FSNE: Core Protocols & Network Models


In this module, we dive into the most fundamental and foundational concepts related to IT and networking. You’ll learn what computer networks are all about and by the end of this module you will have an understanding of all the important protocols, standards, and technologies that give you a strong IT foundation.


  • Welcome (1 min)
    • Welcome to the Core Protocols & Network Models Module!
TCP, UDP, & Ports - 66 minutes
  • Ports (15 min)
    • What are TCP and UDP Ports? We’ve got to understand these before we can truly understand the TCP and UDP protocols themselves.
  • TCP (10 min)
    • Good old Transmission Control Protocol!
  • UDP (5 min)
    • And, we must not forget about User Datagram Protocol.
  • Real World TCP (29 min)
    • Now, let’s look at some actual TCP ports using the netstat command.
  • Port Forwarding (7 min)
    • Port Forwarding – so useful, yet so dangerous!
Core Protocols - 31 minutes
  • The Domain Name System (14 min)
    • In this lesson we will break down the Domain Name System and you will finally understand why websites are named the way they are named.
  • Diagram of a DNS Request (6 min)
    • And now let’s check out a diagram of just what happens with DNS Requests.
  • Core Protocols (11 min)
    • There’s a few protocols that we need to make sure you completely understand. Let’s get down with some Telnet, SSH, ICMP, FTP and TFTP!
Networking Models - 60 minutes
  • Intro to OSI and the 7 Layers (12 min)
    • We’ll begin breaking down the OSI model by learning about the 7 layers.
  • Passing Through the Layers (5 min)
    • Now that we know what the 7 layers are we can see how data looks as it moves through each layer of the OSI model.
  • Devices and Protocols in OSI (16 min)
    • In this lesson we will look at the OSI model from the perspective of different network devices and the layers at which they function.
  • Remembering the Layers (4 min)
    • We’ll wrap up the lessons on the OSI model with some ways to remember the layers from bottom to top and top to bottom.
  • The TCP/IP Model (14 min)
    • Now that we understand OSI we can quickly deconstruct the TCP/IP Model
  • Client-Server & Peer-to-Peer (9 min)
    • In this lesson we will learn about the age old networking terms client-server and peer-to-peer


Guidance and Motivation


The program is created by engineering veterans who worked at Cisco, Arista Networks, top VARs, and in the U.S. Air Force. The founders have trained over 1000+ engineers for the military and built this curriculum from the ground up in order to make you job and mission-ready!

Over 40+ years of combined industry experience have been poured out into our Full Stack Network Engineering program to take anyone from Zero to Engineer in 14 to 24 weeks.

Terry Kim

Founder and CEO of NexGenT – I’ve worked in the IT industry for 15+ years before starting this company and have been fortunate enough to work for some amazing companies such as Cisco Systems, Arista Networks, and Dimension Data as a Network Architect/Systems Engineer. And my mission is to help you level up in Information Technology!

Jacob Hess

I’m a Network Engineer, Entrepreneur, and Air Force veteran who is passionate about computer networking, education, and high performance teams. I enjoy people, teaching, learning, business, and cutting edge technology.

Bill Goodwin

20 years in the computer networking industry that has included campus enterprise and Service Provider backbone support.  Headed up the problem management team overseeing troubleshooting for all high profile issues at AT&T.  Began teaching Cisco networking as a Cisco Netacad Instructor in 2007.  My focus is to get students CCNA certified.

John Meersma

I am a Network, Collaboration, and Automation Engineer with a passion for helping others become their technical best. I have worked with and taught technology for over twenty years. Learning Cisco and becoming certified change my life. I am committed to helping others do the same.