Back-End Servers
A back-end server can be thought of as a server that is required for the Internet service to operate, but does not need to be public-facing or have a publicly accessible IP address. An example of this is a database server and is shown in Figure 11-3.
These servers have to be able to communicate with the public-facing servers to fulfill the requests sent to them.
In Figure 11-3, you can see that the Web server for Mydomain.com is serving Web files for www.mydomain.com. The Web server runs a stock lookup database that is linked to a back-end SQL database running on a server in the same Layer 3 domain as the Web server. NAT is used to statically translate the Web server's private IP address of 192.168.1.10 to the public IP address ...
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