Cisco Support Exam Certification Guide focuses on review of the concepts involved in diagnosing, isolating, and correcting network problems. Review and practice thoroughly cover five major areas, including 1. Troubleshooting resources, tools, and methodology, 2. Understanding Data-Link Layer troubleshooting, fast switching methods, and buffering technologies, 3. Network Layer protocol troubleshooting, 4. Troubleshooting Catalyst 5000 switches, and 5. Troubleshooting WAN connections. Chapter opening quizzes enable you to evaluate your knowledge of chapter topics and decide how much study you need in each chapter. Foundation summary sections concisely outline major concepts for quick reference. Scenario based exercises and chapter ending review questions reinforce retention and recall of exam topics. Finally, over 200 additional practice questions on the companion CD enables you to build and take random sample tests.