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       I dedicate this book to the Lord Jesus Christ through Whom all things were created and in Whom all things hold together

Acknowledgments

      I’d like to thank the following people who helped create this CCNP Enterprise Certification Study Guide: Exam 350-401. A special thanks to Kenyon Brown, senior acquisitions editor, for the opportunity to write this book. Thanks to John Sleeva, project editor, for pushing me to meet my deadlines. His suggestions and edits helped make this book more user friendly. Thanks also go to Christine O’Connor, production editor; Pete Gaughan, content enablement manager; and Louise Watson at Word One, proofreader. Jon Buhagiar reviewed the chapters and questions for technical accuracy. His comments guided by his expertise helped make this book more practical, accurate, and well rounded.

About the Author

      Ben Piper is a networking and cloud consultant who has authored multiple books including the AWS Certified Solutions Architect Study Guide: Associate SAA-C01 Exam, Second Edition (Sybex, 2019), AWS Certified Cloud Practitioner Study Guide: Foundational CLF-C01 Exam (Sybex, 2019), and Learn Cisco Network Administration in a Month of Lunches (Manning, 2017). You can contact Ben by visiting his website https://benpiper.com.

      CONTENTS

      1  Cover

      2  Acknowledgments

      3  About the Author

      4  Introduction What Does This Book Cover? Interactive Online Learning Environment and Test Bank Exam Objectives Objective Map Assessment Test Answers to Assessment Test

      5  Chapter 1: Networking Fundamentals The OSI Model Layer 1: The Physical Layer Layer 2: The Data Link Layer Layer 3: The Network Layer Layer 4: The Transport Layer Summary Exam Essentials Review Questions

      6  Chapter 2: Spanning Tree Protocols The Need for Spanning Tree VLANs and Trunking Rapid

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