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Comptia N+ From Classroom > Unbounded Network Media > Flashcards

Unbounded Network Media Flashcards

1
Q

Definition of wireless communication

A

Wireless communication: A type of communication where signals are transmitted over a distance without the use of a physical medium. Also referred to as unbounded network media.

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2
Q

Definition of Latency

A

Latency: The time delay for a packet to go from a source to a destination and back to the source.

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3
Q

Definition of MIMO

A

MIMO: (multiple input, multiple outputs) A wireless communication method that uses multiplexing via multiple antennas and antenna pathways to increase wireless network range and bandwidth.

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4
Q

Definition of MUMIMO

A

MUMIMO: (multi-user MIMO) A wireless communication method that allows multiple independent radio antennas to access the same channel on a system.

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5
Q

Give a description of Bluetooth

A

Short-range wireless communication (WPAN)
Connect up to 8 devices within 30 meters of each other
Uses RF, not line of sight
Back-end transport for some NFC communications

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6
Q

Give a description of JID

A

Radio-Frequency Identification
Communicate between tag and reader
Tags have an antenna for transmission and a circuit for processing or storage
Passive and active tags
A reader sends encoded radio signals to tag looking for a response

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7
Q

Give a description of IR

A

Infrared
Signals sent as light pulses (300 to 300,000 GHz) just below visible light
Line of sight is needed, but signals can bounce off hard surfaces

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8
Q

Give a description of NFC

A

Near Field Communication
Radio communication between devices that are touching or in close proximity
Runs at 13.5 MHz
Slower than Bluetooth

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9
Q

Definition of IEEE 802.11 Standard

A

A family of specifications was developed by the Institute of Electrical and Electronics Engineers (IEEE) for wireless LAN technology.

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10
Q

Description of IEEE 802.11 Standard

A

The over-the-air interface between client and base station or two clients
CSMA/CA access method
Spread spectrum radio in the 2.4 GHz band

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11
Q

What is the transmission speed(Mbps), frequency(Gbps), maximum theoretical geographical range (m), and Maximum No. of Supported MIMO Streams of the standard 802.11a

A

Transmission Speed (Mbps):54

Frequency (GHz): 5

Maximum Theoretical Geographic Range (m): 20

Maximum No. of Supported MIMO Streams: 1

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12
Q

What is the transmission speed(Mbps), frequency(Gbps), maximum theoretical geographical range (m), and Maximum No. of Supported MIMO Streams of the standard 802.11ac

A

Transmission Speed (Mbps): 443 per channel

Frequency (GHz): 5

Maximum Theoretical Geographic Range (m): 35

Maximum No. of Supported MIMO Streams: 8

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13
Q

What is the transmission speed(Mbps), frequency(Gbps), maximum theoretical geographical range (m), and Maximum No. of Supported MIMO Streams of the standard 802.11b

A

Transmission Speed (Mbps):11

Frequency (GHz): 2.4

Maximum Theoretical Geographic Range (m): 100

Maximum No. of Supported MIMO Streams: 1

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14
Q

What is the transmission speed(Mbps), frequency(Gbps), maximum theoretical geographical range (m), and Maximum No. of Supported MIMO Streams of the standard 802.11g

A

Transmission Speed (Mbps):54

Frequency (GHz): 2.4

Maximum Theoretical Geographic Range (m): 100

Maximum No. of Supported MIMO Streams: 1

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15
Q

What is the transmission speed(Mbps), frequency(Gbps), maximum theoretical geographical range (m), and Maximum No. of Supported MIMO Streams of the standard 802.11n

A

Transmission Speed (Mbps): 150

Frequency (GHz): 204 or 5

Maximum Theoretical Geographic Range (m):70

Maximum No. of Supported MIMO Streams: 5

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16
Q

Give a full description of wireless bands and channels

A

The 2.4 GHz band holds 14 channels in the ISM portion of the spectrum (72 MHz wide).
Channels 1 through 11 in the US
Channels 1 through 13 in Europe
Channels 1 through 14 in Japan (channel 14 limited to 802.11b)
Transmitted data spread across all frequencies in the channel.
Channel overlap can cause interference
Three non-overlapping channels are possible on the 2.4 GHz band
1, 6, and 11
Can experience congestion on those channels
Newer APs negotiate the channel to use.

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17
Q

Definition of channel bonding

A

The practice of combining wireless channels for increased data capacity.

