Overview

This lesson provides information regarding the application of quality of service (QoS) mechanisms throughout a simple network. The lesson follows two packets—a high-priority voice packet and a low-priority file transfer packet—as they traverse a QoS-enabled network.

Objectives

Upon completing this lesson, you will be able to describe how QoS mechanisms have an impact on IP packets. This ability includes being able to meet these objectives:

■ Describe how QoS mechanisms have an impact on IP packets

■ On a network diagram, identify key points where the QoS status of a high-priority (VoIP) packet can be altered as QoS policies are applied to the IP packet

■ On a network diagram, identify key points where the QoS status of a low-priority (FTP) packet can be altered as QoS policies are applied to the IP packet

QoS and Packets

The first packet, packet 1, is a high-priority VoIP packet that will receive preferential treatment as it moves through the network.

The second packet, packet 2, is a low-priority FTP packet that will receive deferential treatment as it moves through the network.

A QoS peering relation between the enterprise and the service provider is assumed. The service provider will recognize and act upon QoS classifications made by the enterprise customer. The relationship shows how QoS can be effectively honored across an enterprise and service provider boundary.

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