Firewall architecture is represented by computer symbols connected by 
communication lines. In the middle is a rectangular box labelled "switched 
interior/exterior firewall". It is connected to a cloud labelled "Internet" 
directly above it.

Two lines from the left side of the firewall box connect it to two server 
computers labelled "Reverse proxies http--https". These computers are not 
connected to each other outside the firewall box.

Four lines from the right side of the firewall box connect it to two server 
computers labelled "HTTP Servers" in the upper right quadrant and to two 
server computers labelled "Servlet Servers" in the lower right quadrant. 
These four computers are not connected to each other outside the firewall box.

One line from the bottom of the firewall box connects to a horizontal line 
in the lower left quadrant labelled "Intranet". Also connected to the 
horizontal line are two server computers and a database.