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A+ 1101 > Mobile Devices > Flashcards

Mobile Devices Flashcards

1
Q

SO-DIMM

A

Small Outline Dual In-Line Memory Module

Used to add memory to a laptop

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2
Q

Magnetic Disk

A

Laptop Storage

Traditional spinning drive platters

2.5 form factors
3.5 for desktops

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3
Q

SSD

A

Solid State Drive

Laptop Storage
All memory, no moving parts
Silent, fast access time, less latency
2.5 in form factors

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4
Q

M.2

A

Laptop Storage

Smaller form factor

No SATA data or power cables

Easy to install and replace

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5
Q

HDD

A

Hard Disk Drive

Memory

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6
Q

Migrating from HDD to SSD
Install an OS on the SSD

A

Move user documents between drives

Install any required applications

Can be time consuming

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7
Q

Different ways to migrate from HDD to SSD

A
  1. Install an OS on the SSD
    Move user documents
    between drives
    Install any required
    applications
  2. Image/Clone the HDD
    No OS installation
    required
    Move everything from
    one to the other
    Imaging software is
    needed
  3. Create and image file
    One drive at a time
  4. Drive to drive image
    Image directly from one
    drive to the other
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8
Q

802.11

A

LAN, high speed, internet access

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9
Q

LAN

A

Local Area Network

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10
Q

Bluetooth

A

PAN
Short Range
Connect peripherals and other nearby devices

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11
Q

PAN

A

Personal Area Network

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12
Q

Biometrics

A

Sign-in/unlock option on your devices
Fingerprint or face

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13
Q

NFC

A

Near-Field Communication

Short-Distance networking (~4cm)
Data transfers or authentication

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14
Q

LCD

A

Liquid Crystal Display

Light shines through liquid crystals

Advantages:
Lightweight
Relatively low power and inexpensive

Disadvantages:
Black levels are a challenge
Requires separate backlight (Fluorescent, LED, etc) and are difficult to replace

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15
Q

TN LCD

A

Twisted Nematic

Original LCD tech
Fast response times (gaming)
Poor viewing angles (color shifts)

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16
Q

IPS LCD

A

In Plane Switching

Excellent color representation
More expensive to produce than TN

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17
Q

VA LCD

A

Vertical Alignment
A good compromise between TN and IPS
Good color representation
Slower response times than TN

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18
Q

OLED

A

Organic Light Emitting Diode

Organic Compound emits light when receiving an electric current

Thinner and lighter (no glass needed)
No backlight

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19
Q

OLED Examples

A

Tablets, phones, smart watches

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20
Q

Wifi antennas in Laptops

A

Multiple
1. Wifi main and aux (wire wraps about the laptop screen)
2. Bluetooth

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21
Q

Webcam in Laptops

A

Built in camera and microphone
- Specialized drivers and software

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22
Q

Microphone in Laptop

A

Built-in
-Useful for video calls
-Not good for non-casual use
-Analog or USB microphones can help

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23
Q

Fluorescent Backlighting in Laptops (CCFL)

A

-Cold Cathode Fluorescent Lamp
-Higher voltage and power needed that LED backlighting
-Added thickness to the display
-Found more often in older laptops

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24
Q

LED-backlit LCD display

A

-LEDs are located around the edge of the screen
-An array of LEDs behind the screen
-Most new laptops are LED-backlit

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25
Q

LCD Inverter

A

-Some laptops have inverters
-Turn DC (computer power) into AC (fluorescent power)

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26
Q

Digitizer

A

-Use a pen-like device as input
-Stylus input
-Useful for graphical input

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27
Q

Touchscreen device

A

-Merge laptop and tablet input
-Digitizer responds to touch
-No keyboard required but often available

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28
Q

USB

A

-Universal Serial Bus
-High-speed wired communication
-Used for charging and data transfers
-Type A (normal)

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29
Q

Micro-USB

A

-A smaller USB connection
-Common now worldwide

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30
Q

Mini-USB

A

-Used by older devices
-Slightly larger

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31
Q

USB-C

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)

32
Q

Lightening Cable

A

-Apple proprietary
-8-pin digital signals

Advantages over Micro-USB:
-Higher power output for phones and tablets
-can be inserted either way
-simpler design

33
Q

Serial Interfaces

A

-“DB-9”
-Commonly used for RS-232 signals
—Recommended Standard 232
- Standard before USB
–traditionally used for modem connection
-Used now as a configuration port (switch, routers, firewalls, etc)

34
Q

NFC

A

-Near Field Communication
-Send small amounts of data wirelessly over a limited area
-Short range w/ encryption support

35
Q

Hotspot

A

-Turn your phone into a wifi hotspot
-Your own personal wireless router
-Extend the cellular data network to all of your devices

36
Q

Touch pens

A

-Touchscreen Pen/Stylus
-Activate the interface without actually touching it

37
Q

Active Stylus

A

-Digital Stylus
-The stylus communicates directly to the device
-Must be compatible with the tablet (Apple Pencil to Apple iPad)

38
Q

Drawing Pad

A

-Use an active stylus with an external digitizer (very precise input)
-Third-party device (support across many operating systems

39
Q

Trackpad

A

-Replaces the mouse
-Can enable or disable
-External options available

40
Q

Headsets

A

-Wired
-USB connections are common on laptops
-Connects to 3.5mm TRRS (tip-ring-ring-sleeve) connector
-Analog audio jack
-iPhones can use lightening port

41
Q

Docking Station

A

-Use external keyboard and mouse
-Extend existing laptop interfaces
-Add additional functionality
-Desktop adapter cards

42
Q

Port replicator

A

-Similar to a docking station
-Does not commonly have an expansion card option
-Usually connects using USB

