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Network Troubleshooting with OSI Model with Real Example

“Learn to troubleshoot and fix real network problems using OSI layers, tools, and step-by-step methods"

Created byMohamed Arsath

Last updated 3/2026

English

What you'll learn

Troubleshoot real network problems using the OSI layer approach (step-by-step)
Think like a professional network engineer, not just follow theory
Identify and fix common issues in Layer 1 to Layer 7
Use essential tools like ping, tracert, ipconfig, nslookup, netstat, and arp
Diagnose problems related to IP address, gateway, DNS, routing, ports, and firewall
Understand why network problems happen, not just how to fix them
Solve real-world issues like: No internet connection, Website not loading, Email not sending, Network slow or unstable

Course content

8 sections • 8 lectures • 38m total length

Course Introduction & Mindset4:13
In this lecture, you will understand why troubleshooting is the most critical skill for any network engineer and how real-world problems are approached professionally.
Key topics covered:
Why networks fail in real environments
The difference between configuration vs troubleshooting skills
How expert engineers think like detectives
Introduction to the OSI-based troubleshooting mindset
? Download the attached PDF to explore real industry scenarios and build your troubleshooting thinking.

Common Mistakes Beginners Make in Network Troubleshooting3:31
In this lecture, you will learn the most common mistakes beginners make and how to avoid them to become a professional troubleshooter.
Key topics covered:
Why changing configuration blindly is dangerous
Importance of following the OSI layer approach
Why physical layer checks are critical
Proper questioning techniques for users
Importance of documentation
? Use the attached PDF as a checklist to avoid these mistakes in real situations.

Physical and Data link layer troubleshooting8:18
In this lecture, you will learn how to troubleshoot networks using structured methods starting from the physical and data link layers.
Key topics covered:
Bottom-up troubleshooting approach
Physical layer checks (cables, ports, power)
Data link layer issues (VLAN, MAC, loops)
Real-world troubleshooting examples
? Download the PDF for step-by-step real cases and solutions.

Network and Transport layer Troubleshooting5:45
In this lecture, you will continue troubleshooting using higher OSI layers including IP addressing, routing, and transport-level issues.
Key topics covered:
Network layer troubleshooting (IP, gateway, routing)
DNS and connectivity issues
Transport layer troubleshooting (ports, firewall)
Real-world examples with solutions
? Use the attached PDF to practice identifying Layer 3 and Layer 4 problems.

Session and presentation layer Troubleshooting3:49
In this lecture, you will learn how session and presentation layers impact real-world network issues, especially in secure and remote connections.
Key topics covered:
Session layer troubleshooting (timeouts, remote access issues)
Presentation layer concepts (encryption, SSL/TLS)
Certificate-related problems and solutions
Real-world troubleshooting scenarios
? Download the PDF to understand SSL errors and session-related issues in detail.

Application Layer Troubleshooting3:53
In this lecture, you will explore application-level troubleshooting and advanced troubleshooting strategies used by professional engineers.
Key topics covered:
Application layer issues (DNS, web, email servers)
Top-down troubleshooting method
Divide and conquer approach
Real-world troubleshooting workflow
? Use the PDF to follow a structured troubleshooting process used in real companies.

Requirements

Basic understanding of computers (how to use a PC and internet)
No prior networking knowledge required – everything is explained from scratch
A laptop or desktop to follow along with examples
Willingness to learn and think step-by-step like a network engineer

Description

Network Troubleshooting with OSI Model – Real-World Examples

Have you ever faced problems like:

Internet not working
Website not loading
Email not sending
Network slow or unstable

And didn’t know where to start?

This course will change that.

Learn to Think Like a Network Engineer

Most courses teach theory…

But in real life, problems don’t come with answers.

In this course, you will learn:

How to think step-by-step
How to identify the root cause
How to solve problems using logic (not guessing)

Master OSI-Based Troubleshooting (Simple & Powerful)

We use the OSI model as a roadmap to:

Find where the problem is
Fix it quickly
Avoid confusion

Even if you are a beginner…

You will understand everything in a very simple way

Learn Real Tools Used by Professionals

You will learn how to use:

ping
ipconfig / ifconfig
traceroute
nslookup
netstat
arp

These tools help you diagnose 80% of network problems

Real-World Troubleshooting Examples

This course is built around real problems, such as:

No internet due to wrong gateway
DNS issues (some websites not working)
VLAN and MAC flapping problems
Port blocking (HTTPS, email issues)
Firewall blocking applications
SSL certificate errors
Server and application failures

You will not just learn WHAT happens…
You will understand WHY it happens

Why This Course is Different

Explained in a very simple, easy-to-understand way
Uses real-world scenarios (not just theory)
Focuses on problem-solving mindset
Step-by-step structured learning

Even complex topics are explained like teaching a beginner.

Who This Course Is For

Beginners who want to understand networking
Students preparing for IT or networking careers
IT support staff and junior engineers
Anyone who wants to fix real network problems

What You Will Gain

By the end of this course, you will be able to:

Troubleshoot network problems using OSI layers
Use tools to diagnose issues quickly
Understand how networks behave in real life
Fix common and advanced network issues
Think like a professional network engineer

No Experience Needed

This course starts from basics
Everything is explained step-by-step

Final Message

Network troubleshooting is not about memorizing…

It’s about thinking.

And once you learn this skill…

You can solve problems in any network.

Enroll Now

Start learning today and become someone who can:

Fix problems
Save time
Add real value

Who this course is for:

Beginners who want to learn network troubleshooting step-by-step
Students preparing for IT, Networking, CCNA, or related careers
Anyone who struggles to understand networking and wants a simple explanation
IT support staff who want to improve their problem-solving skills
Network engineers who want to strengthen their real-world troubleshooting ability
Anyone who wants to learn how to fix real network problems step-by-step

Network Troubleshooting with OSI Model with Real Example

What you'll learn

Explore related topics

Course content

Introduction1 lecture • 4min

Lecture 02- Common Mistakes (IMPORTANT)1 lecture • 4min

Lecture 03- OSI Troubleshooting Method1 lecture • 8min

Lecture 04- OSI Layer troubleshooting Method1 lecture • 6min

Lecture 05 - OSI Layer Troubleshooting Method1 lecture • 4min

Lecture 06- OSI layer Troubleshooting1 lecture • 4min

Lecture 07- Basic Connectivity Troubleshooting Tools1 lecture • 5min

Lecture 8 - More troubleshooting technique1 lecture • 4min

Requirements

Description

Who this course is for: