Network Quality of Service (QoS) Foundations: Managing Network Traffic

Network Quality of Service (QoS) Foundations: Managing Network Traffic

2h 28mIntermediate2025-01-14

Authors

Arash Deljoo

Arash Deljoo

Course details

Quality of Service (QoS) is the key to ensuring critical applications perform seamlessly, even in the face of network congestion. In this vendor-neutral course, instructor Arash Deljoo guides you through the core concepts and practical importance of QoS in optimizing network performance across any platform.
Explore essential network parameters, delve into classification and marking techniques, and master the principles of congestion management and avoidance. You’ll also gain insights into traffic conditioning and link efficiency, learning how to ensure reliable and consistent service across diverse networks.

Designed for network engineers, system administrators, IT managers, and telecommunications professionals, this course equips you with real-world QoS skills and case studies. By the end, you’ll be ready to implement these foundational techniques and take the next step in mastering QoS in advanced scenarios covered in the next course.

Learning objectives
Define Quality of Service (QoS) and its key network parameters.
Explain classification and marking.
Manage network congestion.
Identify and apply congestion avoidance techniques.
Explain traffic conditioning.
Use link efficiency tools in your organization.
Consider how business-critical QoS case studies can be applied to meet your organization's network needs.

Skills covered

Software AdministrationServer AdministrationFoundationsNetwork AdministrationNetwork and System Administration

Concepts

Introduction

  • Intro to network QoS

QoS Overview

  • The need for QoS
  • Bandwidth
  • Delay
  • Jitter
  • Packet loss
  • QoS models

Classification and Marking

  • The need for classification and marking
  • IP header marking field - IP precedence
  • IP header marking field - IP DSCP
  • Ethernet header QoS field - Class of Service (CoS)
  • Other marking fields
  • Classification and marking best practices

Congestion Management

  • Router queuing
  • Software queues and hardware queues
  • FIFO queuing
  • Priority queuing (PQ)
  • Custom queuing (CQ)
  • Modified deficit round-robin (MDRR)
  • Weighted fair queuing (WFQ)
  • Class-based WFQ (CBWFQ)
  • Low latency queuing (LLQ)
  • Congestion management best practices

Traffic Policing and Shaping

  • Traffic policing and traffic shaping concepts
  • When and where to use shaping and policing
  • How shaping works
  • Traffic shaping with no excess burst
  • Traffic shaping with excess burst
  • Traffic-shaping adaptation
  • Queuing and traffic shaping
  • How policing works
  • Policing - single-rate, two-color (1 bucket)
  • Policing - dual token bucket (single-rate)
  • Policing - dual token bucket (dual rate)
  • Policing best practices

Congestion Avoidance

  • TCP and UDP reactions to packet loss
  • Tail drop, global synchronization, and TCP starvation
  • Random early detection (RED)
  • Weighted RED (WRED)
  • WRED and queuing
  • Explicit congestion notification

Link Efficiency Tools

  • Payload and header compression
  • Link fragmentation and interleaving

QoS Case Studies

  • Enterprise campus QoS implementations
  • Enterprise to service provider WAN QoS
  • Service provider to enterprise WAN QoS
  • Service provider backbone QoS

Conclusion

  • Next steps
80,000 Toman