How many wlan are in a dual band router?

Question

WiFi

Interested in the following. If a dual band router creates two Wi-Fi networks (2.4 and 5GHz respectively) are they one wlan network? If a smartphone is connected to 5GHz, and will the laptop see its smartphone by 2.4?

Answer 1

Briefly - yes.
Long - these are 2 separate networks, combined into a bridge together with a switch.