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Computer Networksknowledge~10 mins

Wi-Fi standards (802.11 a/b/g/n/ac/ax) in Computer Networks - Step-by-Step Execution

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Concept Flow - Wi-Fi standards (802.11 a/b/g/n/ac/ax)
Start: Wi-Fi Standards
802.11a: 1999, 5 GHz, 54 Mbps
802.11b: 1999, 2.4 GHz, 11 Mbps
802.11g: 2003, 2.4 GHz, 54 Mbps
802.11n: 2009, 2.4/5 GHz, up to 600 Mbps
802.11ac: 2013, 5 GHz, up to 3.5 Gbps
802.11ax (Wi-Fi 6): 2019, 2.4/5 GHz, up to 9.6 Gbps
End: Faster, better Wi-Fi
Wi-Fi standards evolved over time, each improving speed, frequency, and features step-by-step.
Execution Sample
Computer Networks
Standard | Year | Frequency | Max Speed
802.11a | 1999 | 5 GHz     | 54 Mbps
802.11b | 1999 | 2.4 GHz   | 11 Mbps
802.11g | 2003 | 2.4 GHz   | 54 Mbps
802.11n | 2009 | 2.4/5 GHz | 600 Mbps
802.11ac| 2013 | 5 GHz     | 3.5 Gbps
802.11ax| 2019 | 2.4/5 GHz | 9.6 Gbps
This table shows the main Wi-Fi standards with their release year, frequency band, and maximum speed.
Analysis Table
StepStandardYearFrequency BandMax SpeedKey Feature
1802.11a19995 GHz54 MbpsFirst 5 GHz Wi-Fi, faster than b
2802.11b19992.4 GHz11 MbpsPopular, longer range but slower
3802.11g20032.4 GHz54 MbpsFaster 2.4 GHz, backward compatible with b
4802.11n20092.4/5 GHz600 MbpsDual band, MIMO for speed and range
5802.11ac20135 GHz3.5 GbpsWide channels, MU-MIMO for multiple devices
6802.11ax (Wi-Fi 6)20192.4/5 GHz9.6 GbpsImproved efficiency, better in crowded areas
7End---Latest standard with highest speed and efficiency
💡 Reached latest Wi-Fi standard 802.11ax with highest speed and efficiency improvements.
State Tracker
StandardFrequency BandMax Speed
802.11a5 GHz54 Mbps
802.11b2.4 GHz11 Mbps
802.11g2.4 GHz54 Mbps
802.11n2.4/5 GHz600 Mbps
802.11ac5 GHz3.5 Gbps
802.11ax2.4/5 GHz9.6 Gbps
Key Insights - 3 Insights
Why does 802.11b have a slower speed than 802.11a even though they were released the same year?
802.11b uses the 2.4 GHz band which has more interference and lower max speed (11 Mbps), while 802.11a uses 5 GHz with less interference and higher speed (54 Mbps), as shown in execution_table rows 1 and 2.
Why is 802.11n faster than 802.11g even though both support 2.4 GHz?
802.11n supports both 2.4 and 5 GHz bands and uses MIMO technology to send multiple data streams, increasing speed up to 600 Mbps, unlike 802.11g which maxes at 54 Mbps (see execution_table rows 3 and 4).
What makes 802.11ax (Wi-Fi 6) better for crowded places?
802.11ax improves efficiency with technologies like OFDMA and better MU-MIMO, allowing many devices to connect smoothly, as noted in execution_table row 6.
Visual Quiz - 3 Questions
Test your understanding
Look at the execution_table at step 4. What is the maximum speed of 802.11n?
A3.5 Gbps
B600 Mbps
C54 Mbps
D11 Mbps
💡 Hint
Check the 'Max Speed' column at step 4 in the execution_table.
At which step does the Wi-Fi standard first support both 2.4 GHz and 5 GHz bands?
AStep 3 (802.11g)
BStep 5 (802.11ac)
CStep 4 (802.11n)
DStep 6 (802.11ax)
💡 Hint
Look at the 'Frequency Band' column in the execution_table for dual band support.
If 802.11ac supported 2.4 GHz as well, how would the frequency band column change at step 5?
AIt would show '2.4/5 GHz'
BIt would remain '5 GHz'
CIt would show '2.4 GHz' only
DIt would be blank
💡 Hint
Check how dual band is represented in the frequency band column for 802.11n and 802.11ax.
Concept Snapshot
Wi-Fi standards evolved from 802.11a/b/g to n, ac, and ax.
Each new standard improved speed and frequency bands.
2.4 GHz offers longer range but slower speeds; 5 GHz is faster but shorter range.
MIMO and OFDMA technologies boost speed and efficiency.
802.11ax (Wi-Fi 6) is the latest, best for crowded networks.
Full Transcript
Wi-Fi standards started with 802.11a and 802.11b in 1999, differing mainly by frequency and speed. 802.11a used 5 GHz for faster speeds (54 Mbps), while 802.11b used 2.4 GHz with slower speed (11 Mbps). Later, 802.11g improved 2.4 GHz speeds to 54 Mbps. The 802.11n standard introduced dual-band support (2.4 and 5 GHz) and MIMO technology, increasing speeds up to 600 Mbps. Then 802.11ac focused on 5 GHz with wider channels and MU-MIMO, reaching up to 3.5 Gbps. The latest, 802.11ax or Wi-Fi 6, supports both bands with better efficiency and speeds up to 9.6 Gbps, ideal for crowded environments. This progression shows how Wi-Fi technology improved over time to provide faster and more reliable wireless connections.