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My CompTIA A+ > Mobile Devices > Flashcards

Mobile Devices Flashcards

1
Q

Laptop batteries - what type

A
  • The power source when unplugged
    – May be easily replaced or require a tear down
    – Five minutes vs. one hour
  • Lithium-Ion (Li-ion) and
    – Lithium-Ion polymer (LiPo) are common
    – No “memory effect”
    – Charging the battery diminishes capacity
  • Different form factor for each laptop
    – Battery types and styles can vary
    – Battery technology is changing constantly
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2
Q

Laptop memory What kind?

A

Small Outline Dual In-line Memory Module (SO-DIMM)
* Memory used in laptops and mobile devices
– Often easy to install and replace
* Some laptop memory is soldered to the system board
– No upgrade available
– Requires a full system board replacement

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3
Q

What kind Laptop storage?

A
  • Magnetic disk
    – Traditional spinning drive platters
    – 2.5 form factors (3.5 inch for desktops)
  • SSD (Solid-state drive)
    – All memory, no moving parts
    – Silent, fast access time, less latency
    – 2.5 inch form factors
  • M.2
    – Smaller form factor
    – No SATA data or power cables
    – Easy to install and replace
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4
Q

Migrating from HDD to SSD

A
  • Install an OS on the SSD
    – Move user documents between drives
    – Install any required applications
    – Can be time consuming
  • Image/clone the HDD
    – No OS installation required
    – Move everything from one to the other
  • Imaging software needed
    – Sometimes included with the SSD
    – Many commercial and open source options
  • Create an image file - One drive at a time
  • Drive-to-drive image
    – Image directly from one drive to the other
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5
Q

802.11 wireless and Bluetooth

A
  • Wireless network connectivity
    – Connect without wires
  • 802.11
    – Local area network (LAN)
    – High speed, Internet access
  • Bluetooth
    – Personal area network (PAN) - Short range
    – Connect peripherals and other nearby device
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6
Q

Biometrics Types

A

Sign in or unlock your laptop with a
fingerprint reader or face recognition
– Something you are
* Requires additional configuration in the OS
– Hardware required for most options
* Relatively secure
– Faces and fingerprints are quite unique

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7
Q

What is Near-field communication (NFC)

A

Short-distance networking
– 4 centimeters or less
– Data transfers or authentication
* Common on mobile phones and smart watches
– Payment method on your wrist
* Use it for authentication without typing a password
– Hospital workstations, warehouses, manufacturing

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8
Q

Pros Cons Portable LCD

A

Portable LCD
* Liquid crystal display
– Light shines through liquid crystals
* Advantages
– Lightweight
– Relatively low power
– Relatively inexpensive
* Disadvantages
– Black levels are a challenge
– Requires separate backlight
– Florescent, LED, etc.
– Lights are difficult to replace

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9
Q

3 types LCD technologies

A

TN (Twisted Nematic) LCD
– The original LCD technology
– Fast response times (gaming!)
– Poor viewing angles - color shifts
* IPS (In Plane Switching) LCD
– Excellent color representation
– More expensive to produce than TN
* VA (Vertical Alignment) LCD
– A good compromise between TN and IPS
– Good color representation
– Slower response times than TN

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10
Q

Explain OLED

A
  • Organic Light Emitting Diode
    – Organic compound emits light when
    receiving an electric current
  • Thinner and lighter
    – Flexible and mobile - no glass needed
  • No backlight
    – The organic compound provides the light
  • Tablets, phones, smart watches
    – Very accurate color representation
    – A bit higher cost than LCD
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11
Q

Wi-Fi antennas locations

A
  • Multiple antennas
    – WiFi main and aux / Bluetooth
  • Antenna wires wrap around the laptop screen
    – It’s up high!
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12
Q

describe Webcam

A
  • Video capture - Built-in camera and microphone
  • Usually includes both audio and video
    – Specialized drivers and software
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13
Q

describe Microphone

A
  • Built-in to the laptop display
    – Useful for video calls
  • Not good for non-casual use
    – Analog or USB microphones can help
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14
Q