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18
Q

Give a full description of channel bonding

A

Neighboring channels combined into a larger channel
Doubling channel width increases data capacity by slightly more than double
In 802.11n, use bonding to combine two 20 MHz channels into a 40 MHz channel.
In 802.11ac, use bonding to create 40 MHz, 80 MHz, and 160 MHz channels.
5 GHz band has a larger frequency range
Up to 25 non-overlapping channels
Possibly harder to implement channel bonding

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19
Q

Give a full description of wireless speed and distance

A

Distance between devices
Interference with other networks
Presence of corners, walls, and solid objects through which the signal passes
For 2.4 GHz, interference with microwave ovens
Number of devices sharing the signal

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20
Q

What is the unobstructed Distance (m), max theoretical throughput (Mbps), and typical Throughput (Mbps) for the standard 802.11a

A

Unobstructed Distance (m): 120

Max theoretical throughput (Mbps): 54.4

Typical Throughput (Mbps) : 25

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21
Q

What is the unobstructed Distance (m), max theoretical throughput (Mbps), and typical Throughput (Mbps) for the standard 802.11b

A

Unobstructed Distance (m):140

Max theoretical throughput (Mbps):11

Typical Throughput (Mbps) : 2 to 6

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22
Q

What is the unobstructed Distance (m), max theoretical throughput (Mbps), and typical Throughput (Mbps) for the standard 802.11g

A

Unobstructed Distance (m):140

Max theoretical throughput (Mbps):54

Typical Throughput (Mbps) :20

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23
Q

What is the unobstructed Distance (m), max theoretical throughput (Mbps), and typical Throughput (Mbps) for the standard 802.11n

A

Unobstructed Distance (m):250

Max theoretical throughput (Mbps):150 per stream
(4 streams: 600)

Typical Throughput (Mbps) :40 to 80

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24
Q

What is the unobstructed Distance (m), max theoretical throughput (Mbps), and typical Throughput (Mbps) for the standard 802.11ac

A

Unobstructed Distance (m):250

Max theoretical throughput (Mbps):866.7 per stream
(8 streams: 6,934)

Typical Throughput (Mbps) : At least 70 to 100
In some cases over 200
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25
Q

Definition of WAPs

A

A device that provides a connection between wireless devices and can connect to wired networks.

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26
Q

Definition of SSID

A

(Service Set Identifier) A 32-bit alphanumeric string that identifies a WAP and all devices attached to it.

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27
Q

Give a full description of SSID

A

WAPs and wireless routers come with a default SSID.
Security features for specifying which wireless devices can connect to the wired network.
Client devices use the SSID to identify themselves to the wireless network.

28
Q

What happens when there is an SSID mismatch

A

When a device receives a packet that contains a different SSID than its own
Devices need to be configured with the same SSID as the WAP
Mismatch of SSIDs can block communication
Configuration is usually automated, so few mismatches occur

29
Q

Give a full description of wireless controllers

A

Provide wireless LAN management for multiple APs
Used in combination with the LWAPP
A protocol that controls multiple Wi-Fi wireless access points
Automatic configuration of WAPs
Can be a physical device or a software application

30
Q

Definition of wireless antennas

A

A device that converts high-frequency signals on a cable into electromagnetic waves and vice versa.

31
Q

Give a full description of wireless antennas

A 
Frequency depends on the physical dimensions of the antenna
High frequency denotes short wavelength and short antenna
Gain (signal strength)
Amplitude increase
High gain and power limitations
Bleed
Signal extends beyond boundaries
Control by restricting signal output
Polarization
Linear/Vertical/Horizontal
Circular
Directionality
Directional/Unidirectional
Omni-directional
32
Q

Give a description of wireless range extenders

A 
Picks up signals from a Wi-Fi router
Amplifies the signal and rebroadcasts it
Allows you to pick up wireless signals beyond the range of the current Wi-Fi signals
Good for:
Multi-floor locations
Locations with thick walls
Other dead zones within a building
33
Q

Give all the wireless performance factors

A 
Infrared:
Sunlight
Obstacles
Smoke, dust, fog
Radio:
Antenna signal characteristics
Wire mesh in walls, thick walls
Ambient electrical noise
Conductive obstacles
Other electrical equipment
Data transmission rate
Radio frequency
34
Q

Give a description of STA

A

Station (STA)

A device that can use the IEEE 802.11 protocol.
A wireless STA contains an adapter card, a PC card, or an embedded device to provide wireless connectivity.

