QoS Ultimate Masterclass by Arash Deljoo

Name: QoS Ultimate Masterclass by Arash Deljoo
Rating: 4.6 (123 reviews)

Master Cisco QoS with Traffic Classification, Marking, Queuing, Policing, Shaping, and Hands-On Labs

Created byArash Deljoo

Last updated 10/2026

English

English [Auto],Thai [Auto],

What you'll learn

Understand the core QoS concepts, including bandwidth, delay, jitter, and packet loss, and why QoS is essential for data, voice, and video traffic.
Classify and mark traffic across Layers 2–7, including DSCP, IP Precedence, CoS, MPLS EXP, Wi-Fi TID, IPv6 Traffic Class, and NBAR-based identification.
Use Modular QoS CLI (MQC) to create class maps, policy maps, and service policies for implementing QoS in Cisco networks.
Analyze multiple queuing algorithms, including FIFO, PQ, CQ, RR, WRR, MDRR, WFQ, CBWFQ, and LLQ, and understand how each affects traffic handling.
Configure and verify queuing mechanisms, including WFQ, CBWFQ, and LLQ, for prioritizing real-time and mission-critical traffic.
Implement traffic policing and shaping, including token bucket models, dual-rate policing, and class-based shaping with practical examples.
Apply congestion avoidance techniques, including RED, WRED, ECN, and understanding TCP congestion behavior.
Configure traffic compression, including TCP, RTP, and class-based header compression for bandwidth optimization.
Deploy Link Fragmentation and Interleaving (LFI) and understand its role with queues and Multilink PPP to reduce delay on slow links.
Design end-to-end QoS strategies that integrate classification, marking, queuing, policing, shaping, congestion avoidance, and compression.
Troubleshoot QoS behaviors using Cisco IOS verification tools, show commands, and best practices.

Course content

8 sections • 52 lectures • 20h 14m total length

QoS Basics for Data, Voice, and Video1:17:58
1- Quality of Service [QoS] Introduction
2- Quality of Service [QoS] Bandwidth Introduction
3- Quality of Service [QoS] Delay Introduction
4- Quality of Service [QoS] Jitter Introduction
5- Quality of Service [QoS] Packet Loss Introduction
6- Types of Traffic : Data Introduction and QoS Requirement
7- Types of Traffic : Voice Introduction and QoS Requirement
8- Types of Traffic : Video Introduction and QoS Requirement
9- Quality of Experience [QoE] Introduction
10- Voice Codec Introduction
11- Video Codec Introduction
QoS Basics for Data, Voice, and Video Quiz
QoS Fundamentals , Bandwidth, Delay, Jitter, and Loss1:20:48
1- The Need for QoS because of Lack of Bandwidth Introduction
2- The Need for QoS because of Latency and Jitter Introduction
3- The Need for QoS because of Packet Loss Introduction
4- The Propagation Delay Introduction
5- The Serialization Delay Introduction
6- The Processing Delay Introduction
7- The Delay Variation ( Jitter ) Introduction
8- The ITU Recommendation G.114 Introduction
QoS Fundamentals , Bandwidth, Delay, Jitter, and Loss Quiz

