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CCNA Discovery 4 - Chapter 3
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CCNA Discovery 4 - Chapter 3

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  • 1. Characterizing the Existing Network Designing and Supporting Computer Networks – Chapter 3Version 4.0 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 1
  • 2. Objectives Diagram and document an existing network to identify strengths and weaknesses in the design. Use CCO to determine the appropriate IOS version to support network requirements and download and install the appropriate IOS Use CCO to determine the appropriate hardware features and install the upgrades using safe practices and procedures Perform a wireless site survey Organize collected data into a new network design © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 2
  • 3. Diagram a Physical Network and Document the Existing NetworkNetwork documentation: Logical and physical diagrams Floor plans Inventory lists for equipment and applications Current network configuration files © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 3
  • 4. Diagram a Physical Network and Document theExisting Network Log in to network devices Use Cisco IOS software commands to gain information on routers and switches © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 4
  • 5. Diagram a Physical Network and Document the Existing Network Create a logical network diagram showing existing addressing, routing, and network segmentation Illustrate how information flows through the network © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 5
  • 6. Diagram a Physical Network and Document the Existing Network Create a modular block diagram Simplify the network to show major functions © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 6
  • 7. Diagram a Physical Network and Document the Existing Network Identify and document the strengths and weaknesses of the existing network Focus on finding ways to overcome weaknesses © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 7
  • 8. Use CCO to Determine the Appropriate IOS Version to Support Network RequirementsCisco CCO features and navigation: Documentation Tools Downloads Communities and training News © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 8
  • 9. Use CCO to Determine the Appropriate IOS Version to Support Network Requirements Use the show version command Verify that the inventory list is correct Obtain missing information © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 9
  • 10. Use CCO to Determine the Appropriate IOS Version to Support Network Requirements Select the correct IOS image using the CCO IOS Feature Navigator © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 10
  • 11. Use CCO to Determine the Appropriate IOS Version to Support Network Requirements Download the correct IOS Store new IOS image on TFTP server Transfer the file to the Cisco router or switch © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 11
  • 12. Use CCO to Determine the Appropriate IOS Version to Support Network RequirementsThree stages of the router bootup process: Perform the POST and load the bootstrap program Locate and load the IOS software Locate and execute the startup configuration, or enter setup mode © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 12
  • 13. Use CCO to Determine the Appropriate Hardware Features and Install the Upgrades Use datasheets to see what modules and interfaces are available Determine the technologies and media a given device will support © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 13
  • 14. Use CCO to Determine the Appropriate Hardware Features and Install the UpgradesInstalling a new hardware option on a Cisco router or switch: Turn off power Remove blank faceplace Install option module Turn on power and check the new configuration © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 14
  • 15. Perform a Wireless Site Survey Preparation Site survey Security Safety guidelines © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 15
  • 16. Perform a Wireless Site Survey Identify possible sources of signal interference Identify physical infrastructure issues © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 16
  • 17. Perform a Wireless Site Survey Define customer requirements Identify coverage areas Determine preliminary access point locations Measure signal strength © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 17
  • 18. Organize Collected Data into a New Network DesignDesign requirements document: Overall project goal Project scope Network requirements Current state of the network © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 18
  • 19. Organize Collected Data into a New Network Design Identify and record the overall goal of the proposed network design © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 19
  • 20. Organize Collected Data into a New Network Design Identify and record the scope of the proposed network upgrade © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 20
  • 21. Organize Collected Data into a New Network Design Identify and record the business goals and technical requirements of the proposed network design © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 21
  • 22. Organize Collected Data into a New Network Design Characterize the existing network in relation to the identified business goals and technical requirements © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 22
  • 23. Summary Ensure that network documentation is accurate and complete before designing an upgrade Gather information using tools like Cisco Network Assistant Organize the current network into a modular block diagram to identify where the network needs to be improved. The Cisco CCO site provides valuable tools and documentation for the design process. Before producing a wireless network design, it is usually necessary to do a wireless site survey. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 23
  • 24. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 24