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Networking Basics
Uniform Resource Locators
Sockets
Server Sockets
Web Servers
Security, Firewalls and Proxies

If you're interested in doing anything with the Internet, or anything with local area network (LAN), then you need to know something about networking.  Java provides very good support for networking, and it's quite easy to use.  Indeed, that's one significant reason why Java has become so popular and successful.