Three-Tier Architecture
Learn why hierarchical network design is needed, how it solves full mesh problems, and how two-tier and three-tier architectures improve scalability.
Small Office Home Office (SOHO)
In this lesson, we will explore the various technologies and devices utilized by Small Office Home Office (SOHO) networks. We focus on the big picture without getting into great detail. The focus of the lesson is to give you an introduction to the different types of networks.
Lab#1.2 - Exploring Data Encapsulation in Cisco CML
Set up a simple Cisco CML lab to explore data encapsulation. Build, configure, and capture traffic to see TCP/IP headers and the 3-way handshake in action.
Lab#1.1 - OSI model in practice
Explore the OSI model in action with Wireshark. Learn how data moves through layers, from MAC and IP to TCP handshakes and HTTP requests.
Load Balancers
Learn what a load balancer is, how it works, and why it improves app availability, performance, and scalability in modern network infrastructures.
Firewalls
Learn how firewalls protect networks using zones, security levels, and stateful inspection to block threats and control trusted traffic flow.
Routers and L3 Switches
Learn how routers and Layer 3 switches connect networks, route IP packets, and enable fast inter-VLAN communication in modern network designs.
Hubs, Bridges and Switches
Learn how Layer 2 network devices evolved from hubs to modern switches, and how they manage traffic, reduce collisions, and scale in enterprise networks.
Endpoints (End Devices)
Learn what end devices (endpoints) are in CCNA. Understand roles, routing, addressing, and security of endpoints to build a strong networking foundation.
Data Link Layer
In this lesson, we examine the 2nd layer of the OSI model, called the Data Link Layer. Its main job is to move data between two devices that are directly connected at the physical layer. It adds framing, error detection, and MAC addressing.