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Implementing Cisco Quality of Service (QoS)

Course Code

TO131

Duration

5 Days

Due to the pace and duration of this course, ideal candidates for this course operate in medium to very large computing environment:

  • They have a minimum of one-year experience working in a LAN/WAN environment
  • They have a minimum of six months experience in a multi-LAN environment
  • Hold the Cisco Certified Network Associate (CCNA) certification
This course provides the knowledge and skills necessary to configure and troubleshoot Cisco IOS routers running Quality of Service protocols in Service Provider and Enterprise environments.
This course is designed for IT professionals who have a large amount of experience with network design and implementation.

Upon completing this course, participants will be able to:

  • Given a description of a converged network, identify problems that could lead to poor quality of service and explain how the problems might be resolved
  • Define the term Quality of Service (QoS) and identify and explain the key steps to implementing QoS on a converged network
  • List and explain the models for providing Quality of Service on a network
  • Explain the purpose and function of the DiffServ model
  • Describe the basic format of and explain the purpose of the DSCP field in the IP header
  • Define and explain the different per hop behaviors used in DSCP
  • Explain the interoperability between DSCP-based and IP-precedence-based devices in a network
  • Given a list of QoS actions, correctly match the QoS actions to mechanisms for implementing QoS and identify where in a network the different QoS mechanisms are commonly used
  • Given a network requiring QoS, explain how to implement a QoS policy using MQC
  • Explain how AutoQoS is used to implement QoS policy
  • Explain how link layer and network layer markings are used to define service classes and the different applications represented by each of these service classes
  • Given a network and a description of QoS issues, use MQC CLI commands to classify packets
  • Given a network and a description of QoS issues, use class-based marking to assign packets to a specific service class
  • Describe the function of Network Based Application Recognition
  • Describe the purpose of pre-classification to support QoS in various VPN (IPSEC, GRE, L2TP) configurations
  • Describe QoS trust boundaries and their significance in LAN based classification and marking
  • Identify the different classification and marking options available on Cisco L2 and L3 switching platforms
  • List and explain the different queuing algorithms
  • Explain the components of hardware and software queuing systems on Cisco routers and how they are effected by tuning and congestion
  • Describe the benefits and drawbacks of using WFQ to implement QoS
  • Explain the purpose and features of Class-Based WFQ (CBWFQ)
  • Explain the purpose and features of Low Latency Queuing (LLQ)
  • Identify the Cisco IOS commands required to configure and monitor LLQ on a Cisco router
  • Describe and explain the different queuing capabilities available on the Cisco Catalyst 2950 Switch
  • Describe the drawbacks tail drop as a congestion control mechanism
  • Describe the elements of a RED traffic profile
  • Describe Weighted Random Early Detection and how it can be used to prevent congestion
  • Identify the Cisco IOS commands required to configure and monitor DSCP-based CB-WRED
  • Explain how ECN interacts with WRED in Cisco IOS
  • Describe the purpose of traffic conditioning using traffic policing and traffic shaping and differentiate between the features of each
  • Explain how network devices measure traffic rates using single rate or dual rate, single or dual token bucket mathematical models
  • Identify the Cisco IOS commands required to configure and monitor single rate and dual rate CB-Policing
  • Identify the Cisco IOS commands required to configure and monitor percentage based CB-Policing
  • Explain how the two rate limits, average rate and peak rate, can be used to rate limit traffic
  • Identify the Cisco IOS commands required to configure and monitor CB-Shaping
  • Identify the Cisco IOS commands required to configure and monitor Frame Relay adaptive CB-Shaping on Frame Relay interfaces
  • Explain the various link efficiency mechanisms and their function
  • Identify the Cisco IOS commands required to configure and monitor CB header compression
  • Given a list of link speeds and a specific delay requirement, determine the proper fragment size to use at each link speed and identify the typical delay requirement for VoIP packets
  • Identify the Cisco IOS commands required to configure and monitor Multilink PPP with Interleaving
  • Identify the Cisco IOS commands required to configure and monitor FRF.12
  • Explain the QoS requirements of the different application types
  • List typical enterprise traffic classes then identify the delay, jitter, packet loss and bandwidth requirements of each traffic class
  • Explain the best practice QoS implementations and configurations within the campus LAN
  • Explain the best practice QoS implementations and configurations on the WAN customer edge (CE) and provider edge (PE) routers
  • A solid credential that can be utilized in any industry
  • Validation of achievement in an industry-valued skill
  • Viable career path, leading to higher level positions
IP QoS Fundamentals
Given a description of a converged network, identify problems that could lead to poor quality of service and explain how the problems might be resolved
Define the term Quality of Service (QoS) and identify and explain the key steps to implementing QoS on a converged network

