Introduction xx Chapter 1 Fundamentals Review 1 Switching Introduction 2 Hubs and Switches 2 Bridges and Switches 2 Switches of Today 3 Broadcast Domains 3 MAC Addresses 4 The Basic Ethernet Frame Format 4 Basic Switching Function 5 VLANs 6 The Spanning Tree Protocol 6 Trunking 7 Port Channels 7 Multilayer Switching 8 Summary 8 Chapter 2 Network Design Fundamentals 9 Campus Network Structure 9 Hierarchical Network Design 10 Access Layer 12 Distribution Layer 13 Core Layer (Backbone) 14 Layer 3 in the Access Layer 17 The Cisco Enterprise Campus Architecture 19 The Need for a Core Layer 20 Types of Cisco Switches 22 Comparing Layer 2 and Multilayer Switches 24 MAC Address Forwarding 24 Layer 2 Switch Operation 25 Layer 3 (Multilayer) Switch Operation 26 Useful Commands for Viewing and Editing Catalyst Switch MAC Address Tables 27 Frame Rewrite 28 Distributed Hardware Forwarding 28 Cisco Switching Methods 29 Route Caching 30 Topology-Based Switching 31 Hardware Forward Details 33 Study Tips 34 Summary 34 Review Questions 35 Chapter 3 Campus Network Architecture 41 Implementing VLANs and Trunks in Campus Environment 41 VLAN Overview 42 VLAN Segmentation 44 End-to-End VLANs 44 Local VLANs 45 Comparison of End-to-End VLANs and Local VLANs 46