Quality of ServiceQuality of ServiceCCDA Quick Reference

QoS MechanismsQoS Mechanisms

Bandwidth ProvisionBandwidth ProvisionCall Admission Control – provision applications

to a certain bandwidth or resource limit so they do not negatively affect other applications.

Signaling TechniquesSignaling TechniquesThe 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.

Classification and MarkingClassification 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

Congestion AvoidanceCongestion AvoidanceCongestion-Avoidance techniques monitor

network traffic loads so that congestion can be anticipated and avoided before it becomes problematic.

Traffic Policing and Traffic Policing and ShapingShaping

Congestion ManagementCongestion Management

Scheduling – decides from which queue traffic is to be sent next.

Link EfficiencyLink Efficiency Link Efficiency reduces unacceptable delays on low-

speed links with Link-Fragmentation and Interleaving and Compression schemes

Layered QoS ModelLayered QoS Model

Citation for this picture is provided in the next slide

CitationsCitationsTeare, 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