Welcome to the Ethernet Fundamentals course — the next step in mastering how networks actually work. Ethernet is the backbone of modern LANs, and understanding it deeply is essential for any network engineer. In this course, you’ll explore how Ethernet functions from both the physical and data link layers, how switches make forwarding decisions, and how VLANs keep enterprise networks organized and secure.
With clear explanations, visual examples, and hands-on labs, you’ll learn everything from cabling and collision domains to VLAN trunking and inter-VLAN routing. This course turns Ethernet from a simple “cable technology” into a foundation for real-world enterprise networking.
About
The Ethernet Fundamentals course helps you understand how local networks are built and how Ethernet makes communication possible inside an enterprise LAN. You’ll study Ethernet frames, MAC addresses, switching logic, and VLAN operations in detail.
Each section builds on the last, starting from the physical media and data link concepts, then progressing into switching, VLANs, VTP, and ARP. You’ll also learn how these technologies interact and how to verify them on Cisco devices using the CLI.
By the end, you’ll be able to design and troubleshoot Ethernet-based LANs confidently — a key step toward becoming a Cisco-certified network professional.
What you'll learn
- Understand Ethernet at every layer: Learn about the physical and data link layers, frame structure, and Ethernet standards.
- Master LAN switching logic: See how switches forward traffic, avoid loops, and handle redundant links.
- Configure VLANs and trunks: Segment traffic, create VLAN trunks, and route between VLANs using Cisco routers and switches.
- Explore ARP and address mapping: Understand how devices find each other on the network and how ARP operates behind the scenes.
- Work with real hardware and simulations: Practice your skills using lab topologies in CML or EVE-NG.
Skills you'll gain
Who is this for?
Ideal for CCNA students and entry-level network engineers who want a solid understanding of how Ethernet and VLANs work in real networks. Basic networking knowledge is recommended before starting this course.
Course Info
- Learning Path: CCNA Enterprise Infrastructure
- Exam: 200-301 CCNA v1.1
- Prerequisites: Basic understanding of Network Fundamentals
- Number of lessons: 25+
- Number of diagrams: 200+
- Created: 17 Oct 2025
- Updated: 17 Oct 2025
Course Structure
The course is divided into five main sections: Ethernet Protocol Fundamentals, LAN Switching Fundamentals, Ethernet VLANs, VTP, and ARP. Each section contains multiple lessons, practical labs, and quizzes that help reinforce what you’ve learned.
You’ll learn step-by-step, connecting theory with real configuration examples on Cisco devices. By the end, you’ll be ready to apply these concepts in your lab or production environment.
Outcomes
After finishing this course, you’ll understand how Ethernet works from the ground up. You’ll be able to explain collision and broadcast domains, configure VLANs and trunks, and use ARP to troubleshoot connectivity.
You’ll gain the skills needed to build and manage enterprise LANs confidently, preparing you for more advanced CCNA topics like Spanning Tree Protocol, Layer 3 Switching, and Network Security.
