Free CCNA | OSI Model | Day 3 Lab | CCNA 200-301 Complete Course

Introduction

This tutorial will guide you through the OSI model as demonstrated in Day 3 of the Free CCNA 200-301 course. Understanding the OSI model is crucial for networking professionals, as it provides a framework for understanding how different networking protocols interact. This lab focuses on examining network traffic to see the OSI model in action.

Step 1: Setting Up the Lab

To get started, you need to set up your lab environment. Follow these steps:

1. Download and Install Packet Tracer

   • Visit the NetAcad website and download Packet Tracer.
   • Install the application on your computer.

2. Open Packet Tracer

   • Launch the Packet Tracer application.

3. Create a New Project

   • Start a new project by selecting 'File' and then 'New'.

4. Add Devices

   • Drag and drop the following devices onto the workspace:
     • 2 PCs
     • 1 Switch
   • Connect the PCs to the switch using copper straight-through cables.

5. Configure the Devices

   • Assign IP addresses to the PCs.
     • PC1: 192.168.1.1 /24
     • PC2: 192.168.1.2 /24
   • Ensure both PCs can communicate with each other on the same network.

Step 2: Initiating Network Traffic

Now that your lab is set up, you will generate and observe network traffic. Follow these steps:

1. Ping Test

   • On PC1, open the command prompt.
   • Type ping 192.168.1.2 and press Enter.
   • Observe the results. Successful replies indicate that the devices are communicating.

2. Use Packet Tracer Simulation Mode

   • Switch to simulation mode in Packet Tracer.
   • Initiate the ping command again to see the packets being sent across the network.
   • Click on the packets to view details.

3. Analyze the OSI Layers

   • As you examine the packets, notice how they relate to the OSI model:
     • Layer 1 (Physical): Physical connection details.
     • Layer 2 (Data Link): MAC addresses.
     • Layer 3 (Network): IP addresses and routing information.
   • Understanding these layers will help you troubleshoot and design networks effectively.

Conclusion

In this lab, you successfully set up a basic network, generated traffic, and observed how data flows through the OSI model. This hands-on experience is invaluable for grasping networking concepts.

Next Steps

• Review the OSI model in your CCNA study materials.
• Experiment with different configurations in Packet Tracer.
• Continue with the next lessons in the CCNA course to deepen your understanding of networking principles.