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NetworkTroubleshooting

Accessing the WAN Chapter 8

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Objectives

Establish a network baseline

Describe troubleshooting methodologies andtroubleshooting tools

Describe the common issues that occur during WANimplementation

Troubleshoot enterprise network implementationissues

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Establish a Network Baseline

Explain the importance of network documentation

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Establish a Network Baseline

Describe the stages of the network documentationprocess

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Establish a Network Baseline

Explain the purpose for measuring normal networkperformance when creating a baseline

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Establish a Network Baseline

Describe the steps for establishing a network baseline

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Describe Troubleshooting Methodologiesand Troubleshooting Tools

Explain why a systematic method is the generally thebest approach to troubleshooting

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Describe Troubleshooting Methodologiesand Troubleshooting Tools

Describe how layered models, such as the OSIreference model or TCP/IP model, are used fortroubleshooting

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Describe Troubleshooting Methodologiesand Troubleshooting Tools

Describe the three stages of the generaltroubleshooting process

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Describe Troubleshooting Methodologiesand Troubleshooting Tools

Describe the three main methods for troubleshootingnetwork problems

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Describe Troubleshooting Methodologiesand Troubleshooting Tools

Describe the stages for gathering symptoms fortroubleshooting a network problem

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Describe Troubleshooting Methodologiesand Troubleshooting Tools

Describe the types of software and hardware tools thatare commonly used when troubleshooting networks

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Describe the Common Issues that OccurDuring WAN Implementation

Describe the fundamentals in WAN design andcommunication

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Describe the Common Issues that OccurDuring WAN Implementation

Describe the steps for designing or modifying a WAN

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Describe the Common Issues that OccurDuring WAN Implementation

Describe the considerations for analyzing WAN traffic

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Describe the Common Issues that OccurDuring WAN Implementation

Describe the considerations for designing a WANtopology

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Describe the Common Issues that OccurDuring WAN Implementation

Describe common WAN implementation issues

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Describe the Common Issues that OccurDuring WAN Implementation

Describe the recommended steps for troubleshooting aWAN

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Troubleshoot Enterprise NetworkImplementation Issues

Explain how network diagrams are used fortroubleshooting

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Troubleshoot Enterprise NetworkImplementation Issues

Describe how to troubleshoot network problemsoccurring at the physical layer

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Troubleshoot Enterprise NetworkImplementation Issues

Describe how to troubleshoot network problemsoccurring at the data link layer

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Troubleshoot Enterprise NetworkImplementation Issues

Describe how to troubleshoot network problemsoccurring at the network layer

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Troubleshoot Enterprise NetworkImplementation Issues

Describe how to troubleshoot network problemsoccurring at the transport layer

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Troubleshoot Enterprise NetworkImplementation Issues

Describe how to troubleshoot network problemsoccurring in the application layers

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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 1st baseline

Determine what type of data to collect Identify devices and ports of interest

Determine baseline duration

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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

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Summary

Software troubleshooting tools

Cisco view

Solar winds

HP Open view

Hardware troubleshooting tools

Network analysis mode

Digital multi-meters

Cable testers

Network analyzer

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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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