Firewall Architecture Analysis. Which architecture for deploying a firewall is most commonly used in businesses today?

FIREWALL ARCHITECTURE ANALYSIS
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Which architecture for deploying a firewall is most commonly used in businesses today? Explain in detail Why?
When it comes to businesses and firewall selection, a lot of things should be put into consideration. These include the size and nature of the business, as well as the role of the network in question too. To some extent, even the budgetary allocations for the firewall can also be an issue. However, keeping everything constant, the most common and widely used firewall is the screened subnet firewall, in particular, those that come with the DMZ (Whitman, Mattord & Green, 2012). It is widely used in business because it protects the business from external intrusion through the use of three security features that it possesses.
Such a firewall has got an architecture that literally safeguards the delicate internal network from the outside by forming some form of external perimeter protection around it. Onto this perimeter protection lies a pair of routers that are loc...