35
Q

Give a descrption of AP

A

AP(Acess Point)

A device or software that facilitates communication and provides enhanced security to wireless devices.
Extends the physical range of a WLAN.
Functions as a bridge between wireless STAs and the existing network backbone for network access.

36
Q

Give a descrption of Service Sets

A

Defines the way a WLAN is configured.

Three ways to configure a WLAN—BSS, IBSS, and ESS.

37
Q

Give a descrption of BSS and BSSID

A

Basic Service Set and Basic Service Set Identifier
A set of devices with an AP connected to a wired network and one or more wireless stations or clients.
A BSS can effectively extend the distance between wireless endpoints by forwarding signals through the WAP.
The BSSID is a unique address that identifies the BSS.

38
Q

Give a descrption ESS and ESSID

A

Extended Service Set and Extended Service Set Identifier
Multiple BSSs used to handle mobility on a wireless network.
Connected to a common distribution system such as a wired network.
ESS enables users to move mobile devices out of their home BSS while keeping their connection.
Enables data to be forwarded from one BSS to another through the network backbone.
ESSID identifies the extended service set. Also known as service set identifier (SSID).

39
Q

Give a descrpiton of IBSS

A

Independent Basic Service Set
A peer-to-peer network where each wireless STA acts as both a client and a wireless AP.
Each wireless STA can transmit and receive data.

40
Q

Give a descrption of DS

A

Distribution System
A wired connection between a BSS and a premise-wide network.
Enables mobility for devices and access to network resources.

41
Q

Give a description of the factor of wireless range extenders, which is speed.

A

Signal from a range extended is usually about half the speed of the original Wi-Fi signal.
Since distance or other factors required the use of the extender, the signal will be stronger than what you were getting.

42
Q

Give a description of the factor of wireless range extenders, which is match router indentification.

A

For dual band routers, make sure the extender is also dual band.
If your Wi-Fi router uses MU-MIMO, make sure the extender uses it too.

43
Q

Give the differnces of the factors of wireless range extenders, which is desktop vs plug in.

A

Desktop models contain movable external antennas and several LAN ports.
Plug-in models connect directly to wall outlets and contain one LAN port.

44
Q

Give a description of the factor of wireless range extenders, which is SSID.

A

Extenders have their own SSIDs.

Devices can lose wireless signal as they move between different SSID networks.

45
Q

Give a description of the factor of wireless range extenders, which is bandwith.

A

Devices connected to dual band wireless range extenders compete with the router for bandwidth.

46
Q

Defintion of SSID broadcasts

A

A continuous announcement by a WAP that transmits its name so that wireless devices can discover it.

47
Q

Give a full descrption of SSID broadcasts

A

Often referred to as a beacon.

If a WAP is password-protected, devices can see it but not connect to it.

48
Q

Give all the guidelines for implementing a basic wireless network

A 
Create a list of network requirements.
Consider the devices you need and any requirements they have.
Consider environmental limitations.
Consider equipment limitations.
Consider compatibility requirements.
Choose appropriate 802.11 technology.
Choose appropriate AP placement locations.
Install APs.
Test after installation:
Appropriately sized
Secure
Operational
Use periodic site surveys to monitor performance levels.
Document steps and establish a baseline.
49
Q

Give a descritption of WAP Placements

A 
Building layout
Identification of coverage areas
Candidates for WAP placement
Coverage area
Cell is the area covered by an AP
Large cells might need more APs
Guarantee continuous access with overlapping cells
Clients
How many clients determines how many APs
Obstacles
Absorb or reflect signals?
Interference
RFI from other devices
50
Q

Give all the uses of bluetooth

A

Facilitates short-range wireless communication between devices
Connect 2 to 8 devices

51
Q

Give all the uses of RFID

A 
Tags and readers used for:
Inventory management and tracking
ID badges for room or building access
Asset management and tracking
Real-time location service
52
Q

Give all the uses of IR

A

Provide network connectivity in wireless personal area networks
Short-term connections between two PCs or between a PC and a wireless handheld device
Extends networks where installing cable may be difficult

53
Q

Give all the uses of NFC

A

Make payments using a smartphone

Apps such as Android Wallet, Microsoft Wallet, and Apple Pay

54
Q

Give defintion of IoT

A

(Internet of Things) A collection of physical objects that contain embedded components for the collection and transmission of data over a network.