Fluorescent vs. LED backlighting

A
  • LED-backlit LCD display
    – Backlight is LEDs instead of florescent
    – LEDs around the edge of the screen
    – An array of LEDs behind the screen
    – The latest laptops are LED-backlit
  • CCFL - Cold Cathode
    – Fluorescent Lamp
    – Higher voltage and power needed
    – Added thickness to the display
    – No longer a common backlight
    – Older laptops will use these
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15
Q

Explain Backlight and inverter

A
  • LCD displays need a backlight
    – Florescent lamp/LED to LCD display to your eyes
  • Some laptops have inverters - Turn DC into AC
  • Verify backlight
    – Look closely and use a flashlight
  • May need to replace the LCD inverter or display
    – Choose carefully
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16
Q

Explain Digitizer

A
  • Use a pen-like device as input
    – Stylus input - Useful for graphical input
  • Used commonly on laptop / tablets
    – Or hybrid device
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17
Q

Explain Touchscreen

A

Merge laptop and tablet input
– Digitizer responds to touch - No keyboard required
* But often still available
– Many options for input - Use the best one for the job

18
Q

Explain USB

A
  • Universal Serial Bus
    – High-speed wired communication
    – Used for charging and data transfers
  • Micro-USB
    – A smaller USB connection
    – Common now worldwide
  • Older devices may use Mini-USB
    – Slightly larger
19
Q

Explain USB-C (pins..)

A

24-pin double-sided USB connector
– Used for both hosts and devices
* Acts as a USB 2.0/3.0/3.1/4 connection
– Different signals can use the same connector
* Can transmit other signals
– DisplayPort, HDMI, Thunderbolt

20
Q

Explain Lightning

A
  • Apple proprietary
    – 8-pin digital signals
    – iPhone and iPad devices
  • Some advantages over Micro-USB
    – Higher power output for phones and tablets
    – Can be inserted either way
    – Simpler design
21
Q

Explain Serial interfaces

A
  • DB-9 - also called DE-9
  • Commonly used for RS-232 signals
    – Recommended Standard 232
    – An industry standard since 1969
  • Serial communications standard
    – Traditionally used for modem connections
  • Now used as a configuration port
    – Switches, routers, firewalls, etc
    – Use a USB to DB-9 converter cable
22
Q

Explain NFC

A
  • Near Field Communication
    – Send small amounts of data wirelessly
    over a limited area
  • Built into your phone
    – Payment systems, transportation,in-person
    information exchange
  • Access token, identity “card”
    – Short range with encryption support
23
Q

Explain Bluetooth

A
  • High speed communication over short distances
    – PAN (Personal Area Network)
  • Connects our mobile devices
    – Smartphones
    – Tethering
    – Headsets and headphones
    – Health monitors
    – Automobile and phone integration
    – Smartwatches
    – External speakers
24
Q

Explain Hotspot

A
  • Turn your phone into a WiFi hotspot
    – Your own personal wireless router
    – Extend the cellular data network
    to all of your devices
  • Dependent on phone type and provider
    – May require additional charges and data costs
25
Q

Explain Touch pens

A

Touchscreen pen / touch screen stylus / capacitive stylus
– Activate the interface without actually touching it
* Handwriting
– Note taking, signatures
* Precise selection
– Easier to see the screen

26
Q

Explain Active stylus

A
  • Digital stylus
    – A more advanced writing tool
  • The stylus communicates directly to the device
    – Pressure sensitivity, programmable buttons, etc.
  • Must be compatible with the tablet
    – e.g., Apple iPad uses an Apple Pencil
27
Q

Explain Drawing pad

A
  • Use an active stylus with an external digitizer
    – Very precise input
28
Q

Explain Trackpad

A
  • Replace the mouse
    – Useful in tight working areas
    – Common on laptops
  • External options
    – Battery powered
    – Bluetooth connected
  • Drag and tap
    – Or use multiple finger input for right-clicking, zooming,
    and window control
  • Enable and disable
    – Avoid inadvertent mouse clicks and movements
29
Q

Explain Headsets

A
  • Hands-free audio - Earphones and microphone
  • Wired
    – USB connections are common on laptops
    – Connects to 3.5 mm
    TRRS (tip-ring-ring-sleeve) connector
    – Analog audio jack
    – iPhone can use Lightning port
  • Wireless - Bluetooth headsets
30
Q

