© 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 1Version 4.0
Identifying Application
Impacts on Network
Desig...
© 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 2
Objectives
 Explain how applications and traffic flow can ...
© 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 3
Explain How Applications and Traffic
Flow Can Affect the Ne...
© 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 4
Explain How Applications and Traffic
Flow Can Affect the Ne...
© 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 5
Characterize applications by gathering information:
 Organ...
© 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 6
Explain How Applications and Traffic
Flow Can Affect the Ne...
© 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 7
Explain How Applications and Traffic
Flow Can Affect the Ne...
© 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 8
Identifying Application Impacts on
Network Design
Transacti...
© 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 9
Identifying Application Impacts on
Network Design
Real-time...
© 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 10
Identifying Application Impacts on
Network Design
File tra...
© 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 11
Identifying Application Impacts on
Network Design
HTTP and...
© 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 12
Identifying Application Impacts on
Network Design
Microsof...
© 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 13
Explain how Quality of Service is
Implemented on the LAN/W...
© 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 14
Explain how Quality of Service is
Implemented on the LAN/W...
© 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 15
Explain how Quality of Service is
Implemented on the LAN/W...
© 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 16
Explain how Quality of Service is
Implemented on the LAN/W...
© 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 17
Explain the Options for Supporting Voice
and Video Traffic...
© 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 18
Explain the Options for Supporting Voice
and Video Traffic...
© 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 19
Explain the Options for Supporting Voice
and Video Traffic...
© 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 20
Explain the Options for Supporting Voice
and Video Traffic...
© 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 21
Document the Network Requirements of
Specific Categories o...
© 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 22
Document the Network Requirements of
Specific Categories o...
© 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 23
Document the Network Requirements of
Specific Categories o...
© 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 24
Document the Network Requirements of
Specific Categories o...
© 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 25
Document the Network Requirements of
Specific Categories o...
© 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 26
Summary
 End users evaluate network performance based on ...
© 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 27
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Chapter 4

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Chapter 4

  1. 1. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 1Version 4.0 Identifying Application Impacts on Network Design Designing and Supporting Computer Networks – Chapter 4
  2. 2. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 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
  3. 3. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 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
  4. 4. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 4 Explain How Applications and Traffic Flow Can Affect the Network Design Four main types of application communication:  Client-to-client  Client-to-distributed server  Client-to-server farm  Client-to-enterprise edge
  5. 5. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 5 Characterize applications by gathering information:  Organizational output  Network audit  Traffic analysis Explain How Applications and Traffic Flow Can Affect the Network Design
  6. 6. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 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
  7. 7. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 7 Explain How Applications and Traffic Flow Can Affect the Network Design  Installed hardware affects application performance  Choose hardware after analyzing technical requirements
  8. 8. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 8 Identifying Application Impacts on Network Design Transaction-processing applications:  Additional operations required  Immediate response to user requests  Redundancy and security required
  9. 9. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 9 Identifying Application Impacts on Network Design Real-time streaming applications:  Minimize latency and jitter  Infrastructure may need to be upgraded
  10. 10. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 10 Identifying Application Impacts on Network Design File 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
  11. 11. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 11 Identifying Application Impacts on Network Design HTTP and web traffic:  Network media  Redundancy  Security
  12. 12. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 12 Identifying Application Impacts on Network Design Microsoft Domain Services:  Active Directory Services  Broadcast generation  Tight integration between ADS, DNS, and DHCP
  13. 13. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 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
  14. 14. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 14 Explain how Quality of Service is Implemented on the LAN/WAN Implementing traffic queues:  Identify traffic requirements  Define traffic classes  Define QoS policies
  15. 15. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 15 Explain how Quality of Service is Implemented on the LAN/WAN Set priorities to manage traffic:  Queue type  Traffic assignment  Size  Filter traffic into high, medium, normal and low priorities
  16. 16. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 16 Explain how Quality of Service is Implemented on the LAN/WAN Where QoS can be implemented to affect traffic flow:  Layer 2 devices  Layer 3 devices
  17. 17. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 17 Explain the Options for Supporting Voice and Video Traffic on the Network Network design implications of converged networking:  Strong performance  Security features  Mandatory use of QoS mechanisms
  18. 18. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 18 Explain the Options for Supporting Voice and Video Traffic on the Network Network design implications of IP telephony:  Power and capacity planning  Identifying contending traffic flows  Selecting components for the IP telephony solution
  19. 19. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 19 Explain the Options for Supporting Voice and Video Traffic on the Network Live video: • Streaming media files • User sees content before all packets have arrived • No need to store large media files before playing them • Uses multicast packets to many users at the same time Video on Demand:  Either stream or download before viewing  Users can store content and view later  Unicast packets to a specific user requesting the service
  20. 20. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 20 Explain the Options for Supporting Voice and Video Traffic on the Network Supporting remote workers with voice and video:  Assess bandwidth requirements for WAN connection  Permanent link or on-demand
  21. 21. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 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.
  22. 22. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 22 Document the Network Requirements of Specific Categories of Applications  Diagram the flow of traffic to and from hosts and servers within the LAN
  23. 23. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 23 Document the Network Requirements of Specific Categories of Applications  Diagram the flow of traffic to and from remote sites, including VPN traffic
  24. 24. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 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
  25. 25. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 25 Document the Network Requirements of Specific Categories of Applications  Diagram extranet traffic flows to and from selected trusted partners, customers, and vendors
  26. 26. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 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.
  27. 27. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 27
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