How are a firewall and DMZ positioned in a network?
From Computer Network by Tanenbaum
What is the device (let me call it "A") between the DMZ and the internet? Is it the main router of the LAN for the organization?
What is the device (let me call it "B") between the device "A" just asked and the firewall? In other words, what is the device that the web server and email server connect to? Is it the same kind of devices which the two computers in the internal network connect to? Is it a hub?
Is the firewall not directly connected to device "A", but indirectly via device "B"?