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Questions and Answers
Quality of Service (QoS) is associated with IP QoS, type of service (ToS), and Frame Relay committed information rate (CIR).
True
Differentiated services (DiffServ) is a type of QoS that supports traffic flows on an individual, end-to-end basis.
False
Service-Level Agreements (SLA) are a type of performance mechanism used to prioritize traffic.
False
Resource Control (RC) is used to change the network from a cost center to profitability.
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Policies are a subset of Quality of Service (QoS) mechanisms.
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Performance Architecture is used to merge multiple traffic types over a common network infrastructure.
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Integrated services (IntServ) aggregates traffic flows on a per-hop basis.
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Quality of Service (QoS) is used to improve the overall performance of a network.
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Performance Architecture is used to differentiate customers for multiple levels of service.
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SLA is used to measure the temporal characteristics of traffic flows.
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Study Notes
Performance Architecture
- Describes how user, application, device, and network requirements for performance (capacity, delay, and RMA) will be met within the planned network.
Objectives
- Learn what performance means in a network, including descriptions of mechanisms to achieve performance.
- Determine the relationships among performance mechanisms and between performance and other architectural components.
- Develop the performance architecture and set goals for performance.
Background
- Performance is the set of levels for capacity, delay, and RMA in a network.
- Desirable to optimize these levels for one or more sets of traffic flows, based on groups of users, applications, and/or devices.
- Performance architecture includes mechanisms to configure, operate, manage, provision, and account for resources in the network that support traffic flows.
Importance of Performance Architecture
- Determine the performance goals of a network.
- Improve overall network performance (e.g., response times and throughput).
- Support particular groups of users or applications.
- Control resource allocation for accounting, billing, and/or management purposes.
Components of Performance
- Controlling traffic inputs to the network (admission and rate controls).
- Adjusting the baseline performance of the network (traffic or capacity engineering).
- Controlling all or part of the network for delivery of specific services (prioritizing, scheduling, and conditioning traffic flows).
- Implementing a feedback loop to users, applications, devices, and management to modify controls as necessary.
Developing Goals for Performance
- Determine if performance mechanisms are necessary for the network.
- Identify the problems to be solved or goals to be achieved by adding performance mechanisms.
- Ensure that performance mechanisms are sufficient for the network.
- Start with simple implementations and work towards more complex architectures.
Performance Mechanisms
- Quality of Service (QoS).
- Resource Control (RC) (prioritization, traffic management, scheduling, and queuing).
- Service-Level Agreements (SLA).
- Policies.
- These mechanisms provide the means to identify traffic flow types, measure their temporal characteristics, and take various actions to improve performance.
Quality of Service (QoS)
- Determining, setting, and acting upon priority levels for traffic flows.
- Associated with IP QoS (including MPLS), type of service (ToS), and Frame Relay committed information rate (CIR).
- Two standard types of QoS:
- Differentiated services (DiffServ, or DS): aggregating traffic flows on a per-hop basis based on traffic behavior.
- Integrated services (IntServ, or IS): supporting traffic flows on an individual, end-to-end basis.
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Description
Learn about network performance architecture, including mechanisms to achieve performance and setting goals for performance. This quiz covers performance requirements, capacity, delay, and reliability.
