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The book breaks down the Internet/Networking into 4 layers ccna routing and switching 200 301 pdf ( did not use the application, session, and physical layers ) and explains them very well.  Excellent examples!  Well written.  In addition to those 4 layers the book goes over security, multimedia, and network management. I highly recommend this book to anyone who wants to know more about networking. Excellent book!!! ccna routing and switching 200 301 pdf Wendell provides a deep coverage of CCNA as well as the network itself.