Contents
“Do I Know This Already?” Quiz
QoS: Tuning Bandwidth, Delay, Jitter, and Loss Questions
Traffic Characteristics of Voice, Video, and Data Questions
Planning and Implementing QoS Policies
QoS: Tuning Bandwidth, Delay, Jitter, and Loss
The clock rate Command Versus the bandwidth Command
QoS Tools That Affect Bandwidth
Summary: QoS Characteristics: Bandwidth, Delay, Jitter, and Loss
Traffic Characteristics of Voice, Video, and Data
Voice Bandwidth Considerations
Considering the Effects of Packetization and Codec Delay
Video Bandwidth Considerations
Comparing Voice and Video: Summary
Comparing Voice, Video, and Data: Summary
Planning and Implementing QoS Policies
Step 1: Identify Traffic and Its Requirements
Step 2: Divide Traffic into Classes
Step 3: Define Policies for Each Traffic Class
Chapter 2 QoS Tools and Architectures
“Do I Know This Already?” Quiz
Classifying Using Flows or Service Classes Questions
The Differentiated Services QoS Model Questions
The Integrated Services QoS Model Questions
Classification and Marking Tools
Link-Efficiency Tools: Summary
Classifying Using Flows or Service Classes
Proper Planning and Marking for Enterprises and Service Providers
The Differentiated Services QoS Model
DiffServ Specifications and Terminology
The Class Selector PHB and DSCP Values
The Assured Forwarding PHB and DSCP Values
The Expedited Forwarding PHB and DSCP Values
The Integrated Services QoS Model
Comparison of the Three QoS Models
Chapter 3 MQC, QPM, and AutoQoS
“Do I Know This Already?” Quiz Questions
Comparisons of CLI, MQC, and AutoQoS
Classification Using Class Maps
MQC Example 1: Voice and Everything Else
MQC Example 2: Matching ACLs and Using class-default
Example 3: Matching Opposites with match not
Example 4: Matching More Than One Thing
Example 5: Complex Matching with match-class
Performing QoS Actions (PHBs) Using policy-map Commands
Enabling a Policy Map Using service-policy
AutoQoS VoIP Default Configuration
More AutoQoS Configuration Options
AutoQoS VoIP for Cisco IOS Switches
AutoQoS VoIP Configuration for IOS Switches
AutoQoS VoIP for IOS Switch PHBs
Comparisons of CLI, MQC, and AutoQoS
Chapter 4 Classification and Marking
“Do I Know This Already?” Quiz Questions
Classification and Marking Concepts Questions
Classification and Marking Tools Questions
Classification Issues when Using VPNs Questions
Classification and Marking Concepts
IP Header QoS Fields: Precedence and DSCP
Classification and Marking Design Choices
Classification and Marking Tools
Class-Based Marking (CB Marking) Configuration
Network-Based Application Recognition (NBAR)
Miscellaneous Features of Class-Based Marking
Classification Issues when Using VPNs
Classification and Marking Before Entering the VPN Tunnel
Classification and Marking on the Router Creating the VPN Tunnel
Configuring QoS Pre-classification
Chapter 5 Congestion Management
“Do I Know This Already?” Quiz
Cisco Router Queuing Concepts Questions
Scheduling Concepts: FIFO, PQ, CQ, and MDRR Questions
Concepts and Configuration: WFQ, CBWFQ, and LLQ Questions
Software Queues and Hardware Queues
Queuing on Interfaces Versus Subinterfaces and Virtual Circuits (VCs)
Scheduling Concepts: FIFO, PQ, CQ, and MDRR
Concepts and Configuration: WFQ, CBWFQ, and LLQ
WFQ Drop Policy, Number of Queues, and Queue Lengths
LLQ with More Than One Priority Queue
LLQ and the bandwidth remaining percent Command
Comparisons of WFQ, CBWFQ, and LLQ
Scheduling Concepts: FIFO, PQ, CQ, and MDRR
Concepts and Configuration: WFQ, CBWFQ, and LLQ
Chapter 6 Traffic Policing and Shaping
“Do I Know This Already?” Quiz
Shaping and Policing Concepts Questions
Configuring Class-Based Shaping
Configuring Class-Based Policing
Traffic Policing and Traffic Shaping Concepts
When and Where to Use Shaping and Policing
Traffic Shaping—When and Where?
