CCNA Discovery 4 - Chapter 4

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CCNA Discovery 4 - Chapter 4

  1. 1. Identifying Application Impacts on Network Design Designing and Supporting Computer Networks – Chapter 4Version 4.0 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 1
  2. 2. Objectives Explain how applications and traffic flow can affect the design of the network Identify application impacts on network design Explain how Quality of Service is implemented on the LAN/WAN Explain the options for supporting voice and video traffic on the network Document the network requirements of specific categories of applications and diagram the application traffic flows through the network © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 2
  3. 3. Explain How Applications and Traffic Flow Can Affect the Network Design Application performance depends on availability and responsiveness Measurement: user satisfaction, throughput, technical metrics © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 3
  4. 4. Explain How Applications and Traffic Flow Can Affect the Network DesignFour main types of application communication: Client-to-client Client-to-distributed server Client-to-server farm Client-to-enterprise edge © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 4
  5. 5. Explain How Applications and Traffic Flow Can Affect the Network DesignCharacterize applications by gathering information: Organizational output Network audit Traffic analysis © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 5
  6. 6. Explain How Applications and Traffic Flow Can Affect the Network Design Internal traffic: identify areas where high bandwidth is needed, and possible bottlenecks External traffic: determine placement of firewalls and DMZ networks © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 6
  7. 7. Explain How Applications and Traffic Flow Can Affect the Network Design Installed hardware affects application performance Choose hardware after analyzing technical requirements © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 7
  8. 8. Identifying Application Impacts on Network DesignTransaction-processing applications: Additional operations required Immediate response to user requests Redundancy and security required © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 8
  9. 9. Identifying Application Impacts on Network DesignReal-time streaming applications: Minimize latency and jitter Infrastructure may need to be upgraded © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 9
  10. 10. Identifying Application Impacts on Network DesignFile transfer and email applications: Unpredictable bandwidth usage Large packet size Centralization of file and mail servers in a secure location Redundancy to ensure reliable service © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 10
  11. 11. Identifying Application Impacts on Network DesignHTTP and web traffic: Network media Redundancy Security © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 11
  12. 12. Identifying Application Impacts on Network DesignMicrosoft Domain Services: Active Directory Services Broadcast generation Tight integration between ADS, DNS, and DHCP © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 12
  13. 13. Explain how Quality of Service is Implemented on the LAN/WAN Capability of a network to provide preferential service to selected network traffic Dedicated bandwidth, controlled jitter and latency, and reduced packet loss © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 13
  14. 14. Explain how Quality of Service is Implemented on the LAN/WANImplementing traffic queues: Identify traffic requirements Define traffic classes Define QoS policies © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 14
  15. 15. Explain how Quality of Service is Implemented on the LAN/WANSet priorities to manage traffic: Queue type Traffic assignment Size Filter traffic into high, medium, normal and low priorities © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 15
  16. 16. Explain how Quality of Service is Implemented on the LAN/WANWhere QoS can be implemented to affect traffic flow: Layer 2 devices Layer 3 devices © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 16
  17. 17. Explain the Options for Supporting Voice and Video Traffic on the NetworkNetwork design implications of converged networking: Strong performance Security features Mandatory use of QoS mechanisms © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 17
  18. 18. Explain the Options for Supporting Voice and Video Traffic on the NetworkNetwork design implications of IP telephony: Power and capacity planning Identifying contending traffic flows Selecting components for the IP telephony solution © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 18
  19. 19. Explain the Options for Supporting Voice and Video Traffic on the NetworkLive video: Video on Demand:• Streaming media files  Either stream or download• User sees content before all before viewing packets have arrived  Users can store content and• No need to store large media view later files before playing them  Unicast packets to a specific• Uses multicast packets to user requesting the service many users at the same time © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 19
  20. 20. Explain the Options for Supporting Voice and Video Traffic on the NetworkSupporting remote workers with voice and video: Assess bandwidth requirements for WAN connection Permanent link or on-demand © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 20
  21. 21. Document the Network Requirements of Specific Categories of Applications Estimate the volume of application traffic during the initial design phase. Document projected applications and associated hardware in a network diagram. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 21
  22. 22. Document the Network Requirements of Specific Categories of Applications Diagram the flow of traffic to and from hosts and servers within the LAN © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 22
  23. 23. Document the Network Requirements of Specific Categories of Applications Diagram the flow of traffic to and from remote sites, including VPN traffic © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 23
  24. 24. Document the Network Requirements of Specific Categories of Applications Diagram outgoing traffic flows destined for the Internet gateway and incoming traffic from the Internet to locally-provided services © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 24
  25. 25. Document the Network Requirements of Specific Categories of Applications Diagram extranet traffic flows to and from selected trusted partners, customers, and vendors © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 25
  26. 26. Summary End users evaluate network performance based on the availability and responsiveness of their applications. The choice of hardware installed on a network can affect the performance of the applications. When adding a new application, the designer must consider the impact on the performance of existing applications. Voice and video applications present unique requirements, as they cannot tolerate delays. Security and reliability are primary concerns in a network supporting high volumes of web traffic. The primary goal of QoS is to provide priority, dedicated bandwidth, controlled jitter and latency, and reduced packet loss. © 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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