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Junos Class of Service (JCOS) Course Overview

Junos Class of Service (JCOS) Course Overview

The Junos Class of Service (JCOS) course is designed to provide network professionals with a deep understanding of the Class of Service (CoS) mechanisms available in Junos OS used in Juniper Networks routers. The course focuses on the intricate details of CoS concepts, including their history, evolution, and how they are integrated into modern networks leveraging Differentiated Services (DiffServ). It covers the specifics of packet classification, policing, scheduling, hierarchical scheduling, and rewrite rules, each of which is crucial for implementing effective Quality of Service (QoS) policies.

Participants will delve into practical labs where they configure packet classification, policers, schedulers, and hierarchical schedulers. They'll also learn to set up rewrite rules and CoS-based forwarding (CBF) to ensure traffic is treated appropriately based on organizational requirements. The course culminates in a case study that reinforces the skills learned, with a focus on implementing CoS in a Voice over IP (VoIP) scenario. By the end of the JCOS course, learners will be equipped with valuable knowledge and hands-on experience to optimize network performance and reliability through advanced CoS configurations.

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Course Prerequisites

Certainly! For individuals interested in successfully undertaking the Junos Class of Service (JCOS) course, the following minimum prerequisites are recommended:


  • Basic understanding of networking concepts and terminology.
  • Familiarity with the Juniper Networks Junos operating system, including navigating its command line interface (CLI).
  • Prior experience with or knowledge of Junos routing and switching, equivalent to having attended the Introduction to the Junos Operating System (IJOS) and Junos Routing Essentials (JRE) courses.
  • An understanding of the fundamentals of traffic engineering and quality of service (QoS) mechanisms.

These prerequisites are designed to ensure that learners have a foundational knowledge base that will allow them to engage effectively with the course material and gain the maximum benefit from the training.


Target Audience for Junos Class of Service (JCOS)

The Junos Class of Service (JCOS) course is designed for network professionals who manage and optimize Juniper Networks infrastructure.


Target audience for the Junos Class of Service (JCOS) course includes:


  • Network Engineers and Specialists
  • Network Administrators
  • Network Architects
  • Technical Support Personnel
  • Juniper Networks Partners and Resellers
  • Service Provider Operations Staff
  • IT Professionals working with QoS and traffic management
  • Professionals preparing for Juniper Networks Certification Programs (JNCIP, JNCIE)


Learning Objectives - What you will Learn in this Junos Class of Service (JCOS)?

Introduction to Learning Outcomes and Concepts

The Junos Class of Service (JCOS) course provides an in-depth understanding of CoS mechanisms within Junos, enabling efficient management of packet flows and service levels on Juniper networks.

Learning Objectives and Outcomes

  • Comprehend the history, evolution, and role of Class of Service (CoS) in modern networks.
  • Understand the relationship and differentiation between CoS and Differentiated Services (DiffServ).
  • Learn to identify and interpret CoS fields in packet headers and understand their significance in CoS processing.
  • Master the techniques of packet classification and how to apply different classification methods such as fixed, multifield, and behavior aggregate.
  • Gain expertise in configuring and managing policing on Juniper devices, including single-rate two-color and tricolor marking policers.
  • Acquire the ability to set up and customize scheduling features, including transmission rate, queue priority, delay buffers, and drop profiles.
  • Develop skills in hierarchical scheduling, understanding scheduler modes, levels, and queue properties within this context.
  • Learn to create and apply rewrite rules and tables to modify packet headers for CoS purposes.
  • Configure CoS-based forwarding (CBF) to ensure appropriate packet treatment based on CoS requirements.
  • Apply the acquired knowledge through a practical case study focusing on Voice over IP (VoIP), assessing CoS configurations across ingress, transit, and egress nodes.

Target Audience for Junos Class of Service (JCOS)

The Junos Class of Service (JCOS) course is designed for network professionals who manage and optimize Juniper Networks infrastructure.


Target audience for the Junos Class of Service (JCOS) course includes:


  • Network Engineers and Specialists
  • Network Administrators
  • Network Architects
  • Technical Support Personnel
  • Juniper Networks Partners and Resellers
  • Service Provider Operations Staff
  • IT Professionals working with QoS and traffic management
  • Professionals preparing for Juniper Networks Certification Programs (JNCIP, JNCIE)


Learning Objectives - What you will Learn in this Junos Class of Service (JCOS)?

Introduction to Learning Outcomes and Concepts

The Junos Class of Service (JCOS) course provides an in-depth understanding of CoS mechanisms within Junos, enabling efficient management of packet flows and service levels on Juniper networks.

Learning Objectives and Outcomes

  • Comprehend the history, evolution, and role of Class of Service (CoS) in modern networks.
  • Understand the relationship and differentiation between CoS and Differentiated Services (DiffServ).
  • Learn to identify and interpret CoS fields in packet headers and understand their significance in CoS processing.
  • Master the techniques of packet classification and how to apply different classification methods such as fixed, multifield, and behavior aggregate.
  • Gain expertise in configuring and managing policing on Juniper devices, including single-rate two-color and tricolor marking policers.
  • Acquire the ability to set up and customize scheduling features, including transmission rate, queue priority, delay buffers, and drop profiles.
  • Develop skills in hierarchical scheduling, understanding scheduler modes, levels, and queue properties within this context.
  • Learn to create and apply rewrite rules and tables to modify packet headers for CoS purposes.
  • Configure CoS-based forwarding (CBF) to ensure appropriate packet treatment based on CoS requirements.
  • Apply the acquired knowledge through a practical case study focusing on Voice over IP (VoIP), assessing CoS configurations across ingress, transit, and egress nodes.