Quality of Service

1
Quality of Service

• CCDA Quick Reference

2
QoS Mechanisms
3
Bandwidth Provision

• Call Admission Control provision applications
  to a certain bandwidth or resource limit so they
  do not negatively affect other applications.

4
Signaling Techniques

• The Resource Reservation Protocol (RSVP) allows
  bandwidth and other resources along the routing
  path to be reserved so that a certain level of
  quality is provided for delay-sensitive traffic.

5
Classification and Marking

• Classification is the process of partitioning
  traffic into multiple priority levels or classes
  of service.
• Marking is the process of changing the priority
  of class of service setting within a frame or
  packet to indicate its classification

6
Congestion Avoidance

• Congestion-Avoidance techniques monitor network
  traffic loads so that congestion can be
  anticipated and avoided before it becomes
  problematic.

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Traffic Policing and Shaping
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Congestion Management
Scheduling decides from which queue traffic is
to be sent next.
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Link Efficiency

• Link Efficiency reduces unacceptable delays on
  low-speed links with Link-Fragmentation and
  Interleaving and Compression schemes

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Layered QoS Model
Citation for this picture is provided in the next
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Citations

• Teare, Diane, 2008. Authorized Self-Study Guide
  Designing for Cisco Internetwork Solutions
  (DESIGN), Second Edition. 800 East 96th Street,
  Indianapolis, Indiana 46240 USA Cisco Press
• Cisco Systems, Inc