I’d say that depends. Some consumer routers may have guest network and client isolation on it though I doubt most do. Higher end routers support vlans can be configured that way and could be configured in many other wise such as talking to network 1 but not 2 or 3. For instance, I have IOT vlan allowed to connect to my server vlan for DNS since I self host DNS, but my general VLAN for personal trusted devices does can’t be accessed by IOT.
I’d say that depends. Some consumer routers may have guest network and client isolation on it though I doubt most do. Higher end routers support vlans can be configured that way and could be configured in many other wise such as talking to network 1 but not 2 or 3. For instance, I have IOT vlan allowed to connect to my server vlan for DNS since I self host DNS, but my general VLAN for personal trusted devices does can’t be accessed by IOT.