TIL Wi-FI Generations
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TAGS: network certifications
On Network+ certification:
There's a question to explain the wifi versions and generations.
Wi-fi Generation #
| IEEE Standard | Frequency | Max Linkrate | How to remember |
|---|---|---|---|
| 802.11 (wi-fi 0) | 2.4Ghz | 2 Mbit | First version. OG version. |
| 802.11b (wi-fi 1) | 2.4Ghz | 11 Mbit | (b) - Base Version. Old. |
| 802.11a (wi-fi 2) | 5Ghz | 54 Mbit | (a) - Alpha, like Street Fighter Alpha. Faster. Stronger. |
| 802.11g (wi-fi 3) | 2.4Ghz | 54 Mbit | (g) - Goku. As strong as Alpha. |
| 802.11n (wi-fi 4) | 2.4, 5Ghz | 600 Mbit | (n) - Neutral zone. Does both freqs. Also 10x stronger. |
| 802.11ac (wi-fi 5) | 5Ghz | 3000 Mbit | (ac) - ACE. It's 5x stronger. |
| 802.11ax (wi-fi 6) | 2.4, 5Ghz | 6000+ Mbit | (ax) - AXE. It's twice as strong, and neutral zone. |
On Wiki, the max rate is different than what Network+ says? I dunno man.
Wi-fi Security #
WEP - Old version. Easy to hack. Single shared password.
WPA - uses tkip. Still uses some WEP under the hood. Uses EAP-TSL.
WPA2 - uses aes and ccmp. Also uses PKI for authentication (and EAP-TTSL)
Still has WPS (that button to allow anyone access for a few seconds).
REF:
https://en.wikipedia.org/wiki/Wi-Fi#Versions_and_generations
https://www.howtogeek.com/167783/htg-explains-the-difference-between-wep-wpa-and-wpa2-wireless-encryption-and-why-it-matters/
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Tagged: network