Objective 2.4Network Implementation· 1 min read
Wireless Standards and Technologies
Wireless standards and technologies
What you will learn
- Recall the key difference between the 2.4 GHz and 5 GHz bands.
- Distinguish common 802.11 standards by their marketing names (Wi-Fi 4/5/6).
- Explain channel width's effect on speed and interference.
- Choose the right band or standard for a given scenario (range, congestion, speed).
Every Wi-Fi standards question boils down to one trade-off: longer waves (2.4 GHz) travel farther and penetrate walls better but are slower and more congested, while shorter waves (5 GHz and up) are faster and less congested but have shorter range.
2.4 GHz vs. 5 GHz
| 2.4 GHz | 5 GHz | |
|---|---|---|
| Range | Longer — penetrates walls better | Shorter — more affected by obstacles |
| Max speed | Lower | Higher |
| Congestion | Higher — a narrower band shared with Bluetooth and other devices | Lower — a wider band with more channels |
Standard naming
| Wi-Fi 4 (802.11n) | The first standard to widely support MIMO (multiple antennas) — operates on both 2.4 and 5 GHz. |
|---|---|
| Wi-Fi 5 (802.11ac) | Operates on 5 GHz only, and significantly raises max speed over 802.11n. |
| Wi-Fi 6 (802.11ax) | Adds OFDMA to serve multiple devices more efficiently in crowded locations, and operates on both bands. |
| Channel Width | The bandwidth allocated to a single channel — wider means higher speed but more interference with adjacent channels. |
What matters on the exam
- The marketing generation number (Wi-Fi 4/5/6) is easier to recall than the 802.11 code itself — but the exam may use either name.
- "We need longer range through many walls" points to 2.4 GHz; "we need higher speed in a crowded place" points to 5 GHz or Wi-Fi 6.
Quick check
Answer in your head first, then reveal.
Which frequency band penetrates walls better?Reveal the answer
2.4 GHz.
Which standard adds OFDMA to improve efficiency in crowded locations?Reveal the answer
Wi-Fi 6 (802.11ax).
What happens if channel width increases?Reveal the answer
Potential max speed rises, but interference with adjacent channels increases.
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Your next step
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Sources
Used to verify the facts. The writing is original to Passuit.