Explain Docking station

A
  • Docking station
    – Use external keyboard and mouse
    – Extend existing laptop interfaces
    – Add additional functionality
    – Desktop adapter cards
    – Avoid cable issues
31
Q

Explain Docking Port replicator

A
  • Port replicator
    – Similar to a docking station
    – Does not commonly have an expansion card option
    – Usually connects using USB
32
Q

Explain Cellular networks

A
  • Mobile devices
    – “Cell” phones
  • Separate land into “cells”
    – Antenna coverages a cell with certain frequencies
  • 2G networks
    – GSM - Global System for Mobile Communications
    – CDMA - Code Division Multiple Access
  • Poor data support
    – Originally used circuit-switching
    – Minor upgrades for some packet-switching
33
Q

GSM

A
  • Global System for Mobile Communications
    – Mobile networking standard
  • 90% of the market
    – Originally an EU standard
    – Worldwide coverage
  • Used by AT&T and T-Mobile in the United States
    – Move your SIM card (Subscriber Identity Module) from
    phone to phone
  • Original GSM standard used multiplexing
    – Everyone gets a little slice of time
34
Q

CDMA

A
  • Code Division Multiple Access
    – Everyone communicates at the same time
    – Each call uses a different code
    – The codes are used to filter each call on the receiving side
  • Used by Verizon and Sprint
    – Handsets are controlled by the network provider
    – Not much adoption elsewhere
35
Q

Explain 3G technology

A
  • 3rd Generation
    – Introduced in 1998
  • Upgraded data connectivity over 2G
    – Incremental 3G updates improved speeds
    – Usually several megabits per second
  • Bandwidth improvement allowed new functionality
    – GPS
    – Mobile television
    – Video on demand
    – Video conferencing
36
Q

Explain 4G and LTE

A
  • Long Term Evolution (LTE)
    – A “4G” technology
    – Converged standard (GSM and CDMA providers)
    – Based on GSM and EDGE
    (Enhanced Data Rates for GSM Evolution)
    – Standard supports download rates of 150 Mbit/s
  • LTE Advanced (LTE-A)
    – Standard supports download rates of 300 Mbit/
37
Q

Explain 5G

A
  • Fifth generation cellular networking
    – Launched worldwide in 2020
  • Significant performance improvements
    – At higher frequencies
    – Eventually 10 gigabits per second
    – Slower speeds from 100-900 Mbit/s
  • Significant IoT impact
    – Bandwidth becomes less of a constraint
    – Larger data transfers
    – Faster monitoring and notification
    – Additional cloud processing
38
Q

Explain Hotspot

A

Turn your phone into a WiFi hotspot
– Your own personal wireless router
– Extend the cellular data network to all of your devices
* Dependent on phone type and provider
– May require additional charges and data costs

39
Q

Explain PRL

A
  • PRL (Preferred Roaming List) updates
    – CDMA networks (i.e., Verizon, Sprint)
  • Allows your phone to connect to the right tower
    – Can be updated over the air (OTA)
40
Q

Explain GPS

A

GPS (Global Positioning System)
* Created by the U.S. Department of Defense
– Over 30 satellites currently in orbit
* Precise navigation - Need to see at least 4 satellites
* Determines location based on timing differences
– Longitude, latitude, altitude
Mobile device location services and geotracking
– Maps, directions
– Determine physical location based on
GPS, WiFi, and cellular towers

41
Q

Explain MDM

A

MDM (Mobile Device Management)
* Manage company-owned and user-owned mobile devices
– BYOD - Bring Your Own Device
* Centralized management of the mobile devices
– Specialized functionality
* Set policies on apps, data, camera, etc.
– Control the remote device
– The entire device or a “partition”
* Manage access control
– Force screen locks and PINs on these single user devices

42
Q

Explain MDM configurations

A
  • Corporate email configuration
    – User does not need to configure anything
    – The MDM makes the changes on the device
    – Account details, server address, communication method
  • Two-factor authentication
    – Require specific authentication types
    – Biometrics, pseudo-random authentication app
  • Corporate applications
    – Allow or restrict app installation
    – Prevent unauthorized app usage

My CompTIA A+ (8 decks)

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