Traffic Shaping with No Excess Burst
Traffic Shaping with Excess Burst
Where to Shape: Interfaces, Subinterfaces, and VCs
CB Policing: Single-Rate, Two-Color (1 Bucket)
CB Policing: Dual Token Bucket (Single-Rate)
CB Policing: Dual Token Bucket (Dual Rate)
Summary of CB Policing Mechanics
Class-Based Shaping Configuration
Tuning Shaping for Voice Using LLQ and a Small Tc
Miscellaneous CB Shaping Configuration: Adaptive Shaping
Miscellaneous CB Shaping Configuration: Shaping by Percent
Class Based Policing Configuration
Policing a Subset of the Traffic
Configuring Dual-Rate Policing
CB Policing Defaults for Bc and Be
CB Policing Configuration Summary
Traffic Policing and Traffic Shaping Concepts
Class Based Shaping Configuration
Class Based Policing Configuration
Chapter 7 Congestion Avoidance Through Drop Policies
“Do I Know This Already?” Quiz
Congestion-Avoidance Concepts and RED Questions
Congestion-Avoidance Concepts and Random Early Detection (RED)
TCP and UDP Reactions to Packet Loss
Tail Drop, Global Synchronization, and TCP Starvation
Explicit Congestion Notification
Congestion-Avoidance Concepts and Random Early Detection (RED)
Explicit Congestion Notification
Chapter 8 Link Efficiency Tools
“Do I Know This Already?” Quiz
Link Fragmentation and Interleave Questions
Payload and Header Compression
Class-Based TCP and RTP Header Compression Configuration
Link Fragmentation and Interleaving
Maximum Serialization Delay and Optimum Fragment Sizes
Choosing Fragment Sizes for Frame Relay
Multilink PPP Interleaving Configuration
Frame Relay Fragmentation Configuration
MLP LFI and FRF.12 Configuration: The Short Version
“Do I Know This Already?” Quiz
Layer 2 Header Classification and Marking
Layer 3 Header Classification and Marking
Cisco IP Phone–Based Trust Boundaries
Configuring Trust Boundaries in an IP Telephony Environment
Using MQC for Classification and Marking
Verifying MQC Classification and Marking
Strict Priority and WRR Scheduling
Chapter 10 Cisco QoS Best Practices
“Do I Know This Already?” Quiz
The Need for QoS Best Practices
Application Requirements for QoS
QoS Best Practices Methodology
Classification and Marking Best Practices
Congestion Management Best Practices
Congestion Avoidance Best Practices
Enterprise Campus QoS Implementations
Enterprise (CE) to Service Provider (PE) WAN QoS Implementations
Service Provider (PE) to Enterprise (CE) WAN QoS Implementations
Service Provider Backbone QoS Implementations
Appendix A Answers to the “Do I Know This Already?” Quizzes and Q & A Sections
QoS: Tuning Bandwidth, Delay, Jitter, and Loss Questions
Traffic Characteristics of Voice, Video, and Data Questions
Planning and Implementing QoS Policies
Classifying Using Flows of Service Classes Questions
The Differentiated Services QoS Model Questions
The Integrated Services QoS Model Questions
Comparisons of CLI, MQC, and AutoQoS
Classification and Marking Concepts Questions
Classification and Marking Tools Questions
Classification Issues when Using VPNs Questions
Cisco Router Queuing Concepts Questions
Scheduling Concepts: FIFO, PQ, CQ, and MDRR Questions
Concepts and Configuration: WFQ, CBWFQ, and LLQ Questions
Scheduling Concepts: FIFO, PQ, CQ, and MDRR
Concepts and Configuration: WFQ, CBWFQ, and LLQ
Configuring Class-Based Shaping
Configuring Class-Based Policing
Class-Based Shaping Configuration
Class-Based Policing Configuration
Congestion-Avoidance Concepts and RED Questions
Congestion-Avoidance Concepts and Random Early Detection RED
Explicit Congestion Notification