© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE I Chapter 6 1 Network Troubleshooting Accessing the WAN – Chapter 8

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 2 Objectives  Establish a network baseline  Describe troubleshooting methodologies and troubleshooting tools  Describe the common issues that occur during WAN implementation  Troubleshoot enterprise network implementation issues

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 3 Establish a Network Baseline

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© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 28 Summary  Network Baseline How a network is expected to perform under normal conditions  Network documentation should include: –Network configuration table –End-system configuration table –Network topology diagram  Planning for the 1 st baseline –Determine what type of data to collect –Identify devices and ports of interest –Determine baseline duration

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 29 Summary  3 stages of the troubleshooting process –Gather symptoms –Isolate problem –Correct problem  3 main methods for troubleshooting a network –Bottom up –Top down –Divide & conquer

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 30 Summary  Software troubleshooting tools –Cisco view –Solar winds –HP Open view  Hardware troubleshooting tools –Network analysis mode –Digital multi-meters –Cable testers –Network analyzer

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 31 Summary  Common WAN implementation issues include –QoS –Reliability –Security –Latency –Confidentiality –Public or Private  Using a layered approach to troubleshooting aids in isolating and solving the problem

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