IP QoS Components
List and explain the models for providing Quality of Service on a network
Explain the purpose and function of the DiffServ model
Describe the basic format of and explain the purpose of the DSCP field in the IP header
Define and explain the different per hop behaviors used in DSCP
Explain the interoperability between DSCP-based and IP-precedence-based devices in a network
Given a list of QoS actions, correctly match the QoS actions to mechanisms for implementing QoS and identify where in a network the different QoS mechanisms are commonly used

Modular QoS CLI and Auto-QoS
Given a network requiring QoS, explain how to implement a QoS policy using MQC
Explain how AutoQoS is used to implement QoS policy

Classification and Marking
Explain how link layer and network layer markings are used to define service classes and the different applications represented by each of these service classes
Given a network and a description of QoS issues, use MQC CLI commands to classify packets
Given a network and a description of QoS issues, use class-based marking to assign packets to a specific service class
Describe the function of Network Based Application Recognition
Describe the purpose of pre-classification to support QoS in various VPN (IPSEC, GRE, L2TP) configurations
Describe QoS trust boundaries and their significance in LAN based classification and marking
Identify the different classification and marking options available on Cisco L2 and L3 switching platforms

Congestion Management Methods
List and explain the different queuing algorithms
Explain the components of hardware and software queuing systems on Cisco routers and how they are affected by tuning and congestion
Describe the benefits and drawbacks of using WFQ to implement QoS
Explain the purpose and features of Class-Based WFQ (CBWFQ)
Explain the purpose and features of Low Latency Queuing (LLQ)
Identify the Cisco IOS commands required to configure and monitor LLQ on a Cisco router
Describe and explain the different queuing capabilities available on the Cisco Catalyst 2950 Switch

Congestion Avoidance Methods
Describe the drawbacks tail drop as a congestion control mechanism
Describe the elements of a RED traffic profile
Describe Weighted Random Early Detection and how it can be used to prevent congestion
Identify the Cisco IOS commands required to configure and monitor DSCP-based CB-WRED
Explain how ECN interacts with WRED in Cisco IOS

Traffic Policing and Shaping
Describe the purpose of traffic conditioning using traffic policing and traffic shaping and differentiate between the features of each
Explain how network devices measure traffic rates using single rate or dual rate, single or dual token bucket mathematical models
Identify the Cisco IOS commands required to configure and monitor single rate and dual rate CB-Policing
Identify the Cisco IOS commands required to configure and monitor percentage based CB-Policing
Explain how the two rate limits, average rate and peak rate, can be used to rate limit traffic
Identify the Cisco IOS commands required to configure and monitor CB-Shaping
Identify the Cisco IOS commands required to configure and monitor Frame Relay adaptive CB-Shaping on Frame Relay interfaces

Link Efficiency Mechanisms
Explain the various link efficiency mechanisms and their function
Identify the Cisco IOS commands required to configure and monitor CB header compression
Given a list of link speeds and a specific delay requirement, determine the proper fragment size to use at each link speed and identify the typical delay requirement for VoIP packets
Identify the Cisco IOS commands required to configure and monitor Multilink PPP with Interleaving
Identify the Cisco IOS commands required to configure and monitor FRF.12

QoS Best Practices
Explain the QoS requirements of the different application types
List typical enterprise traffic classes then identify the delay, jitter, packet loss and bandwidth requirements of each traffic class
Explain the best practice QoS implementations and configurations within the campus LAN
Explain the best practice QoS implementations and configurations on the WAN customer edge (CE) and provider edge (PE) routers
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