologies

Answer 2

Smart watches, Fitness monitors, VR Headsets, etc.

Question 3

What is Tethering and what methods allow you to do this?

1

Answer 3

Using mobile device’s cellular data to provide internet access to another device can be achieved using USB, Bluetooth, or Wi-Fi.

Question 4

What causes a mobile device’s cellular network to slow down?

3

Answer 4

• Mobile device reaches its data cap for a month. Service provider limits the amount of data transferred by users account over the cellular network.

Once data limit is reached…(either)
- Cellular data is slowed down
- Data stops completely

Question 5

OLED

10

Answer 5

Organic Light Emitting Diode.

What to look out for?
- Each pixel has it’s own separate LED light
- Can be made of plastic
- Can be folded, rolled up, or manipulated

Benefits
- Doesnt require separate backlight (No CCFL or LED)
- Better contrast ratios
- Can be thinner
- Less power intensive leads to longer battery life

Cons
- Maximum brightness not as bright as LCD (If in bright sun hard to see).
- Susceptible to burn in (Same static image being displayed)
- Turn off display or change display.

Question 6

Location Services

7

Answer 6

What to look out for?
3 Types
1. Course Positioning (Oldest): Rough guess, uses 3 towers.
2. Global Positioning: Consists of satellites and networks of ground stations.
- Most smart phones have
- Needs GPS receiver
-Enabled in settings
3. Indoor Positioning System (IPS): Allows a device to figure out location indoors.
- Bluetooth, RFID, Wireless networks, and cellular towers

Question 7

IPS

5

Answer 7

In-Plane Switching

What to look out for?
-Rotate

Benefits
- Great color accuracy and reproduction at a wider range of viewing angles
- Can be on almost on the side and still see (40 or 60 degrees)
- Response times close to TN displays

Cons
- Doesn’t support high refresh rates

Question 8

TN

Answer 8

Twisted Nematic (TN)

What to look out for?
- Cells aligned in twisted state
- High refresh rate 120 or 144 Hz (Popular with gamers)
-Earliest Type
- Found in budget laptops, smart phones, & Tablets
Benefits
-Faster response times
- Less motion blur or ghosting when using it for something with high frame rate
Cons

Question 9

VA

Answer 9

Vertical Alignment

What to look out for?
- Tilt
- Good middle ground between TN and IPS
Benefits
- Wide color palette
Really good contrast ratio (Dark darks and light lites)

Cons
- Viewing angle not as good as IPS display
-Response times are slower than IPS and TN (will get Motion blur/ ghosting)

Question 10

LED

Answer 10

Light-Emitting Diode

What to look out for?
- Newer form of light that uses Direct Current (DC)
- When using LED you’re still going to use TN, IPS, or VA
Benefits
- Uses less power leading to longer battery life
Cons

Question 11

CCFL

3

Answer 11

Cold Cathode Fluorescent Lighting

What to look out for?
- Lamp behind display
- AC voltage (uses inverter to convert DC to AC)
- If burns out/stops you cant see things on the display

Question 12

Inverter

4

Answer 12

Also known as Inverter board, Screen Inverter, and LCD Inverter

What to look out for?
- Small green board attached to LCD panel
- In mobile devices, it is the power supply for the backlight of LCDs (LCDs rely on backlight)
- IF broken/ bad the display will be dim and hard to see without external light.
Benefits
- Uses less power leading to longer battery life
Cons

Question 13

Digitizer

3

Answer 13

What to look out for?
- Converts touch into digital signals interpreted as input
- layer sandwiched between protective glass and the display panel inside of a touchscreen display
- Haptic feedback (Touch responsiveness(feeling of typing on keyboard)

Question 14

Accelerometer

5

Answer 14

What you look out for
- focuses on gravity, vibration, quick acceleration.
- System and signal to stop operation when it senses droping or sudden force to prevent data loss
- Driving games
- Does good with X (Roll) and Y axis (pitch)

Cons
- doesn’t do well with Z axis (depth - forward and backward)

Question 15

Gyroscope

5

Answer 15

Would you look out for?
- Gestures (ex: shake to undo)
- Image stabilization
- Can move in three dimensions. Detects pitch (y), roll (X), and yaw (z)
- Flight simulator simulator
- Live photos

Question 16

IMAP

5

Answer 16

Internet, message, access, protocol

What to look out for
- TCP/IP application
- uses TCP port 143
- Encrypted port: 993
- leaves email on the server and allow for synchronization to all devices
- includes read status

Question 17

POP3

5

Answer 17

Post office protocol

What to look out for
- ports 110
- Encrypted port 995
- Mail is downloaded to device and removed from mail servers mailbox
- server deletes messages once downloaded
- TCP/IP application protocol provides access to mail stored in remote mailbox server

Question 18

SMTP

3

Answer 18

Simple, mail, transfer, protocol

What to look out for
- used to send email not receive
- port 25
- Encrypted port 465

Question 19

HTTPS

2

Answer 19

Hyper, text, transfer, protocol, secured

What to look out for
- Used for secure, web browsing
- port 443

Question 20

LCD

Answer 20

Liquid crystal display

What to look out for
- controlled by electrical current to crystals inside display

Question 21

Signature pad

2

Answer 21

What do you look out for?
- electronically captures handwritten signature, using pen or stylus
- Once captured digital signatures can be digital stored for future use

Question 22

NFC

Answer 22

Near, field, communication

What to look out for
- Set of protocols that enable two electronic devices
- contactless payment
- transfer contact or information

Question 23

Bluetooth

3

Answer 23

What to look out for
- Wireless technology standard used for transferring data between devices over short distances
- essentially a personal area network
- commonly used with a mouse, trackpad, keyboard, headphones, etc

Question 24

Touchpad

1

Answer 24

What to look out for
- output device designed to control cursor instead of the mouse

Question 25

iCloud

1

Answer 25

What to look out for
- Apple cloud file synchronization

Question 26

M.2

6

Answer 26

“M dot 2”

What’s the lookout for?
- New set of form factors for mini card interfaces
- provides direct interface with PCIe bus to provide higher bus speeds then SATA connection
- comes in four different sizes based on length (depends on the model and space available)
- 80 mm: most common used in modern laptops
- 1.8 inch or 2.5 inch: modern laptops
- 3.5 inch: only used in desktops

Question 27

UDP

Netflix
8

Answer 27

User datagram protocol

what to look out for
- connectionless
- No acknowledgement
- Sequecing
- Not reliable
- Data sent over UDP can be lost/never sent
- not used for general web browsing over HTTP/ HTTPS
- UDP is very good at streaming media like videos (faster than TCP)
- Streaming videos or making Voice over IP (VoIP) calls are examples of use cases that rely upon UDP for their transmission.