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Professor M A+ 220-1101 Course Notes > 2.3 Wireless Network Standards > Flashcards

2.3 Wireless Network Standards Flashcards

1
Q

What is the wireless networking standard?

A

802.11

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2
Q

What is the wireless networking standard managed by?

A

the IEEE LAN/MAN Standards Committee

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3
Q

Who handles interoperability testing with Wi-Fi?

A

Wi-Fi Alliance (Wi-Fi is their trademark)

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4
Q

When was 802.11a released?

A

1999

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5
Q

What frequency does 802.11a operate in?

A

5 GHz range (other frequencies need special licensing)

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6
Q

What was the speed of 802.11a?

A

54 Mbit/s

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7
Q

Why did 802.11a have a smaller range than 802.11b?

A

The higher frequency is absorbed by objects in the way (5 GHz)

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8
Q

When was 802.11b introduced?

A

1999

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9
Q

What range does 802.11b operate in?

A

2.4 GHz

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10
Q

What was the speed of 802.11b?

A

11 Mbit/s

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11
Q

What was an issue that 802.11b and 802.11g ran into?

A

Frequency conflict (baby monitors, microwaves, cordless phones, Bluetooth) from being in the 2.4 GHz range

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12
Q

When was 802.11g introduced?

A

2003

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13
Q

What frequency does 802.11g operate in?

A

2.4 GHz

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14
Q

What was the speed of 802.11g?

A

54 Mbit/s (similar to 802.11a)

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15
Q

802.11g is backward compatible with what standard?

A

802.11b

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16
Q

What is 802.11n also called?

A

Wi-Fi 4

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17
Q

When was 802.11n introduced?

A

2009

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18
Q

What frequency does 802.11n operate in?

A

5 GHz
and/or
2.4 GHz

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19
Q

What are the channel widths of 802.11n

A

40 MHz

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20
Q

What is the speed of 802.11n?

A

600 Mbit/s (40 MHz mode and 4 antennas)

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21
Q

802.11n uses ______

A

MIMO

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22
Q

What is MIMO? What standard uses this? (2)

A

Multiple-input Multiple-output
(multiple transmit and receive antennas)

802.11n uses this, and 802.11ac

23
Q

802.11ac is also called what?

A

Wi-Fi 5

24
Q

802.11ac was introduced when?

A

2014

25
Q

What band does 802.11ac operate in?

A

5 GHz (less crowded, more frequencies)

26
Q

802.11ac has up to what size channel bandwidth?

A

160 MHz

27
Q

Which standard has increased channel bonding? What is channel bonding? (2)

A

802.11ac (Wi-Fi 5)

Larger bandwidth usage

28
Q

What standard has denser signaling modulation? What does that do?

A

802.11ac

faster data transfers

29
Q

How many MU-MIMO downlink streams does 802.11ac have?

A

8 (twice as many as 802.11n)

30
Q

8 MU-MIMO downlink streams offer speeds of ____. For which standard?

A

nearly 7 gigabits per second (Gbit/s)

802.11ac

31
Q

802.11ax is also called what?

A

Wi-Fi 6

32
Q

802.11ax was approved what year?

A

2021

33
Q

802.11ax operates at what frequency?

A

5 GHz
and/or
2.4 GHz

34
Q

802.11ax uses what channel widths?

A

20, 40, 80, 160 MHz

35
Q

802.11ax’s 8 MU-MIMO streams reach what speeds?

A

1,200 Mbit/s per channel

36
Q

What does OFDMA stand for?

A

Orthogonal frequency-division multiple access (OFDMA)

37
Q

What is OFDMA?

A

It works similar to cellular communication and improves high-density installations

38
Q

What wireless standard uses OFDMA?

A

802.11ax

39
Q

What is the range you might get from a wireless access point in a house with stock antennas?

A

40 to 50 meters

40
Q

How would you try to connect 2 buildings located miles from each other?

A

With long-range fixed wireless; fixed directional antennas and increased signal strength

41
Q

Is there a lot of signal absorption or bounce outdoors?

A

No, minimal

42
Q

What are directional antennas?

A

Focused, point-to-point connection

43
Q

Where do you refer to for Wireless regulations?

A

Your country’s regulatory agency

44
Q

What frequencies are used for long-range fixed wireless?

A

2.4, 5 GHZ. Additional may be available, additional licensing may be required

45
Q

Who installs outdoor antenna installations?

A

An expert (be safe!)

46
Q

What does RFID stand for?

A

Radio Frequency Identification

47
Q

What are 4 examples of RFID?

A
  1. Access badges
  2. Inventory/Assembly line tracking
  3. Pet/Animal identification
  4. Anything that needs to be tracked
48
Q

What type of technology is RFID?

A

Radar (radio energy transmitted to the tag)

49
Q

How are RFID powered?

A

through Radio frequency, then ID is transmitted back

50
Q

What is active/powered RFID?

A

Requires a power source (not powered by RF)

51
Q

Radar (RFID) technology communicates in what direction?

A

bidirectional (1 way mostly though)

52
Q

NFC communicates in what direction?

A

2-way wireless

53
Q

NFC helps with ____ pairing

A

Bluetooth

54
Q

What technology is used for access tokens, identity cards, and other things that are short-range with encryption support?

A

NFC

Professor M A+ 220-1101 Course Notes (21 decks)

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