QoS Models , Best Effort , IntServ, and DiffServ32:18
1- QoS Implementation Models Introduction
2- Best Effort (BE) Model Introduction
3- Integreated Service (IntServ) Model Introduction
4- Resource ReServation Protocol (RSVP) Introduction
5- Diffrentiated Service (DiffServ) Model Introduction
QoS Models , Best Effort , IntServ, and DiffServ Quiz
QoS Classification & L3 Marking Fundamentals1:41:22
1- Quality of Service [QoS] Classification Introduction
2- Quality of Service [QoS] Marking Introduction
3- Quality of Service [QoS] ACL Classification Introduction
4- Quality of Service [QoS] IP Precedence [IPP] Marking Introduction
5- Quality of Service [QoS] Differentiated Service Code Point [DSCP] Marking Introduction
6- Differentiated Service Code Point [DSCP] Class Selector [CS] Introduction
7- Differentiated Service Code Point [DSCP] Assured Forwarding [AF] Introduction
8- Forward Precedence and Drop Precedence Introduction
9- Differentiated Service Code Point [DSCP] Expedited Forwarding [EF] Introduction
10- Guidelines for DSCP Marking Values Introduction
QoS Classification & L3 Marking Fundamentals Quiz
QoS Marking Essentials , CoS, MPLS EXP, TID, IPv6, and NBAR58:21
1- Quality of Service [QoS] Layer 2 Marking Introduction
2- Quality of Service [QoS] Layer 2 Class of Service [CoS] Marking Introduction
3- Quality of Service [QoS] Layer 2.5 MPLS Experimental Bit Marking Introduction
4- Quality of Service [QoS] Layer 2 Wi-Fi Traffic IDentifier [TID] Marking Introduction
5- Quality of Service [QoS] Layer 3 IPv6 Traffic Class Marking Introduction
6- Network Based Application Recognition [NBAR] Introduction
7- Network Based Application Recognition [NBAR] Example Configuration
8- Classification and Marking Trust Boundary Introduction
QoS Marking Essentials , CoS, MPLS EXP, TID, IPv6, and NBAR Quiz
QoS Classification & Marking Across All Layers55:02
1- Classification Introduction
2- Internal Classification Introduction
3- Layer 1 Classification Introduction
4- Layer 2 Classification Introduction
5- Layer 3 Classification Introduction
6- Layer 2.5 Classification Introduction
7- Layer 4 Classification Introduction
8- Layer 7 Classification Introduction
9- Marking Introduction
10- Internal Marking Introduction
11- Layer 2 Marking Introduction
12- Layer 2.5 Marking Introduction
13- Layer 3 Marking Introduction
14- DSCP Per-Hop Behaviors Introduction
15- Trust Boundary Introduction
16- Wireless QoS Introduction
QoS Classification & Marking Across All Layers Quiz

Modular QoS CLI (MQC) Fundamentals15:39
1- What is Modular QoS CLI (MQC)?
2- The Three Pillars of MQC
3- Class Maps: Defining Traffic Types
4- Policy Maps: Applying QoS Actions
5- Service Policies: Applying Policies to Interfaces
6- Class-Based QoS Actions
7- Handling Unclassified Traffic
8- Hierarchical QoS Policies
9- Practical Scenario
Modular QoS CLI (MQC) Fundamentals Quiz
MQC Traffic Classification Essentials19:27
1- What is Traffic Classification?
2- The match Command - Our Traffic Filter
3- Combining Rules: match-all vs. match-any
4- Common match Commands in Action
5- The Empty Class-Map (match none)
6- The Catch-All Class-Map (match any)
7- NBAR2 match protocol Commands
8- Bringing It All Together - A Complete Example
MQC Traffic Classification Essentials Quiz
QoS Marking Methods and Fields4:12
1- The Purpose and Concept of Class-Based Marking
2- The Two Primary Methods for Marking
3- The Specific Fields That Can Be Marked
4- Practical Application with a Configuration Example
QoS Marking Methods and Fields Quiz

