Top-level domains are the air-traffic controllers of the Internet, routing requests for web sites to the proper numerical server address.

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While waiting for your ISP to deliver IPv6 connectivity, put together a plan for deploying IPv6 on your Internet-facing infrastructure, including your firewall, DNS servers and Web server.

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The episode spotlights the controversial subject of online profiling, whereby Internet ad server companies, such as DoubleClick and Engage, track Web surfers in order to strategically target banner ads and site content, as well as to help sites keep a running count of visitors.

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It uses standard Internet protocols, which means it can take advantage of the many server farms around the world that offer up Web pages.

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