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Identifying App Impacts Network Design
- 1. Identifying Application
Impacts on Network
Design
Designing and Supporting Computer Networks – Chapter 4
Version 4.0 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 1
- 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. 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. 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
© 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 4
- 5. Explain How Applications and Traffic
Flow Can Affect the Network Design
Characterize applications by gathering information:
Organizational output
Network audit
Traffic analysis
© 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 5
- 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. 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. Identifying Application Impacts on
Network Design
Transaction-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. Identifying Application Impacts on
Network Design
Real-time streaming applications:
Minimize latency and jitter
Infrastructure may need to be upgraded
© 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 9
- 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
© 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 10
- 11. Identifying Application Impacts on
Network Design
HTTP and web traffic:
Network media
Redundancy
Security
© 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 11
- 12. Identifying Application Impacts on
Network Design
Microsoft 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. 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. Explain how Quality of Service is
Implemented on the LAN/WAN
Implementing traffic queues:
Identify traffic requirements
Define traffic classes
Define QoS policies
© 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 14
- 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
© 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 15
- 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
© 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 16
- 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
© 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 17
- 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
© 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 18
- 19. Explain the Options for Supporting Voice
and Video Traffic on the Network
Live 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. 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
© 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 20
- 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. 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. 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. 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. 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. 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. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 27