Download PDF by Wendell Odom: CCNA INTRO Exam Certification Guide

By Wendell Odom

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Inside the postal service, both letters are processed. One letter gets sent to another post office, then another, and so on, until the letter gets delivered across the country. The local letter might go to the post office in your town and then simply be delivered to your friend across town, without going to another post office. So what does this all matter to networking? Well, the internetwork layer of the TCP/IP networking model, the Internet Protocol (IP), works much like the postal service. IP defines addresses so that each host computer can have a different IP address, just like the postal service defines addressing that allows unique addresses for each house, apartment, and business.

Researchers at various universities volunteered to help further develop the protocols surrounding the original department’s work. These efforts resulting in a competing networking model called TCP/IP. book Page 21 Wednesday, July 2, 2003 3:53 PM The TCP/IP Protocol Architecture 21 The world now had many competing vendor networking models and two competing standardized networking models. So what happened? TCP/IP won the war. Proprietary protocols are still in use today in many networks, but much less so than in the 1980s and 1990s.

Appendix B, “Binary to Decimal Conversion Table”—Lists decimal values 0 through 255, along with the binary equivalents. ■ Appendix C, “Using the Simulation Software for the Hands-on Exercises”—Provides instructions for accessing the NetSim network simulator that comes with the book. This appendix also lists the labs and scenarios from this book that can be performed using NetSim. When you are finished with the core chapters, you have several options on how to finish your exam preparation. Additional exercises in Chapter 16 provide a method of final preparation with more questions and exercises.

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