Are both 2.4GHz and 5GHz networks enabled by default?

I have a TC 4th Gen and, according to the box it has both 2.4Ghz and 5GHz networks. Simultaneously.
Questions: Is this so? What makes a device choose 2.4GHz or 5GHz?
Thanks!
Fernando

Is this so?
Yes. Both bands use the same wireless network name.
What makes a device choose 2.4GHz or 5GHz?
Assuming that a wireless device is capable of connecting to a 5 GHz band (an iPhone cannot), it will "look" at both bands and choose the band with the best quality...which is a combination of signal strength and low noise.
5 GHz signals are not as strong as 2.4 GHz signals, so if the computer is a few rooms away from the router, it likely will connect to the 2.4 GHz band because those signals penetrate and travel through obstructions more effectively. 5 GHz signals are absorbed more quickly by any obstructions.
You can "force" a device to only connect to the 5 GHz band by assigning a different name to that band using Wireless Network Options and then "point" the computer at that network. But, that is no guarantee that this will be a better connection. It might be inferior to the 2.4 GHz signal.
For most users, it is probably best to leave the router in its default settings and allow the wireless devices to choose and connect to the band with best quality. After all, isn't that what you want?
Want to know which band your Mac is connected to at any given time? Hold down the option key on your Mac while you click on the fan shaped AirPort icon at the top of the screen and look at the Channel info.

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First restart your mac and try again.
It could be
that the router and the TC are interfering wirelessly with each other.
You can check this by pressing the option key while clicking on the wireless icon on your screen
Open Wireless Diagnostics
enter your user password
Press CMD 4 then Scan
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Are both 2.4GHz and 5GHz networks enabled by default?

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