The names 2.4 GHz or 5 GHz refer to two radio frequency bands used by the WiFi network to transmit its signal. The main differences between the technologies are bandwidth, i.e. speed, and range, otherwise known as coverage.
Most WiFi-connected objects operate in the 2.4 GHz band (scales, printers, babyphones/cameras, voice assistants, etc.).
The 2.4 GHz frequency is the historical frequency that offers the greatest coverage and penetrates matter (walls, etc.) more easily. It is therefore used preferentially by connected objects.
The 5 GHz frequency band is more recent and less saturated, which means that the connection is more stable. It is up to 3 times faster than the 2.4 GHz band because it can use channel aggregation (802.11n/ac). This band is therefore generally used for video streaming (Netflix, YouTube), downloading or video games.
The 5GHz band, on the other hand, has more difficulty penetrating walls: that's why it's generally preferable to use a 5 GHz WiFi network if you're using WiFi in a single room and your box is located in the same room. This will ensure maximum throughput.
However, if you have to cross walls or floors, the safest connection is the 2.4GHz band.
To find out more about the configuration of the main boxes, please refer to the following article:
How to configure the 2.4 GHz WiFi network of the main internet box
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