In this lesson, we examine the 4th layer of the OSI model called the Transport Layer. There are a few protocols that operate at the Transport layer. However, by far the most widely used ones are TCP and UDP.

In this lesson, we examine the top three layers of the OSI model, layers 5, 6, and 7, called the Application, Presentation, and Session.

In this lesson, we explain what the OSI model is in an easy and understandable language. It is one of the most important concepts in networking, so we break it down into pieces to help you understand exactly what its purpose is.

This lesson continues our exploration of TCP/IP protocols that are important in the context of Access Control Lists (ACLs). It explores the most common use of the Internet: browsing the World Wide Web (www).

This lesson begins our discussions on the fundamentals of Layer 4 (Transport Layer) and Layer 7 (Application Layer) protocols. This knowledge will serve you as a context required to understand how Access Control Lists (ACLs) work.

Troubleshooting is one of the hardest parts of networking, especially in real environments. The truth is, you can't fully learn how to troubleshoot just by reading books or watching a video tutorial. It takes hands-on practice and real-world experience.

This is the final configuration lab, designed to check whether you have understood all the Spanning Tree concepts we have covered in the course. If you complete all configuration tasks correctly, you are fully ready for the Spanning Tree portion of the CCNA exam.