Queueing Concepts and Scheduling Basics24:38
1- Cisco Router Queuing Concepts Review
2- Single FIFO Queue Introduction
3- Dual FIFO Output Queues Introduction
4- Key concepts regarding queue length Introduction
5- Queue scheduling , service algorithm Introduction
Queueing Concepts and Scheduling Basics Quiz
Hardware vs. Software Queues in QoS27:32
1- Hardware Queue Introduction
2- Hardware Queue Usage
3- Hardware Queue Verification
4- Hardware Queue Configuration
5- Software Queue Introduction
6- Software Queue Usage
7- Software Queue Verification
8- Effect of Hardware Queue on Software Queue
Hardware vs. Software Queues in QoS Quiz
FIFO Queuing Fundamentals12:53
1- First In First Out [FIFO] Queuing Introduction
2- First In First Out [FIFO] Queuing Usage
3- First In First Out [FIFO] Queuing Verification
FIFO Queuing Fundamentals Quiz
Priority Queuing (PQ) Fundamentals32:33
1- Priority Queuing [PQ] Introduction
2- Priority Queuing [PQ] High,Medium,Normal,Low Queues Introduction
3- Priority Queuing [PQ] Scheduling Logic Introduction
4- Priority Queuing [PQ] Configuration
5- Priority Queuing [PQ] Verification
6- Priority Queuing [PQ] Advantages and Disadvantages Introduction
Priority Queuing (PQ) Fundamentals Quiz
Round Robin and Custom Queuing Fundamentals38:49
1- Round Robin Queuing Introduction
2- Weighted Round Robin [WRR] Queuing Introduction
3- Custom Queuing [CQ] Introduction
4- Custom Queuing [CQ] Scheduling Logic Introduction
5- Custom Queuing [CQ] Configuration
6- Custom Queuing [CQ] Verification
7- Custom Queuing [CQ] Advantages and Disadvantages Introduction
Round Robin and Custom Queuing Fundamentals Quiz
MDRR Queuing Fundamentals21:46
1- Modified Deficit Round Robin (MDRR) Queuing Algorithm Introduction
2- Modified Deficit Round Robin (MDRR) Quantum Value (QV) Introduction
3- Modified Deficit Round Robin (MDRR) Deficit Counter (DC) Introduction
MDRR Queuing Fundamentals Quiz
Weighted Fair Queuing (WFQ) Fundamentals26:54
1- Weighted Fair Queuing (WFQ) Introduction
2- Weighted Fair Queuing (WFQ) versus Priority Queuing (PQ) and Custom Queuing (CQ)
3- Weighted Fair Queuing (WFQ) Classification
4- Traffic Flow Introduction
Weighted Fair Queuing (WFQ) Fundamentals Quiz
WFQ Scheduler Fundamentals39:06
1- Weighted Fair Queuing (WFQ) Scheduler Introduction
2- Weighted Fair Queuing (WFQ) Sequence Number introduction
3- Weighted Fair Queuing (WFQ) Weight introduction
4- Weighted Fair Queuing (WFQ) Scheduler examples
WFQ Scheduler Fundamentals Quiz
WFQ Queue Structure and Drop Mechanisms16:53
1- Weighted Fair Queuing (WFQ) Drop Policy Introduction
2- Weighted Fair Queuing (WFQ) Number of Queues introduction
3- Weighted Fair Queuing (WFQ) Queue Length introduction
4- Congestive Discard Threshold (CDT) introduction
5- Hold Queue Limit introduction
6- WFQ Special Queues introduction
WFQ Queue Structure and Drop Mechanisms Quiz
WFQ Configuration and Verification Basics16:43
1- Weighted Fair Queueing (WFQ) Configuration Commands Introduction
2- Weighted Fair Queueing (WFQ) Example
3- Weighted Fair Queueing (WFQ) Verification Commands Introduction
WFQ Configuration and Verification Basics Quiz
Class-Based WFQ (CBWFQ) Fundamentals17:45
1- Class Based WFQ (CBWFQ) Introduction
2- Class Based WFQ (CBWFQ) classification Introduction
3- Class Based WFQ (CBWFQ) drop policy Introduction
4- Class Based WFQ (CBWFQ) number of queues Introduction
5- Class Based WFQ (CBWFQ) Maximum queue length Introduction
6- Class Based WFQ (CBWFQ) Scheduling inside a single queue Introduction
7- Class Based WFQ (CBWFQ) Scheduling among all queues Introduction
Class-Based WFQ (CBWFQ) Fundamentals Quiz
CBWFQ Configuration Fundamentals41:44
1- Class Based WFQ (CBWFQ) Introduction
2- Class Based WFQ (CBWFQ) Class Map Configuration Introduction
3- Class Based WFQ (CBWFQ) Policy Map Configuration Introduction
4- Class Based WFQ (CBWFQ) Service Policy Configuration Introduction
5- Class Based WFQ (CBWFQ) Queue Length Configuration Introduction
6- Class Based WFQ (CBWFQ) Bandwidth Reservation Configuration Example
CBWFQ Configuration Fundamentals Quiz
Low Latency Queuing (LLQ) Fundamentals17:19
1- Low Latency Queuing (LLQ) Introduction
2- Low Latency Queuing (LLQ) Priority Queue Introduction
3- Low Latency Queuing (LLQ) vs. Priority Queuing
Low Latency Queuing (LLQ) Fundamentals Quiz
Low Latency Queuing (LLQ) Configuration12:37
1- Low Latency Queuing (LLQ) Configuration Command Introduction
2- Low Latency Queuing (LLQ) Configuration
3- Comparisons of WFQ, CBWFQ, and LLQ
Low Latency Queuing (LLQ) Configuration Quiz

