If you don't know the rules for the Internet, intranets, and extranets, you can't play the game! With TCP/IP For Dummies, 2nd Edition, you'll discover the communication rules for networks as well as the protocols for networks connected to the Internet. TCP/IP is no longer just for network administrators. This book helps you understand everything you've been hearing about TCP/IP in no time. Inside, find helpful advice on how to Find out the rules for all communications over the Internet Understand how the World Wide Web would crumble without TCP/IP Demystify TLAs (Three Letter Acronyms) like OSI, NIS, DNS, and ARP Enhance your network by figuring out how devices like modems, bridges, and routers work with TCP/IP Discover how the next generation of IP will affect your network Keep the bad guys out by securing your networks with firewalls, encryption, and other techniques Discover answers to your most frequently asked questions, such as: Are security and TCP/IP mutually exclusive? Uncover the difference between the Internet, any internet, and an intranet Plus, Candace and Marshall's Top Ten Lists: Ten types of networks Ten strange but real TCP/IP network devices Ten important requests for comments (RFCs)