The figure shows two networks.  Network A consists of a PC connected to router six, which is connected to router seven.  Router seven is connected to a server.  Network B consists of a PC connected to a switch.  The switch is connected to router three. Router three is connected to Router four with a serial connection. Router three is also connected to router five with an Ethernet connection.  Router five is also connected to router four with an Ethernet connection.  Router four is connected to a server, and router five is connected to a wireless router that has a tablet connected to it.