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Chapter 4
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.
© 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.
© 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.
© 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.
© 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.
© 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.
© 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.
© 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.
© 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.
© 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.
© 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.
© 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.
© 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.
© 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.
© 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.
© 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.
© 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.
© 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.
© 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.
© 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.
© 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.
© 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.
© 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.
© 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.
© 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.
© 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.
© 2006 Cisco
Systems, Inc. All rights reserved. Cisco Public 27
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