Free CCNA | OSI Model | Day 3 Lab | CCNA 200-301 Complete Course
Welcome to Jeremy’s IT Lab
Introduction to the CCNA 200-301 Course
- The course is a free, complete series for the CCNA 200-301 certification.
- Viewers are encouraged to subscribe, like, comment, and share the videos to support the series.
Understanding Network Traffic with Packet Tracer
Overview of the Network Diagram
- The lab involves examining network traffic using Packet Tracer's simulation mode.
- The network consists of two routers (R1 and R2), two switches (SW1 and SW2), one server, and one PC.
Interface Types and Speeds
- Interfaces labeled G (Gigabit Ethernet) operate at 1 Gbps; F (Fast Ethernet) operates at 100 Mbps.
Network Addresses Explained
- Two networks are identified:
- 192.168.1.0/24 includes SRV1, PC1, SW1, SW2, and R1’s G0/0 interface.
- 10.0.0.0/24 connects R1’s G0/1 interface with R2’s G0/0 interface.
Packet Analysis in Simulation Mode
Exploring STP Protocol
- At Device SW2, data type is STP (Spanning Tree Protocol), a Layer 2 protocol crucial for preventing loops in networks.
OSI Model Layers
- STP information resides in Layer 2 headers; encapsulation into an Ethernet frame occurs here.
Layer Information from OSPF Protocol
Understanding OSPF Functionality
- OSPF (Open Shortest Path First), a Layer 3 protocol used for routing decisions across networks.
Layer Information Breakdown
- OSPF includes details from Layers 3 through 1:
- Source IP address and destination IP address are part of Layer 3 information.
DHCP Traffic Generation on PC1
DHCP Process Overview
- DHCP (Dynamic Host Configuration Protocol), a Layer 7 protocol that automatically assigns IP addresses to devices.
Command Prompt Usage
- To release an IP address:
ipconfig /release.
- To renew an IP address:
ipconfig /renew.
Analyzing DHCP Messages
- DHCP messages show information up to Layer 7 but omit layers 5 and 6 due to their combination in TCP/IP model as the application layer.
Conclusion of Lab Session
Summary of Key Learnings
- The lab demonstrated how OSI and TCP/IP models function within a network context.
Encouragement for Further Learning