Contents at a glance of this book: Chapter 1 Maintenace (Methodology, Common Tasks, Tools). Chapter 2 Troubleshooting Methodology (Principle, Structured Troubleshooting, The troubleshooting Methodes, Integrating Troubleshooting into Maintenance). Chapter 3 Troubleshooting Tools (IOS Filtering Tools, Output Redirection, IOS Troubleshooting Tools, Hardware Diagnostics, Working with External Tools). Chapter 4 Troubleshooting Switches) (Spanning Tree, VLANs, Swiotched Virtual Interfaces and InterVLAN Routing, First-Hop Redundancy). Chapter 5 Troubleshooting Routing (Network Layer Connectivity, Routing Protocols, EIGRP, OSPF, BGP, Router Performance). Chapter 6 (Troubleshooting Security Feature).//yeni