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Your router broadcasts both 2.4GHz and 5GHz Wi-Fi.

What's the usual rule for choosing?

Nearby, take the faster 5GHz; through walls and far away, the better-penetrating 2.4GHz
5GHz is faster but weaker through obstacles; 2.4GHz is slower but travels farther. It's radio physics, not a ranking — the right answer depends on where you're standing.
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