Traffic Policing and Shaping Fundamentals28:41
1- Traffic Policing and Shaping Overview
2- Why Use Traffic Conditioners?
3- Traffic Policing Example Introduction
4- Traffic Shaping Example Introduction
5- Policing vs. Shaping Introduction
Traffic Policing and Shaping Fundamentals Quiz
Traffic Shaping Mechanics and Key Parameters26:22
1- Mechanics of Traffic Shaping introduction
2- Tc (Time interval) introduction
3- Bc (Committed burst size) introduction
4- CIR (Committed information rate) introduction
5- Shaped Rate introduction
Traffic Shaping Mechanics and Key Parameters Quiz
Traffic Shaping vs. Policing When It Matters24:19
1- Traffic Shaping—When and Where?
2- Policing and Shaping, Versus Just Policing introduction
3- Egress Blocking introduction
4- Mechanics of Traffic Shaping introduction
Traffic Shaping vs. Policing When It Matters Quiz
Traffic Shaping with Excess Burst24:45
1- Traffic Shaping with No Excess Burst Introduction
2- Traffic Shaping with Excess Burst introduction
3- Class Based Traffic Shaping introduction
Traffic Shaping with Excess Burst Quiz
Queuing Options in Traffic Shaping18:50
1- Options for Queuing in Traffic-Shaping Tools Introduction
2- Decision Logic for Queuing with Shaping Enabled introduction
3- Cisco IOS Traffic-Shaping Mechanisms introduction
Queuing Options in Traffic Shaping Quiz
Traffic Shaping Adaptation and Feedback Signals15:08
1- Traffic-Shaping Adaption Introduction
2- Forward Explicit Congestion Notification (FECN) introduction
3- Backward Explicit Congestion Notification (BECN) introduction
4- Minimum Information Rate (MIR) introduction
5- Foresight Feedback introduction
Traffic Shaping Adaptation and Feedback Signals Quiz
Generic Traffic Shaping (GTS) Fundamentals16:43
1- Generic Traffic Shaping (GTS) introduction
2- Generic Traffic Shaping (GTS) configuration
3- Generic Traffic Shaping (GTS) verification
Generic Traffic Shaping (GTS) Fundamentals Quiz
Class-Based Traffic Shaping (CBTS) Fundamentals37:04
1- Class-Based Traffic Shaping (CBTS) introduction
2- Traffic Shaping Methods Introduction
3- Class-Based Traffic Shaping (CBTS) Configuration
4- Class-Based Traffic Shaping (CBTS) without CBWFQ Introduction
5- Class-Based Traffic Shaping (CBTS) CBWFQ Introduction
Class-Based Traffic Shaping (CBTS) Fundamentals Quiz
CBTS Example Configuration and Verification9:22
1- Class-Based Traffic Shaping example introduction
2- Class-Based Traffic Shaping example Configuration
3- Class-Based Traffic Shaping example Verification
CBTS Example Configuration and Verification Quiz
Class-Based Shaping Configuration Basics17:26
1- Class-Based Shaping Configuration introduction
2- Command Reference for Class-Based Shaping introduction
3- Class-Based Shaping Example Configuration
4- Class-Based Shaping Example Verification
Class-Based Shaping Configuration Basics Quiz
Adjusting Tc by Modifying Bc8:02
1- Setting Bc to Tune Tc introduction
2- Setting Bc to Tune Tc Configuration
3- Setting Bc to Tune Tc Verification
Adjusting Tc by Modifying Bc Quiz
Traffic Rate Measurement & Token Bucket Basics12:51
1- Measuring Traffic Rates introduction
2- Single Token Bucket introduction
3- Token introduction
4- Token Bucket introduction
Traffic Rate Measurement & Token Bucket Basics Quiz
Single Token Bucket Policing Fundamentals15:11
1- Single Token Bucket Class-Based Policing introduction
2- CIR (Commited Information Rate) introduction
3- Bc (Burst Size) introduction
4- Tc (Commited Time Windows) introduction
5- Relation between CIR,Bc,Tc introduction
Single Token Bucket Policing Fundamentals Quiz
Dual Token Bucket Policing Fundamentals13:50
1- Dual Token Bucket Class-Based Policing introduction
2- Be (Excess Burst Size) introduction
3- Te (Tokens in Be Bucket) introduction
4- Tc (Tokens in Bc Bucket) introduction
Dual-Rate Token Bucket Policing Fundamentals19:28
1- Dual-Rate Token Bucket Class-Based Policing introduction
2- CIR (Commited Information Rate) introduction
3- PIR (Peak Information Rate) introduction
4- Tc (Tokens in CIR Bucket) introduction
5- Tp (Tokens in PIR Bucket) introduction

