2.4 Wireless Networking Protocols

Question 1

What are the 802.11 wireless protocol letters?

Answer 1

A, B, G, N, AC.

Question 2

Explain 802.11a

Answer 2

A wireless networking standard that operates in the 5-Ghz band with a theoretical maximum speed of 54 Mbps.

Question 3

Explain 802.11ac

Answer 3

A wireless networking standard that operates in the 5-GHz band and uses MIMO and MU-MIMO to achieve theoretical maximum speeds of 1+ Gbps.

Question 4

What does MIMO and MU-MIMO stand for?

Answer 4

MIMO = Multiple In/Multiple Out.
MU-MIMO = Multi User multiple in/multiple out.

Question 5

Explain 802.11b

Answer 5

A wireless networking standard that operates in the 2.4-GHz band with a theoretical maximum speed of 11 Mbps.

Question 6

Explain 802.11g

Answer 6

A wireless networking standard that operates in the 2.4-GHz band with a theoretical maximum speed of 54 Mbps and is backward compatible with 802.11b.

Question 7

Explain 802.11n

Answer 7

A wireless networking standard that can operate in BOTH the 2.4-GHz and 5-GHz bands and uses MIMO to achieve a theoretical maximum speed of 100+ Mbps.

Question 8

What are the two bands used on WiFi networks?

Answer 8

2.4-GHz, and 5-GHz.

Question 9

What channels are used in WiFi networks?

Answer 9

1 through 11.

Question 10

Why would you change a channel on a wireless router?

Answer 10

To avoid interference from other devices using the same channel, usually in a densely populated area.

Question 11

Which channels should you switch to if changing channels manually?

Answer 11

Channels 1, 6, or 11.

Question 12

What is bluetooth?

Answer 12

Bluetooth is designed to create small wireless networks pre-configured to do very specific jobs. Great examples are wearable technology, audio devices, and input devices such as keyboards and mice.

Question 13

What does NFC stand for?

Answer 13

NFC = Near Field Communication

Question 14

What is NFC used for?

Answer 14

NFC is usually used in mobile devices for things such as mobile payments.

Question 15

What does RFID stand for?

Answer 15

RFID = Radio Frequency Identification.

Question 16

What is RFID used for?

Answer 16

RFID is used in asset tags. An RFID scanner or reader can electronically read and identify even without line of sight to the item. Most RFID tags are passive meaning the tag receives all the power it needs from the scanners signal. An active RFID tag uses a battery or external power source to send out and receive signals.

Question 17

What is zigbee?

Answer 17

Zigbee is a completely open wireless networking protocol designed to address home automation challenges.

Question 18

What is Z-Wave?

Answer 18

Z-Wave is a proprietary standard for home automation.

Question 19

What is 3g?

Answer 19

It is a third generation cell data technology with real world speeds under 10 Mbps.

Question 20

What is 4g?

Answer 20

It is the fourth generation of cell data technology with theoretical download speeds of 1 Gbps (using LTE) and upload speeds of 100 Mbps.

Question 21

What is LTE?

Answer 21

LTE stands for Long Term Evolution. A fourth generation cell network technology supporting theoretical download speeds of 1 Gbps and upload speeds of 100 Mbps. It is now marketed and generally accepted as a true 4g technology.

Question 22

What is 5g?

Answer 22

It is a fifth generation cell data technology. Theoreticle speeds of up to 20 Gbps.