43
Q

GSM

A

Global System for Mobile Communication
-Mobile networking standard
-90% of the market
-Used by at&t and t-mobile
-(move your SIM card from phone to phone)
-Slice of time

44
Q

SIM card

A

Subscriber Identity Module card for phones

45
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 said
-Used by Verizon and Sprint
-Handsets are controlled by the network provider

46
Q

3G tech

A

-3rd generation
-Upgraded data connectivity over 2G
-Bandwidth improvement allowed new functionality (GPS, mobile television, video on demand)

47
Q

4G and LTE

A

-‘Long Term Evolution’
-Converged standard (GSM and CDMA)
-Standard supports download rates of 150Mbit/sec

48
Q

4G LTE-A

A

-LTE - Advanced
-Standard supports download rates of 300Mbit/s

49
Q

5G

A

-Significant performance improvements
–At higher frequencies
-Eventually 10gigiabits/sec
-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

50
Q

PRL Updates

A

-Preferred Roaming List
-CDMA networks (ie Verizon and Sprint)
-Allows your phone to connect to the right tower
-Can be updated Over The Air (OTA)

51
Q

GPS

A

-Global Positioning System
-Created by DoD
-Over 30 satellites in orbit
-Need to see at least 4 satellites to measure timing differences

52
Q

MDM

A

-Mobile Device Management
-Manage company-owned and user-owned mobile devices
-Set policies on apps, data, camera, etc
-Manage access control
–Force screen locks and PINs on these single user devices

53
Q

MDM Configuration

A

-Corporate email configuration
-Two factor authentication (biometrics, pseudo-random authentication app)
-Allow or restrict app installation
-prevent unauthorized app usage

54
Q

TCP

A

TCP

55
Q

UDP

A

-User Datagram Protocol
-Connectionless (no formal open or close to the connection)
-“Unreliable” delivery
–No error recovery
–No reordering of data or retransmissions
-No flow control
–Sender determines the amount of data transmitted

56
Q

Why would you ever use UDP?

A

-Real-time communication
-There’s no way to stop and resend the data
-Time doesn’t stop for your network
-DHCP (Dynamic Host Configuration Protocol)
-TFTP (Trivial File Transfer Protocol)

57
Q

Communications that use TCP and why

A

-Connection-oriented protocols prefer a ‘return receipt’
-HTTPS (Hypertext Transfer Protocol Secure)
-SSH (Secure Shell)
-The application doesn’t worry about out-of-order frames or missing data
-TCP handles all of the communication overhead

58
Q

Non-ephemeral ports

A

-Permanent port numbers
-Ports 0-1023
-Usually on a server or service

59
Q

Ephemeral ports

A

-Temporary port numbers
-Ports 1024 through 65,535
-Determined in real time by the client

60
Q

Port Numbers

A

-TCP and UDP ports can be any number between 0-65,535
-Most servers use non-ephemeral port number
-Port numbers are for communication not security
-Service port numbers need to be well-known
-Important for firewall rules (port-based security)

61
Q

FTP

A

-File Transfer Protocol
-tcp/20 = active mode data
-tcp/21 = control
-Transfers files between systems
-Authenticates with a username and password
-Some systems use a generic/anonymous login

62
Q

SSH

A

-Secure Shell
-Encrypted communication link
-tcp/22
-Looks and acts the same as Telnet

63
Q

Telnet

A

-Telecommunication Network
-tcp/23
-Login to devices remotely (console access)

64
Q

SMTP

A

-Simple Mail Transfer Protocol
-Server to server email transfer
-tcp/25
-Also used to send mail from a device to a mail server
Other protocols are used for clients to receive emails (IMAP, POP3)

65
Q

DNS

A

-Domain Name System
-Converts names to IP addresses
-upd/53

66
Q

DHCP

A

-Dynamic Host Configuration Protocol
-Automated configuration of IP address, subment mask, and other options
-udp/167, udp/168
-Requires a DHCP server

67
Q

DHCP Dynamic/Pooled

A

-IP addresses are assigned in real-time from a pool
-Each system is given a lease and must renew at a set interval

68
Q

DHCP Reservation

A

-Addresses are assigned by MAC address in the DHCP server
-Manage addresses from one location

69
Q

HTTP

A

-Hypertext Transfer Protocol
-Communication in the browser and by other applications
-tcp/80

70
Q

HTTPS

A

-Hypertext Transfer Protocol Secure
-Secure communication in the browser
-Encrypted
-tcp/443

71
Q

POP3

A

-Post Office Protocol version 3
-Receive emails from an email server
-Authenticate and transfer
-tcp/110
-Basic mail transfer functionality

72
Q

IMAP

A

-Internet Message Access Protocol v4
-tcp/143
-Receive emails from an email server
-includes management of email inbox from multiple clients

73
Q

SMB

A

-Server Message Block
-Protocol used by Microsoft Windows
-File sharing, printer sharing
-“CIFS” - Common Internet File System
-using NetBIOS over TCP/IP (Network Basic Input/Output System)
–udp/137 = NetBIOS name services (nbname)
–tcp/139 = NetBIOS session service (nbsession)
-Direct over tcp/445 (NetBIOS-less) (Direct SMB connection over TCP w/o the NetBIOS transport

74
Q

SNMP

A

-Simple Network Management Protocol
-Gather statistics from network devices
-udp/161 = queries
-udp/162 = traps

75
Q

LDAP

A

-Lightweight Directory Access Protocol
-tcp/389
-Store and retrieve information in a network directory
-Commonly used in Microsoft Active Directory

76
Q

RDP

A

-Remote Desktop Access Protocol
-Share a desktop from a remote location
-tcp/3389
-Can connect to an entire desktop or just an application
-Clients for Windows, macOS, Linux, UNIX, iPhone, Android, and others

A+ 1101 (6 decks)

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