Congestion Avoidance and Drop Policies4:34
1- Congestion Avoidance Through Drop Policies Introduction
2- Cisco congestion-avoidance tools Introduction
TCP/UDP Behavior and Congestion Control Basics20:37
1- TCP and UDP Reactions to Packet Loss Introduction
2- Receiver window or the advertised window Introduction
3- Congestion window, or CWND Introduction
4- Growing CWND for each Received Acknowledgement Introduction
5- Graphs of CWND with Slow Start and Congestion Avoidance Introduction
Congestion Avoidance , Tail Drop, Sync, and WRED6:50
1- Queue Tail Drop Introduction
2- Global Synchronization Introduction
3- TCP Starvation Introduction
4- Weighted RED (WRED) Introduction
Random Early Detection (RED) Fundamentals13:08
1- Random Early Detection (RED) Introduction
2- Actual queue depth Introduction
3- Average queue depth Introduction
4- Minimum threshold Introduction
5- Maximum threshold Introduction
6- Mark probability denominator Introduction
7- Exponential weighting constant Introduction
8- RED No Drop Area Introduction
9- RED Random Drop Area Introduction
10- RED Full Drop Area Introduction
Weighted RED (WRED) Fundamentals14:47
1- Weighted RED (WRED) Introduction
2- How WRED Weights Packets Introduction
3- Cisco IOS Software-Default WRED Profiles for Precedence-Based WRED Introduction
4- Cisco IOS Software-Default WRED Profiles for DSCP-Based WRED
WRED Interaction with Queuing Models7:31
1- FIFO Output Queue and WRED Interaction Introduction
2- WRED with CBWFQ Introduction
Explicit Congestion Notification (ECN) Fundamentals13:18
1- Explicit Congestion Notification (ECN) Introduction
2- ECN Bits in DSCP Byte Introduction
3- Example of ECN Signaling to Reduce CWND Introduction

