Administering an ISP Installation

Three Networks in One

The architecture for Mightyflight Toys is set up so that a firewall filters access to the Internet. Specifically, the firewall lets in data directed at the services listed in the previous section (SMTP, POP3, NNTP, and so forth), while filtering out unwanted data directed at the other servers. Behind the second router, the architecture is divided into three different networks:

• Front-end
• Back-end
• Administrative

For additional information, see the following:

• Advantages of This Topology
• Example: Querying a SQL Server

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