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It was 99.99% of the time my Macbook and the Apple Airport Extreme were connected by 802.11ac, and today, nothing has changed, and they were shown to be connected by 802.11n all of a sudden, and it has been so for hours. (by pressing Option and clicking on the Wifi icon on the task bar).
How do I make it jump back to 802.11ac?
You can try simply turning WiFi off and then on again from the WiFi icon in the top bar.
If it still doesn’t work, you’ll need to check if you’ve made settings changes on the router – or if some source of interference has been introduced to the environment (such as another WiFi access point, or other electronical equipment). If this is the case, you can sometimes work around it by changing the WiFi channel used on the Airport Extreme from its settings.
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