QoS Payload & Header Compression Basics10:34
1- Payload compression Introduction
2- Header compression Introduction
3- Compression ratio Introduction
4- Delay Versus Bandwidth with Compression Introduction
IP Transport Headers , TCP, UDP, and RTP5:28
1- IP/TCP Header Introduction
2- IP/UDP/RTP Header Introduction
QoS Class-Based TCP/RTP Header Compression9:02
1- Class-Based TCP and RTP Header Compression Configuration Introduction
2- Class-Based TCP and RTP Header Compression Configuration Implementation
3- Class-Based TCP and RTP Header Compression Configuration Verification
Class-Based TCP Header Compression Setup8:19
1- Class-Based TCP Header Configuration
2- Class-Based TCP Header Verification

Requirements

No prior QoS knowledge is required — everything is explained step by step from the ground up.
Interest in developing professional networking skills in enterprise QoS.
This course is designed to be accessible, even for learners with limited QoS experience.
Basic networking knowledge (IP addressing, routing, switching concepts).
Familiarity with Cisco IOS commands (helpful but not required).
Access to a Cisco lab environment such as: Cisco Packet Tracer GNS3 EVE-NG CML (Cisco Modeling Labs) (optional but useful for hands-on practice)

Description

Welcome to QoS Ultimate Masterclass by Arash Deljoo, a comprehensive training course designed to help network engineers master Quality of Service (QoS) technologies, from fundamental concepts to advanced traffic management and optimization.

This course combines detailed theoretical explanations, professional network diagrams, step-by-step configurations, verification techniques, troubleshooting scenarios, and practical hands-on laboratories to develop your QoS expertise.

You will begin by understanding QoS fundamentals, network congestion, bandwidth management, latency, jitter, packet loss, and the importance of traffic prioritization in modern networks.

As you progress, you will explore traffic classification, marking, Differentiated Services (DiffServ), DSCP, IP Precedence, Class of Service (CoS), queuing mechanisms, congestion management, and congestion avoidance.

The course also covers advanced QoS technologies, including traffic policing, traffic shaping, Weighted Random Early Detection (WRED), Low Latency Queuing (LLQ), and Class-Based Weighted Fair Queuing (CBWFQ).

Through practical Cisco configurations and verification demonstrations, you will learn how to implement, optimize, and troubleshoot QoS policies across enterprise and service provider networks.

Whether you are preparing for Cisco CCNP or CCIE certification exams, improving application performance, or advancing your networking career, this masterclass provides valuable technical knowledge and practical skills.

Master Cisco QoS, optimize network performance, and develop professional traffic management expertise with Arash Deljoo.

Who this course is for:

Network Engineers and Administrators who need to design, implement, or troubleshoot QoS policies.
CCNA, CCNP, and CCIE candidates preparing for Cisco certification exams where QoS is a major topic.
IT Professionals working with voice, video, or real-time applications who need to ensure reliable performance.
Engineers transitioning to service provider or enterprise roles requiring strong QoS fundamentals.
Students and beginners in networking who want to build a solid foundation in QoS from scratch.
Anyone working with converged networks that carry data, voice, and video traffic.
Network designers/architects seeking to build end-to-end QoS strategies across complex infrastructures.

QoS Ultimate Masterclass by Arash Deljoo

What you'll learn

Explore related topics

Course content

QoS Foundations2 lectures • 2hr 39min

QoS Models , Classification & Marking4 lectures • 4hr 7min

Modular QoS CLI (MQC)3 lectures • 39min

QoS Queuing Concepts & Algorithms14 lectures • 5hr 47min

QoS Traffic Policing & Shaping15 lectures • 4hr 48min

QoS Congestion Avoidance7 lectures • 1hr 21min

QoS Traffic Compression4 lectures • 33min

QoS Link Fragmentation & Interleaving3 lectures • 20min

Requirements

Description

Who this course is for: