It is Bandsteering a feature of the gateway which would force the client to associate. There are many incarnations of BS but the simple one is AP would simply blacklist client in on of the client or it will not accept probes in one band. The decision to steer could be based on Phy Rate, Number of clients in the band, channel utilization...etc. On some ...
The client chooses the SSID or WAP it tries to link with, usually by SSID. If the same SSID is present on multiple bands (multiple radios) it likely chooses the one promising the highest link rate which depends on signal strength.
The major difference is that in a mesh network, nodes forward between other nodes. In a simple ad-hoc network, nodes must see each other to communicate.
In either network, a node can use multiple radios for multiple channels and even forward between them in a mesh. Nodes must be on the same channel in order to transmit to each other.
Routing is configured in layer3 devices, packet with destination ip address checks for matching route entry in other words. Routing is the process of selecting a path for traffic in a network.
If two static routes are configured towards same destination
Path selection will depends upon lowest AD value.
Path selection ...