CCNA Discovery 4 - Chapter 1

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CCNA Discovery 4 - Chapter 1

  1. 1. Introducing Network Design Concepts Designing and Supporting Computer Networks – Chapter 1Version 4.0 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 1
  2. 2. Objectives Explain how a hierarchical network design creates a stable, reliable, scalable network Explain what factors need to be considered when the Core Layer of a network is designed and implemented Explain which factors need to be considered when the Distribution Layer of a network is designed and implemented Explain which factors need to be considered when the Access Layer of a network is designed and implemented Describe the benefits and security implications of creating server farms Describe the considerations of an implementation of a wireless network design Describe the factors that affect the implementation of VPNs, including how remote workers can be supported © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 2
  3. 3. Explain How a Hierarchical Network Design Creates a Stable, Reliable, Scalable NetworkNetwork requirements: Ease of management Fast recovery Application response time Fast troubleshooting © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 3
  4. 4. Explain How a Hierarchical Network Design Creates a Stable, Reliable, Scalable NetworkFour fundamental network design goals: Scalability Availability Security Manageability © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 4
  5. 5. Explain How a Hierarchical Network DesignCreates a Stable, Reliable, Scalable Network Core Layer: connects Distribution Layer devices Distribution Layer: interconnects smaller LANs Access Layer: provides connections for hosts and end devices © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 5
  6. 6. Explain How a Hierarchical Network DesignCreates a Stable, Reliable, Scalable NetworkSubdividing the three-layer model into modular areas: Enterprise campus Server farm Enterprise edge © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 6
  7. 7. Explain How a Hierarchical Network Design Creates a Stable, Reliable, Scalable NetworkSteps in network design projects: Identify the network requirements Characterize the existing network Design the network topology and solutions © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 7
  8. 8. Explain what Factors Need to be Considered when Designing the Network Core Layer Network backbone Goals of the Core Layer Provide 100% uptime Maximize throughput Facilitate network growth © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 8
  9. 9. Explain what Factors Need to be Considered when Designing the Network Core Layer Combining routing and switching in the same device Redundancy and load balancing High-speed and aggregate links Quick convergence © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 9
  10. 10. Explain what Factors Need to be Considered when Designing the Network Core Layer Full mesh topology Partial mesh topology Failure prevention Reducing human error © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 10
  11. 11. Explain which Factors Need to be Considered when Designing the Distribution Layer of a Network  Filtering and managing traffic flow  Access control policies  Route summarization  Isolating Core Layer from Access Layer failures  Routing between VLANs © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 11
  12. 12. Explain which Factors Need to be Considered when Designing the Distribution Layer of a Network  Explain how redundant links improve network reliability and stability © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 12
  13. 13. Explain which Factors Need to be Considered when Designing the Distribution Layer of a Network  Explain how ACLs filter traffic for security and traffic management © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 13
  14. 14. Explain which Factors Need to be Considered when Designing the Distribution Layer of a Network  Explain the concept of route summarization and describe how it is implemented at the Distribution Layer of the network © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 14
  15. 15. Explain which Factors Need to be Considered when Designing the Access Layer of a Network  Physical location of equipment  Wiring closets  Converged networking  Availability © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 15
  16. 16. Explain which Factors Need to be Consideredwhen Designing the Access Layer of a Network  Naming structures  VLAN architecture  Traffic patterns  Prioritization strategies © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 16
  17. 17. Explain which Factors Need to be Consideredwhen Designing the Access Layer of a Network  Star topologies © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 17
  18. 18. Explain which Factors Need to be Considered when Designing the Access Layer of a Network Functions of VLANs:  Separate and classify traffic  Control broadcasts  Contain VLANs within a single wiring closet © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 18
  19. 19. Explain which Factors Need to be Considered when Designing the Access Layer of a Network QoS at the network edge:  Classification  Assigned priority © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 19
  20. 20. Explain which Factors Need to be Considered when Designing the Access Layer of a Network Security risks at the network edge:  Authentication  Wireless security © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 20
  21. 21. Explain which Factors Need to be Considered when Designing the Access Layer of a Network Security measures at the Access Layer:  Physical security  Strong passwords  SSH  Disabling unused ports  Security policy © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 21
  22. 22. Describe the Benefits and Security Implications of Creating Server Farms  Defined entry and exit points for network traffic  Redundant, high-capacity links  Load balancing and failover  Lower cost of providing services © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 22
  23. 23. Describe the Benefits and Security Implications of Creating Server Farms  Firewalls  LAN switch security features  Intrusion and prevention systems  Load balancers  Network analysis and management devices  DMZs © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 23
  24. 24. Describe the Benefits and Security Implications of Creating Server Farms  Building in redundancy for high availability  Virtualization © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 24
  25. 25. Describe the Considerations of an Implementation of a Wireless Network Design Customer requirements:  Roaming  Authentication  Services and applications  Encryption  Coverage and number of users © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 25
  26. 26. Describe the Considerations of an Implementation of a Wireless Network Design  Physical WLAN design  Site survey  Logical WLAN design  Open guest access vs. secured employee access © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 26
  27. 27. Describe the Factors that Affect the Implementation of VPNs  Cost of bandwidth  QoS  Security  Remote access © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 27
  28. 28. Describe the Factors that Affect the Implementation of VPNs Interconnection options:  Traditional WAN technologies  Newer WAN technologies © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 28
  29. 29. Describe the Factors that Affect the Implementation of VPNs  Explain ways to provide redundant connectivity to remote sites © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 29
  30. 30. Summary The four fundamental technical requirements of network design are scalability, availability, security and manageability. Network projects involve identifying the requirements, characterizing the existing network, and designing the network topology and solutions. Redundancy at the Core Layer keeps the network functioning even when a device or link fails. Routing efficiency at the Distribution Layer isolates the Core from Access Layer failures. Using VLANs and IP subnets is the most common way to segregate user groups and traffic within the Access Layer. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 30
  31. 31. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 31

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