New Skills

New Training: Describe Quality Problems

by Team Nuggets
New Training: Explain Multicast Routing picture: A
Published on April 28, 2021

In this 6-video skill, CBT Nuggets trainer Jeff Kish covers the beginning of CLCOR Domain 5, which starts with describing the quality problems that drive a need for Quality of Service (QoS) in modern networks. Watch this new Cisco training.

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This training includes:

  • 6 videos

  • 56 minutes of training

You’ll learn these topics in this skill:

  • Intro

  • The Need for QoS

  • The IntServ Model

  • The DiffServ Model

  • Quality Problems

  • Review and Quiz

A Brief Introduction To The IntServ QoS Model

Implementing QoS rules in a business network is all but a requirement today. Organizations need to ensure things like voice or video communications have enough network bandwidth to work properly. Simply implementing QoS rules isn't that easy, though. Network engineers need to understand how QoS works and which type of QoS model to implement. There are three types of QoS models, and we are going to briefly discuss the IntServe model here.

IntServe stands for Integrated Services. This is known as a hard QoS model. Unlike the Best Effort and DifServe models, the IntServe model is entirely dependent on network flows. This has both pros and cons.

With the IntServe model, before network traffic flows through the network, it must request network resources first. That's because the network needs to verify that it has the capacity to reserve to meet the QoS request through the entire network flow. As such, the entire network must be IntServe aware for this model to work properly.

Though this can ensure network traffic flows smoothly, it also uses far more resources. Additional computation time and resources are needed at each node to process and reserve that flow request. The IntServe model is also the hardest of the 3 QoS models to implement.

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