Can gateway network have multiple networks/layers eg. Lets say a country has 10 gateways connected on 1 gateway network but one of these gateways is also connected to the international gateway networks?
You can configure that, but it will really be treated as one big one. You will need to establish some security zones to prevent cross traffic, if I understand correctly.
yes it clarifies my understanding - as you said its 1 big network with filters configured in security zone. thanks