Protocols for Wireless Networking

Question 1

What was the first Wi-Fi standard?

Answer 1

802.11a

Question 2

What frequency did 802.11a use?

Answer 2

5 GHz

Question 3

What was the maximum speed of 802.11a?

Answer 3

54 Mbps

Question 4

What was the range like for 802.11a?

Answer 4

Very low range and blocked by objects easily

Question 5

What frequency did 802.11b use?

Answer 5

2.4 Ghz

Question 6

What speed could 802.1b achieve?

Answer 6

11 Mbps

Question 7

What was the range of 802.11b compared to 802.11a?

Answer 7

802.11b had a much better range

Question 8

What was are the downsides about 802.11b?

Answer 8

• Low speed (11 Mbps)
• Interference from household devices sharing the same frequency

Question 9

What is the frequency of 802.11g?

Answer 9

2.4 Ghz

Question 10

What was the maximum speed of 802.11g?

Answer 10

54 Mbps

Question 11

What was special about the hardware for 802.11g?

Answer 11

It was backward compatible with 802.11b

Question 12

How does 802.11g compare to 802.11a/b

Answer 12

It can achieve the 54 Mbps speed of 802.11a whilst having more range.

Question 13

What was the drawback of 802.11g?

Answer 13

Had the issue interference issues due to the 2.4 Ghz frequency

Question 14

What frequency does 802.11n work on?

Answer 14

Both 2.4GHz and 5GHz

Question 15

What was the theoretical speed of 802.11n?

Answer 15

600 Mbps

Question 16

What was the innovation of 802.11n?

Answer 16

Multiple-Input Multiple-Output antennas (MIMO)

Question 17

What is MIMO?

Answer 17

(Multiple-Input Multiple-Output antennas): Allowed multiple antennas (access points) on a router working in tandem which increased speed

Question 18

What is the other name for 802.11ac?

Answer 18

WiFi 5

Question 19

What frequency does 802.11ac (WiFi 5) operate on?

Answer 19

Only 5GHz

Question 20

How does 802.11ac (WiFi 5) achieve faster speeds?

Answer 20

Using wider channels through a technique called channel bonding, which allows more data to pass through

Question 21

What is the theoretical speed for 802.11ac (WiFi 5)?

Answer 21

7 Gb/s

Question 22

What is the other name for 802.11ax?

Answer 22

WiFi 6

Question 23

What frequency dos 802.11ax (WiFi 6) operate on?

Answer 23

Both 2.4 GHz and 5 GHz

Question 24

What is the theoretical speed of 802.11ax (WiFi 6)?

Answer 24

14 Gbps

Question 25

What is the other name of 802.11ax-2021?

Answer 25

Wi-Fi 6E

Question 26

Is Wi-Fi 6E available for all countries?

Answer 26

No

Question 27

What frequency does Wi-Fi 6E use?

Answer 27

6 GHz

Question 28

What devices are supported on 802.11ax-2021 (Wi-Fi 6E)?

Answer 28

Only 802.11ax devices supported on 6 GHz

Question 29

What is the benefit of 802.11ax-2021 small backwards compatability?

Answer 29

It makes it more efficient, improving speeds

Question 30

What are the two type of wireless frequency (regulations)?

Answer 30

Licensed and unlicensed

Question 31

What is a licensed frequency?

Answer 31

A company needs to buy a license o transmit in that frequency

Question 32

What is an unlicensed frequency?

Answer 32

Everyone can use this frequency to transmit data. Providing rules are followed (dependent on country).

Question 33

Are Wi-Fi frequencies licensed or unlicensed?

Answer 33

Unlicensed.

Question 34

Where are Wi-Fi regulations hardcoded into?

Answer 34

The wireless router

Question 35

How do Wi-Fi regulations affect the different frequency bands?

Answer 35

It regulates the power. So 2.4 GHz can send a lot more power through an antenna giving it more range and penetration compared to 5 and 6 which have reduced power.

Question 36

How many channels can 2.4 GHz be split into?

Answer 36

14 channels

Question 37

What is a channel in terms of Wi-Fi frequencies?

Answer 37

A channel is a different sub-frequency range on which communication is done

Question 38

What is the range of each transmission channel in 2.4 GHz WiFi channels?

Answer 38

20-22 MHz

Question 39

How many MHz is each channel separated by in 2.4GHz Wi-Fi channels?

Answer 39

16-22 MHz

Question 40

What is the benefit of being able to switch Wi-Fi channels?

Answer 40

To switch to a channel with less interference, increasing internet speed and reliability

Question 41

What are the three non-overllaping channels in 2.4 GHz?

Answer 41

1, 6, and 11

Question 42

How many 20MHz non-overlapping channels can we have in 5GHz channels?

Answer 42

24

Question 43

What different channel sizes can 5 GHz have?

Answer 43

The can have wide channels of 40, 80 or 160 MHz

Question 44

How are wide channels in 5GHz channels created?

Answer 44

Banding together 20 MHz channels

Question 45

What are the benefits of wide channels?

Answer 45

More data can be passed through

Question 46

What channel size can 6 GHz achieve?

Answer 46

7 x 160 MHz channels, providing extra fast low interreference speeds

Question 47

What is Bluetooth?

Answer 47

Wireless standard for exchanging data over short distances

Question 48

How is Bluetooth's batter consumption compared to WiFi?

Answer 48

It has a very low battery consumption

Question 49

How does a low battery consumption affect Bluetooth?

Answer 49

Reduces the speed of data transmission

Question 50

What is NFC?

Answer 50

Short range communication between devices at a very low range

Question 51

What are the two types of NFC's?

Answer 51

Passive or active

Question 52

What is a passive NFC?

Answer 52

One that is activated by an active NFC. They are unpowered

Question 53

What are some examples of a passive NFC?

Answer 53

Bus card Credit Cards

Question 54

What are some examples of an active NFC?

Answer 54

Phone Card reader

Question 55

What is a Radio-Frequency Identification device (RFID)?

Answer 55

Technology that can have digital data encoded in RFID tags or smart labels that can be captured by radio waves

Question 56

What does an RFID not need that a barcode does?

Answer 56

Direct line-of-sight

Question 57

What are RFID tags used for?

Answer 57

To track items