Wireless Network Technologies

Question 1

What organization standardizes Wi-Fi networks?

Answer 1

IEEE (Institute of Electrical and Electronics Engineers)

Question 2

What IEEE committee is responsible for Wi-Fi standards?

Answer 2

802.11 Committee

Question 3

What is the new naming convention for 802.11ac?

Answer 3

Wi-Fi 5

Question 4

What is the new naming convention for 802.11ax?

Answer 4

Wi-Fi 6

Question 5

What is the new naming convention for 802.11be?

Answer 5

Wi-Fi 7

Question 6

What are the three main frequency ranges used by Wi-Fi?

Answer 6

2.4 GHz, 5 GHz, 6 GHz

Question 7

What is the purpose of grouping frequencies into channels?

Answer 7

To simplify reference and reduce the need to memorize exact frequencies

Question 8

What is the bandwidth of a Wi-Fi channel?

Answer 8

Typically 20, 40, 80, or 160 MHz

Question 9

How many non-overlapping 20 MHz channels are available in the 2.4 GHz spectrum?

Answer 9

3

Question 10

Why is the 5 GHz spectrum preferred over 2.4 GHz in crowded areas?

Answer 10

More available frequencies and less interference

Question 11

What wireless technology is commonly used for wireless headsets and speakers?

Answer 11

Bluetooth

Question 12

What frequency range does Bluetooth use?

Answer 12

2.4 GHz (ISM band)

Question 13

What does ISM stand for?

Answer 13

Industrial, Scientific, and Medical band

Question 14

What is the typical maximum range of consumer Bluetooth devices?

Answer 14

About 10 meters

Question 15

What does RFID stand for?

Answer 15

Radio Frequency Identification

Question 16

What are some common uses of RFID?

Answer 16

Access badges, product tracking, pet identification

Question 17

How do passive RFID tags get power?

Answer 17

From the radio frequency energy of the scanner

Question 18

What does NFC stand for?

Answer 18

Near-Field Communication

Question 19

How does NFC differ from RFID?

Answer 19

NFC allows two-way communication; RFID is generally one-way

Question 20

What is a common use of NFC?

Answer 20

Mobile payments, device pairing, access control

Question 21

The 802.11 standard is only used for Wi-Fi networks.

Answer 21

True

Question 22

Wi-Fi 6 refers to the 802.11ax standard.

Answer 22

True

Question 23

The 6 GHz spectrum is available for all Wi-Fi standards.

Answer 23

False (Only Wi-Fi 6E and later support 6 GHz)

Question 24

Bluetooth uses the 5 GHz frequency range.

Answer 24

False (Bluetooth uses 2.4 GHz)

Question 25

RFID tags always require a battery.

Answer 25

False (Passive RFID tags do not need a battery)

Question 26

NFC can only be used for payments.

Answer 26

False (NFC is also used for device pairing and access control)

Question 27

The 2.4 GHz spectrum has more non-overlapping channels than the 5 GHz spectrum.

Answer 27

False (5 GHz has more non-overlapping channels)

Question 28

Wi-Fi channels are used to simplify frequency reference.

Answer 28

True

Question 29

ISM band frequencies require a license to use.

Answer 29

False (ISM band frequencies are unlicensed)

Question 30

Active RFID tags have a longer range than passive RFID tags.

Answer 30

True

Question 31

A user reports slow Wi-Fi in a crowded apartment building. What frequency range should you recommend to reduce interference?

Answer 31

5 GHz or 6 GHz

Question 32

A company wants to deploy a wireless network with the highest possible throughput. What channel bandwidth should be used?

Answer 32

160 MHz (if supported by the standard and environment)

Question 33

A user’s Bluetooth headset keeps disconnecting when they move more than a few meters away. What is the likely cause?

Answer 33

The user is exceeding the typical 10-meter range of Bluetooth

Question 34

A warehouse wants to track inventory using wireless tags that can be scanned from a distance. What type of RFID tags should be used?

Answer 34

Active RFID tags

Question 35

A user wants to use their smartphone to make a contactless payment. What wireless technology is used?

Answer 35

NFC (Near-Field Communication)

Question 36

A user is setting up a new wireless printer and wants to avoid typing in the Wi-Fi password. What technology can be used to simplify the setup?

Answer 36

NFC (to transfer Wi-Fi credentials from a phone to the printer)

Question 37

A network administrator wants to deploy a Wi-Fi network with the least interference in a busy office. What frequency range and channel width should be recommended?

Answer 37

5 GHz or 6 GHz, with 20 MHz or 40 MHz channels

Question 38

A pet owner wants to ensure their pet can be identified if lost. What technology can be implanted in the pet?

Answer 38

Passive RFID tag

Question 39

A user is experiencing interference on their 2.4 GHz Wi-Fi network. What could be causing the interference?

Answer 39

Other Wi-Fi networks, Bluetooth devices, or ISM band devices

Question 40

A company wants to use wireless badges for building access. What technology is most suitable?

Answer 40

RFID