CompTIA A+ 1101 Wireless Network Standards & Channels

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6 Terms

1
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802.11a

- one of the original 802.11 wireless standards

- operates in the 5 Ghz range, or other frequencies with special licensing

- 54 megabits per second speeds

- smaller range than 802.11b, which operates in the 2.4 Ghz range (due to the higher, 5 Ghz frequency being absorbed by objects in the way)

- not commonly seen today

2
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802.11b

- also one of the original 802.11 wireless standards

- operates in the 2.4 Ghz range

- 11 megabits per second speeds (much slower than 802.11a)

- better range than 802.11a, due to less absorption problems

- more frequency conflict (less channels)

- not commonly seen today

3
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802.11g

- an upgrade to 802.11b

- operates in the 2.4 Ghz range

- 54 megabits per second speeds (similar to 802.11a)

- backwards compatible with 802.11b (802.11b devices are compatible with an 802.11g network)

- 2.4 Ghz frequency conflict issues

4
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802.11n (WiFi 4)

- upgrade from 802.11a, 802.11b, and 802.11g

- operates at both 5 Ghz and 2.4 Ghz

- 40 megahertz channel width

- maximum theoretical speeds of 600 megabits per second, when using 40 Mhz mode and 4 antennas

- introduced MIMO (multiple-input multiple-output), which allows devices to transfer much more information simultaneously, between the end station and the access point

5
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802.11ac (WiFi 5)

- significant improvements over 802.11n

- operates in the 5 Ghz range

- up to 160 Mhz channel bandwidth

- introduced denser signaling modulation (faster data transfers)

- 8 MU-MIMO (Multi User MIMO) downlink streams, for nearly 7 gigabits per second maximum total speeds

6
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802.11ax (WiFi 6)

- the successor to 802.11ac

- operates at 5 Ghz and 2.4 Ghz

- 20, 40, 80, and 160 Mhz channel widths (total possible throughput of about 1201 megabits per second, per channel)

- 8 bi-directional MU-MIMO streams, for nearly 10 gigabits per second maximum total speeds

- introduced orthogonal frequency-division multiple access (OFDMA) (works similarly to cellular communication, and improves high-density installations)