wireless network standards

Question 1

Wireless standards

Answer 1

Managed by the IEEE LAN/MAN
Standards Committee (IEEE 802)

Question 2

802.11a

Answer 2

One of the original 802.11 wireless standards
Operates in the 5 GHz range
54 Mbit/s
Not commonly seen today

Question 3

802.11b

Answer 3

Also an original 802.11 standard
Operates in the 2.4 GHz range
11 Mbit/s
Better range than 802.11a, less absorption problems
More frequency conflict
Not commonly seen today

Question 4

802.11g

Answer 4

An “upgrade” to 802.11b - June 2003
Operates in the 2.4 GHz range
54 Mbit/s - Similar to 802.11a
Backwards-compatible with 802.11b
Same 2.4 GHz frequency conflict problems as 802.11b

Question 5

802.11n (Wi-Fi 4)

Answer 5

The update to 802.11g, 802.11b, and 802.11a – October 2009
Operates at 5 GHz and/or 2.4 GHz
– 40 MHz channel widths
600 Mbit/s
40 MHz mode and 4 antennas
802.11n uses MIMO
(Multiple-input multiple-output)
– Multiple transmit and receive antennas

Question 6

802.11ac (Wi-Fi 5)

Answer 6

Significant improvements over 802.11n
Operates in the 5 GHz band – Less crowded, more frequencies
Increased channel bonding - Larger bandwidth usage
Denser signaling modulation – Faster data transfers
Eight MU-MIMO downlink streams – Twice as many streams as 802.11n

Question 7

802.11ax (Wi-Fi 6)

Answer 7

The successor to 802.11ac/Wi-Fi 5
Operates at 5 GHz and/or 2.4 GHz – 20, 40, 80, and 160 MHz channel widths
1,201 megabits per second per channel
Orthogonal frequency-division multiple access (OFDMA)

Question 8

RFID

Answer 8

Radio-frequency identification
Radar technology
– Access badges
– Inventory/Assembly line tracking
– Pet/Animal identification
– Anything that needs to be tracked

Question 9

NFC

Answer 9

Near field communication
Two-way wireless communication
Payment systems