network troubleshooting
TRANSCRIPT
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© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE I Chapter 6 1
Network Troubleshooting
Accessing the WAN – Chapter 8
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© 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
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© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 3
Establish a Network Baseline Explain the importance of network documentation
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© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 4
Establish a Network Baseline Describe the stages of the network documentation
process
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© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 5
Establish a Network Baseline Explain the purpose for measuring normal network
performance when creating a baseline
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© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 6
Establish a Network Baseline Describe the steps for establishing a network baseline
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© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 7
Describe Troubleshooting Methodologies and Troubleshooting Tools Explain why a systematic method is the generally the
best approach to troubleshooting
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© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 8
Describe Troubleshooting Methodologies and Troubleshooting Tools Describe how layered models, such as the OSI
reference model or TCP/IP model, are used for troubleshooting
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© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 9
Describe Troubleshooting Methodologies and Troubleshooting Tools Describe the three stages of the general
troubleshooting process
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© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 10
Describe Troubleshooting Methodologies and Troubleshooting Tools Describe the three main methods for troubleshooting
network problems
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© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 11
Describe Troubleshooting Methodologies and Troubleshooting Tools Describe the stages for gathering symptoms for
troubleshooting a network problem
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© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 12
Describe Troubleshooting Methodologies and Troubleshooting Tools Describe the types of software and hardware tools that
are commonly used when troubleshooting networks
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© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 13
Describe the Common Issues that Occur During WAN Implementation Describe the fundamentals in WAN design and
communication
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© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 14
Describe the Common Issues that Occur During WAN Implementation Describe the steps for designing or modifying a WAN
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© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 15
Describe the Common Issues that Occur During WAN Implementation Describe the considerations for analyzing WAN traffic
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© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 16
Describe the Common Issues that Occur During WAN Implementation Describe the considerations for designing a WAN
topology
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© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 17
Describe the Common Issues that Occur During WAN Implementation Describe common WAN implementation issues
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© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 18
Describe the Common Issues that Occur During WAN Implementation Describe the recommended steps for troubleshooting a
WAN
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© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 19
Troubleshoot Enterprise Network Implementation Issues Explain how network diagrams are used for
troubleshooting
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© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 20
Troubleshoot Enterprise Network Implementation Issues Describe how to troubleshoot network problems
occurring at the physical layer
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© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 21
Troubleshoot Enterprise Network Implementation Issues Describe how to troubleshoot network problems
occurring at the data link layer
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© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 22
Troubleshoot Enterprise Network Implementation Issues Describe how to troubleshoot network problems
occurring at the network layer
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© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 23
Troubleshoot Enterprise Network Implementation Issues Describe how to troubleshoot network problems
occurring at the transport layer
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© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 24
Troubleshoot Enterprise Network Implementation Issues Describe how to troubleshoot network problems
occurring in the application layers
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© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 25
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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© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 26
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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© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 27
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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© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 28
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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© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 29