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IT Essentials Chapter 5 > WLAN Protocols > Flashcards

WLAN Protocols Flashcards

1
Q

What are 802.11 standards?

A

Wi-Fi standards.

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2
Q

Who are 802.11 standards issued by?

A

Institue of Electrical and Electronic Engineers.

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3
Q

What do 802.11 standards specify?

A

Speed.
Ranges.
Frequencies.

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4
Q

What 802.11 standards should be considered legacy?

A
  1. 11a
  2. 11b
  3. 11g
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5
Q

What WLAN standard should devices meet in the current day?

A

802.11ac

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6
Q

What is the maximum speed, indoor range and set frequency of 802.11a? Is it backwards compatible, if so with what?

A

54Mbps.
115 ft
5 GHz
It is not backwards compatible.

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7
Q

What is the maximum speed, indoor range and set frequency of 802.11b? Is it backwards compatible, if so with what?

A

11 Mbps
115 ft
2.4 GHZ
It is not backwards compatible.

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8
Q

What is the maximum speed, indoor range and set frequency of 802.11g? Is it backwards compatible, if so with what?

A

54 Mbps.
125 ft
2.4 GHz
It is backwards compatible with 802.11b.

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9
Q

What is the maximum speed, indoor range and set frequency of 802.11n? Is it backwards compatible, if so with what?

A

600 Mbps
230 ft
2.4 and 5 GHz
It is backwards compatible with 802.11a/b/g

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10
Q

What is the maximum speed, indoor range and set frequency of 802.11ac? Is it backwards compatible, if so with what?

A

1.3 Gbps (1300Mbps)
125 ft
5 GHz
It is backwards comatible with 802.11a/n.

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11
Q

What wireless protcols for close proximity are there?

A

Buetooth.
RFID.
NFC.

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12
Q

What standard is bluetooth? What frequency range does it use? What networks is it used in? Does it use any technologies?

A

802.15.1
2.4 - 2.485 GHz
PANs
It uses Adaptive Frequency Hopping in order to hop around its frequency range. This helps reduce interference from other bluetooth devices.

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13
Q

What frequency range does RFID use? What is the difference between active and passive RFID?

A

125 MHz to 950 MHz.
Active RFID use batteries to broadcast up to 100 metres.
Passive utilises their to use radio waves and read the tag. Their range is 25 metres.
RFID is used to uniuely identify items.

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14
Q

What is NFC? What frequency does it use? What is it used for? What is it used in?

A

A subsidiary of the RFID standard.
13.56MHz
It is designed to be a secure method to compleet transactions.
Based on a unique ID, the tansaction is paid against a pre-paid account or bank account. It is also used in mass-transportation services, public parking sector and many other consumer services.

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15
Q

What are the two smart home standards? Waht form of network are they used in?

A

Zigbee and Z-Wave. They are used in a wireless mesh network.

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16
Q

What standard is Zigbee?
What is its frequency operation range?
What is its data rate?
How many devices can it support?

A

802.15.4
868 MHz to 2.4GHz limited to 10-20 metres.
40/250 kb/s
65000 devices.

17
Q

What does Zigbee rely on?

A

A Zigbee coordinator to manage the cleint deviecs and maintain the network.

18
Q

What frequencies does Z-Wave operate on?
What is its range limit?
What is its data rate?
How many devices can it support?

A

A range of frequencies depending on where you live in the world.
It has a range limit of 100 metres.
It has a data rate of 9.6-100 kb/s.
It can support up to 232 devices in one wireless mesh network.

19
Q

What are the generations of cellular devices?

A 
1G/2G
2.5G
3G
3.5G
4G
LTE
5G
20
Q

What features does 1G support?
What features does 2G support?
What is the speed of 1/2G?

A

Analog voice calls only.
Digital voice, conference calls and caller ID.
Less than 9.6 kb/s

21
Q

What features does 2.5G support?

What is the speed of 2.5G?

A

Web browsing, short audio and video clips, games and download of applications and ring tones.
9.6 - 237 kb/s

22
Q

What features does 3G support?

What is the speed of 3G?

A

Full motion video, streaming music, 3D gaming and faster web rbowsing.
144 Kb/s to 2 Mb/s

23
Q

What features does 3.5G support?

What is the speed of 3.5G?

A

HIgh quality streaming video, high qualit video conferencing and VOIP.
400 Kb/s to 16 Mb/s

24
Q

What features does 4G support?

What is the speed of 4G?

A

IP based voice, gaming services and IPV6.

5.8 Mb/s to 672 Mb/s

25
Q

What does LTE mean?
What features does LTE support?
What is the speed of LTE?

A

Long Term Evolution is a term for a 4G technology that meets the 4G speed standards.
An advanced version of LTE significantly improves speeds whlst moving at high speeds such as a car in the highway.
50 - 100 MB/s while mobile and up to 1 Gb/s whilst stationary.

26
Q

When was 5G ratified?
What features does 5G support?
What is the speed of 5G?

A

June 2018, it is currently being implemented into current markets.
It supports AR, VR, smart homes, smart cars and any scenario where data tarnsfer occurs between devices.
400 Mb/s to 3 Gb/s download and 500 Mb/s to 1.5 Gb/s upload.

IT Essentials Chapter 5 (12 decks)

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