55
Q

Give a descripition of IoT

A

More and more non-computer devices attached to global network.
Used in homes:
Makes using appliances, utilities, and devices easier and more efficient.
Used in manufacturing:
Increases efficiency and reduce costs through automation of tasks and monitoring devices, ambient temperature and humidity, and more.
Used in vehicles:
Assists with parking, “seeing” in blind spots, and monitoring vehicle functions.
If any functions are not within established limits, a message is sent to the user or directly to the service facility.

56
Q

Give a description of Z wave and give examples

A

Designed for controlling and monitoring home or light commercial devices.
Based on RF, communicates over short range and uses less power than other Wi-Fi solutions.
Operates under 1 GHz, no interference with other wireless traffic

Examples:
Smart thermostats
Lighting
Locks
Sensors
Hubs
57
Q

Give a description of ANT+ and give examples

A

A wireless sensor network technology operating in the 2.4 GHz band.
Connects devices to a hub with the channels synchronizing themselves as needed.
Data rate is 1 Mbps at 1 mW power.

Examples:

Health and fitness monitors
BMI sensors in weight scales
Temperature sensors

58
Q

Give a description of Bluetooth and give examples

A

Bluetooth Low Energy (LE), also called Bluetooth Smart or Version 4.0+.
A low-power, standardized application development architecture.
Provides tight security, native support on every major OS, and connectivity to the cloud.
It was built for the IoT.

Examples:
Smart phones
Music players
Tracking devices
Locks
Lights
59
Q

Give a description of NFC and give examples

A

NFC technology allows users to tap an NFC-enabled device or a device with an NFC tag affixed to it and connect to the NFC gateway.

Examples:
Share data
Initiate an action
Open a URL
Open locks
Read utility meters
Control appliances
Connect devices to Bluetooth or WiFi networks
60
Q

Give a description of IR and give examples

A

Connect to an IR blaster gateway or bridge to connect to a WiFi or Ethernet cabled network.
Signals can then be controlled by an app on your smart phone, tablet, or computer.

Examples:
Detect and measure heat, chemical gases, medical analysis through breathalyzers
Remote control of appliances

61
Q

Give a description of 802.11

A

802.11 ah, also known as WiFi HaLow, is designed specifically for the IoT.
Still in development; but will take advantage of IoT technologies already in use.
Uses the 900 MHz frequency band and can communicate at 10 to 20 Mbps

Examples:
Same types of devices as other IoT technologies
Parking sensors
Other large-scale city-wide implementations

62
Q

Give a description of RFID

A

Many smart objects contain sensors and an RFID tag.
Allows for communication of information to the app that monitors and controls the smart object.

Examples:
ID/entry access cards
Tracking tags

63
Q

Give a full description of IoT devices

A

Device is connected to the network
Can be monitored and controlled remotely
Includes devices designed to be remotely controlled
Includes devices to which components such as RFID tags or other communications modules were added
Device is connected to the network
Can be monitored and controlled remotely
Includes devices designed to be remotely controlled
Includes devices to which components such as RFID tags or other communications modules were added
Examples include:
Amazon Echo
Google Home
FitBits
Devices fitted with sensors such as thermostats, appliaDevice is connected to the network
Can be monitored and controlled remotely
Includes devices designed to be remotely controlled
Includes devices to which components such as RFID tags or other communications modules were added

64
Q

Give examples of IoT devices

A 
Examples include:
Amazon Echo
Google Home
FitBits
Devices fitted with sensors such as thermostats, appliances, light bulbs, and devices plugged into IoT modules.
65
Q

Give a description of Smart House Devices

A

Not only a convenience
Can help lower cost of operation and reduce energy use
Can remotely monitor and operate devices
With a smart thermostat, lower the temperature while away and raise it on your way home
Lock or unlock a door using a smart phone app
Close blinds based on light or temperature sensor readings
Remotely turn lights on or off, or dim the lights

66
Q

Give a description of Sensor Devices

A

Gather raw data, which is sent to a gateway device or directly to a wireless sensor network
Actuators might be activated based on the sensor data
Smart devices come with sensors built in, or you can retrofit existing devices with tags to turn them into smart devices

67
Q

Give all the condtions sensors can detect

A

Some of the conditions sensors can detect include:
Motion
Velocity (including acceleration/deceleration)
Axis tilt
Air (or other gasses) pressure, quality, content
Temperature (ambient, contact, non-contact)
Vibration
Humidity
Electromagnetic noise
Radio Interference
Acoustic data
Pressure
Heart rate

Comptia N+ From Classroom (6 decks)

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