CCNA Discovery 4 - Chapter 5

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CCNA Discovery 4 - Chapter 5

  1. 1. Creating the Network Design Designing and Supporting Computer Networks – Chapter 5Version 4.0 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 1
  2. 2. Objectives Analyze business goals and application requirements to determine what factors affect the network design Utilize the hierarchical design model to develop a cost-effective network design that matches the organization’s requirements Select the appropriate WAN connectivity option to meet the organization’s requirements Incorporate wireless connectivity into the LAN design, based on the results of the wireless survey Incorporate security into the LAN/WAN design, including placement of firewalls, IDS, and ACLs © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 2
  3. 3. Analyze Business Goals and Application Requirements List business goals that must be met by the new design Decide which design elements must be present in the final design Explore alternatives to constraints Make trade-offs © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 3
  4. 4. Analyze Business Goals and Application RequirementsStrategies for scalability: Access Layer modules Expandable, modular equipment Broadcast limitation Multiple links Localized VLANs © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 4
  5. 5. Analyze Business Goals and Application RequirementsAvailability requirements: Affordable implementation, maximum protection from failure Availability for e-commerce Security monitoring system IP telephone system © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 5
  6. 6. Analyze Business Goals and Application RequirementsPerformance requirements: Transaction-processing Video distribution and monitoring IP telephone voice quality © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 6
  7. 7. Analyze Business Goals and Application RequirementsSecurity requirements: Use of firewalls VPNs Intrusion prevention systems Endpoint security © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 7
  8. 8. Analyze Business Goals and Application RequirementsDesign trade-offs: Accommodate business goals Eliminate or complicate other improvements © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 8
  9. 9. Utilize the Hierarchical Design Model to Develop a Cost-Effective Network DesignAccess Layer requirements: Connectivity for existing devices and new devices VLANs to separate voice, security, wireless, and normal data services Redundancy QoS © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 9
  10. 10. Utilize the Hierarchical Design Model to Develop a Cost-Effective Network Design Capabilities of existing technology Limitations of existing equipment Power requirements © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 10
  11. 11. Utilize the Hierarchical Design Model to Develop a Cost-Effective Network DesignDistribution layer requirements: Redundant components and links High-density routing Traffic filtering QoS implementation High-bandwidth connectivity Fast convergence Route summarization © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 11
  12. 12. Utilize the Hierarchical Design Model to Develop a Cost-Effective Network DesignCore Layer requirements: High-speed connectivity Routed interconnections High-speed redundant links © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 12
  13. 13. Utilize the Hierarchical Design Model to Develop a Cost-Effective Network Design Create the logical LAN diagram, including the locations of servers and services © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 13
  14. 14. Select the Appropriate WAN Connectivity Option Determine WAN services needed for remote sites © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 14
  15. 15. Select the Appropriate WAN Connectivity Option Select the appropriate WAN connectivity method and identify the equipment required to support it © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 15
  16. 16. Select the Appropriate WAN Connectivity Option Backing up the Frame Relay link Supporting remote workers © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 16
  17. 17. Select the Appropriate WAN Connectivity Option Evaluate IP addressing and routing methodologies for WAN traffic based on company requirements © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 17
  18. 18. Incorporate Wireless Connectivity into the LAN Design Identify the appropriate wireless equipment and capabilities to meet specific design requirements © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 18
  19. 19. Incorporate Wireless Connectivity into the LAN DesignIntegrating wired and wireless solutions: Lightweight Access Points (LAPs) Wireless LAN controllers © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 19
  20. 20. Incorporate Wireless Connectivity into the LAN DesignFactors influencing availability in a wireless network: Location of the AP Signal strength of the AP Number of users Dynamic reconfiguration Centralization © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 20
  21. 21. Incorporate Wireless Connectivity into the LAN DesignCreate an IP address scheme for a wireless LAN: Layer 3 roaming © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 21
  22. 22. Incorporate Security into the LAN/WAN Design Determine the source and nature of potential threats Draw a diagram of the placement of security functions and filters © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 22
  23. 23. Incorporate Security into the LAN/WAN DesignPrimary categories of security services: Infrastructure protection Secure connectivity Threat detection, defense, and mitigation © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 23
  24. 24. Incorporate Security into the LAN/WAN DesignDesign and implement the appropriate access filters to meet a specific network security requirement: Firewall rule sets Access control lists © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 24
  25. 25. Incorporate Security into the LAN/WAN DesignInclude access control lists and firewall rules in the design documentation: Provide evidence that the security policy is implemented Ensure that when changes are made, existing rules are known Assist in troubleshooting © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 25
  26. 26. Summary For each business goal, the designer determines what network changes are necessary. Converged networks carry a combination of data, voice, and video traffic. Designing WAN connectivity requires evaluation of the telecommunications services available in the customer’s area. Unified wireless network solutions offer advanced features. The network designer must identify which data is at risk and what the potential sources of attacks are. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 26
  27. 27. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 27

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