Network Fundamentals, CCNA Exploration Companion Guide is the official supplemental textbook for the Network Fundamentals course in the Cisco® Networking Academy® CCNA® Exploration curriculum version 4. The course, the first of four in the new curriculum, is based on a top-down approach to networking. The Companion Guide, written and edited by Networking Academy instructor, is designed as a portable desk reference to use anytime, anywhere. Why it will sell The all-new and only authorized textbook for the new Cisco Networking Academy CCNA Exploration Network Fundamentals curriculum • A portable reference that supports the topics in the all-new Cisco Networking Academy CCNA Exploration Network Fundamentals curriculum aligning 1:1 with course modules • Features improved readability, enhanced topic explanations, real-world examples, and all-new graphical presentations • Written and Edited by leading Academy Instructors. Contents Comments for table of Contents Introduction 1. Living in a Network-Centric World 2. Communicating over the Network 3. Application Layer Functionality and Protocols 4. OSI Transport Layer 5. OSI Network Layer 6. Addressing the Network : IPv4 7. OSI Data Link Layer 8. OSI Physical Layer 9. Ethernet 10. Planning and Cabling Networks 11. Configuring and Testing Your Network Appendix check your understanding and challenge Questions Answer Key Glossary