2.3 Wireless Network Standards

Question 1

What is the wireless networking standard?

Answer 1

802.11

Question 2

What is the wireless networking standard managed by?

Answer 2

the IEEE LAN/MAN Standards Committee

Question 3

Who handles interoperability testing with Wi-Fi?

Answer 3

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

Question 4

When was 802.11a released?

Answer 4

1999

Question 5

What frequency does 802.11a operate in?

Answer 5

5 GHz range (other frequencies need special licensing)

Question 6

What was the speed of 802.11a?

Answer 6

54 Mbit/s

Question 7

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

Answer 7

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

Question 8

When was 802.11b introduced?

Answer 8

1999

Question 9

What range does 802.11b operate in?

Answer 9

2.4 GHz

Question 10

What was the speed of 802.11b?

Answer 10

11 Mbit/s

Question 11

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

Answer 11

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

Question 12

When was 802.11g introduced?

Answer 12

2003

Question 13

What frequency does 802.11g operate in?

Answer 13

2.4 GHz

Question 14

What was the speed of 802.11g?

Answer 14

54 Mbit/s (similar to 802.11a)

Question 15

802.11g is backward compatible with what standard?

Answer 15

802.11b

Question 16

What is 802.11n also called?

Answer 16

Wi-Fi 4

Question 17

When was 802.11n introduced?

Answer 17

2009

Question 18

What frequency does 802.11n operate in?

Answer 18

5 GHz
and/or
2.4 GHz

Question 19

What are the channel widths of 802.11n

Answer 19

40 MHz

Question 20

What is the speed of 802.11n?

Answer 20

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

Question 21

802.11n uses ______

Answer 21

MIMO

Question 22

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

Answer 22

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

802.11n uses this, and 802.11ac

Question 23

802.11ac is also called what?

Answer 23

Wi-Fi 5

Question 24

802.11ac was introduced when?

Answer 24

2014

Question 25

What band does 802.11ac operate in?

Answer 25

5 GHz (less crowded, more frequencies)

Question 26

802.11ac has up to what size channel bandwidth?

Answer 26

160 MHz

Question 27

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

Answer 27

802.11ac (Wi-Fi 5) Larger bandwidth usage

Question 28

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

Answer 28

802.11ac faster data transfers

Question 29

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

Answer 29

8 (twice as many as 802.11n)

Question 30

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

Answer 30

nearly 7 gigabits per second (Gbit/s) 802.11ac

Question 31

802.11ax is also called what?

Answer 31

Wi-Fi 6

Question 32

802.11ax was approved what year?

Answer 32

2021

Question 33

802.11ax operates at what frequency?

Answer 33

5 GHz and/or 2.4 GHz

Question 34

802.11ax uses what channel widths?

Answer 34

20, 40, 80, 160 MHz

Question 35

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

Answer 35

1,200 Mbit/s per channel

Question 36

What does OFDMA stand for?

Answer 36

Orthogonal frequency-division multiple access (OFDMA)

Question 37

What is OFDMA?

Answer 37

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

Question 38

What wireless standard uses OFDMA?

Answer 38

802.11ax

Question 39

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

Answer 39

40 to 50 meters

Question 40

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

Answer 40

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

Question 41

Is there a lot of signal absorption or bounce outdoors?

Answer 41

No, minimal

Question 42

What are directional antennas?

Answer 42

Focused, point-to-point connection

Question 43

Where do you refer to for Wireless regulations?

Answer 43

Your country's regulatory agency

Question 44

What frequencies are used for long-range fixed wireless?

Answer 44

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

Question 45

Who installs outdoor antenna installations?

Answer 45

An expert (be safe!)

Question 46

What does RFID stand for?

Answer 46

Radio Frequency Identification

Question 47

What are 4 examples of RFID?

Answer 47

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

Question 48

What type of technology is RFID?

Answer 48

Radar (radio energy transmitted to the tag)

Question 49

How are RFID powered?

Answer 49

through Radio frequency, then ID is transmitted back

Question 50

What is active/powered RFID?

Answer 50

Requires a power source (not powered by RF)

Question 51

Radar (RFID) technology communicates in what direction?

Answer 51

bidirectional (1 way mostly though)

Question 52

NFC communicates in what direction?

Answer 52

2-way wireless

Question 53

NFC helps with ____ pairing

Answer 53

Bluetooth

Question 54

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

Answer 54

NFC