Asmall law office has a network with three switches (8 ports), one hub (4 ports), and one router (2 ports). switch 1 (switchport 8) is connected to an interface port (fastethernet0/0) on the router. switch 2 (switchport 8) and switch 3 (switchport 8) are connected to switch 1 (switchports 1 and 2). the hub has three computers plugged into it on ports 1, 2, and 3. the fourth port on the hub is connected to the router's other interface port (fastethernet0/1). based on the configuration described here, how many broadcast domains are there within this network?