Extensive Practice Sets in each chapter include multiple choice questions and exercises, giving students and professors ample opportunity to check understanding of concepts. These sections reinforce concepts learned in the chapter. Summary sections at the end of chapters list major concepts learned in the chapter. This gives the students a brief summary of major concepts they should know, which helps them prepare for exams and learn important concepts. Hundreds of excellent figures, now enhanced with a second color, present technical concepts in a visual and intuitive manner. Can help students grasp what maybe difficult concepts. Six new chapters are included in the second edition:Chapter 14 Multicasting Routing Protocols Chapter 26 IP over ATM Chapter 27 Mobile IP Chapter 28 Real Time Traffic over the Internet Chapter 29 Internet Security Chapter 30 Private Networks