Sorry for brevity, using phone.
If you set both SSIDs to "Banana", then the 2.4 only devices will automatically join the 2.4 banana only, likewise with 5ghz only devices, will only join the 5ghz version of Banana. They will be incapable of joining the wrong one, and modern 5ghz devices will join whichever is fastest*
So they will be separate, in terms of getting devices to have internet, but will be together in terms of "being in the same wifi", which is essential for things like Spotify via Google home to work.
Such services that require all client devices to be on the same network, will suddenly start working properly.
ISP should not advise to keep separate any more. Maybe 5+ years ago, but things have changed. Devices are smarter now.
* 2.4 GHz might have lower bandwidth, but can maintain it over a greater range than 5ghz. A smartphone might join 2.4 by choice when distant from router.
5ghz and related standard only matter if you are transferring files between devices over wifi. It cannot improve internet as the internet connection is a much slower bottleneck than 2.4ghz wifi.
If you set both SSIDs to "Banana", then the 2.4 only devices will automatically join the 2.4 banana only, likewise with 5ghz only devices, will only join the 5ghz version of Banana. They will be incapable of joining the wrong one, and modern 5ghz devices will join whichever is fastest*
So they will be separate, in terms of getting devices to have internet, but will be together in terms of "being in the same wifi", which is essential for things like Spotify via Google home to work.
Such services that require all client devices to be on the same network, will suddenly start working properly.
ISP should not advise to keep separate any more. Maybe 5+ years ago, but things have changed. Devices are smarter now.
* 2.4 GHz might have lower bandwidth, but can maintain it over a greater range than 5ghz. A smartphone might join 2.4 by choice when distant from router.
5ghz and related standard only matter if you are transferring files between devices over wifi. It cannot improve internet as the internet connection is a much slower bottleneck than 2.4ghz wifi.
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