802.11 Wireless Network

Question 1

802.11

Answer 1

Stand for Wireless network

• IEEE 802 standard

Question 2

802.11a

Answer 2

5 GHz
54 Mbit/s
Smaller range than 802.11b due to high frequency absorption by object in the way

Question 3

802.11b

Answer 3

2.4 GHz
11 Mbit/s
More frequency conflict
Better range than 802.11a, has less absorption problem

Question 4

802.11g

Answer 4

Upgrade to 802.11b
2.4 GHz
54 Mbit/s
Backward compatiable to 802.11b
Same frequency problem as 802.11b

Question 5

802.11n / Wi-Fi 4

Answer 5

5 GHz & 2.4 GHz
40 MHz channel width
4 x MIMO = 600 Mbit/s

Question 6

802.11ac / Wi-Fi 5

Answer 6

5 GHz
Improvement to 802.11n
160 MHz
8 x DL MU-MIMI = 6.9 Gbit/s (total)

Question 7

802.11ax / Wi-Fi 6

Answer 7

Successor of Wi-Fi 5
5 GHz & 2.4 GHz
20,40,80,160 MHz channels
8 x DL and UL MU-MIMO = 9.6 Gbit/s (total)

• 1201 Mbit/s per stream