Wireless Network Standards - 2.3

Question 1

802.11a

Answer 1

1. Original 802.11 wireless standard (1999)
2. Operates in the 5GHz range
3. 54 Mbit/s
4. smaller range than 802.11b (Higher frequency is absorbed by objects in the way.
5. Not commonly seen today.

Question 2

802.11b

Answer 2

1. Original 802.11 wireless standard (1999)
2. operates in the 2.4GHz range
3. 11 Mbit/s
4. Better range than the 802.11a (fewer absorption issues)
5. More frequency issues (Microwaves, Bluetooth, cordless phones, baby monitors)
6. Not commonly seen today.

Question 3

802.11g

Answer 3

1. An “upgrade” to the 802.11b (2003)
2. operates at 2.4GHz range
3. 54 Mbit/s
4. backward-compatible with 802.11b
5. Has the same conflict issues as 802.11b

Question 4

802.11n (Wi-Fi 4)

Answer 4

1. An update to 802.11a/b/g (2009)
2. Operates at 5 GHz and/or 2.4 GHz (40 MHz channel widths)
3. 600 Mbit/s with 40 MHz mode and 4 antennas
4. Uses MIMO: Multiple-Input multiple-output | Multiple transmit and receive antennas

Question 5

802.11ac (Wi-Fi 5)

Answer 5

1. Approved in 2014
2. Operates at 5 GHz band (less crowded, more frequencies (up to 160 MHz channel bandwidth))
3. Increased channel bonding (larger bandwidth usage)
4. Faster data transfer
5. Eight MU-MIMO downlink streams (twice as many streams as 802.11n (nearly 7 Gbit/s)

Question 6

802.11ax (Wi-Fi 6)

Answer 6

1. Approved 2021
2. Operates at 5GHz and/or 2.4GHz (20, 40, 80, 160 Mhz channel widths.
3. 1,201 Mbits/s per channel (8 bi-directional MU-MIMO streams
4. OFDMA (Orthogonal frequency-division multiple access): works similarly to cellular communication, improves high-density installations

Question 7

Wi-Fi Standard Chart | 802.11 networking

Answer 7

“See screenshot”

Question 8

Long-range fixed wireless

Answer 8

1. Wireless access point in a house
2. Range of 40 to 50 meters.
3. Connect two buildings located miles from each other.
4. Directional Antennas (point-to-point connection)
5. additional licenses may be required.
6. Unlicensed 2.4Ghz or 5 GHz frequency
7. Signal strength (Regulations)
8. Need an expert to install it safely.

Question 9

RFID (Radio-frequency identification)

Answer 9

1. Anything that needs to be tracked
2. Access badge
3. Radar technology
4. Bi-directional communication

Question 10

NFC (Near field communication)

Answer 10

Two-way wireless communication

Question 11

Frequency

Question 12

Bluetooth

Answer 12

1. Removes wires
2. Uses 2.4GHz range (same as 802.11)
3. Short range (about 10m). Industrial Bluetooth devices can communicate over 100m.