Professor Messer’s CompTIA N10-009 Network+ Training Course

This is the index to my free CompTIA N10-009 Network+ training course videos.
All of my training videos are completely free; watch them online right now!


Click here to see how you can own a comprehensive course summary with my 70-page printed or downloadable PDF Course Notes.


31 Videos – Total Run Time (so far): 4 hours, 45 minutes

This course is in active production and new videos are added all the time.
Click here to subscribe to the Professor Messer YouTube channel and get real-time updates.


Section 0: The N10-009 CompTIA Network+ Exam

0.1 – Introduction

How to Pass Your N10-009 Network+ Exam (7:30)

The CompTIA Network+ certification is one of the most popular entry-level networking certifications in the information technology industry. In this video, you’ll learn about the N10-009 edition and how to best prepare for your Network+ studies.


Section 1: Networking Concepts

1.1 – The OSI Model

Understanding the OSI Model (13:51)

IT professionals use the OSI model as a common way to describe network operations. In this video, you’ll learn about the OSI model and how each layer of the model can be applied to practical networking.

1.2 – Network Appliances and Applications

Networking Devices (14:31)

Our modern networks consist of many different devices working together. In this video, you’ll learn about switches, routers, firewalls, access points, and more.

Networking Functions (13:25)

It takes many different protocols to provide network services. In this video, you’ll learn about VPNs, CDNs, QoS, IP, and other protocols.

1.3 – The Cloud

Designing the Cloud (9:49)

Designing a cloud-based network includes a number of technical challenges. In this video, you’ll learn about network function virtualization, VPC endpoints, network security lists and groups, and much more.

Cloud Models (5:23)

Not all clouds are the same. In this video, you’ll learn about the differences between SaaS, PaaS, and IaaS.

1.4 – Ports and Protocols

Introduction to IP (14:10)

Understanding the fundamentals of IP are important for overall understanding of our modern network. In this video, you’ll learn how IP is used to move data across the world.

Common Ports (20:22)

Port numbers can help provide identification and management of application traffic. In this video, you’ll learn about well-known port numbers for popular applications.

Other Useful Protocols (8:26)

We rely on many different protocols to manage and connect our network devices. In this video, you’ll learn about ICMP, GRE, and IPsec protocols.

Network Communication (3:55)

Communication between network devices can occur in different ways. In this video, you’ll learn the difference between unicasts, multicasts, anycasts, and broadcasts.

1.5 – Transmission Media

Wireless Networking (6:36)

We use many different wireless standards in the IT industry. In this video, you’ll learn about 802.11 wireless networks, 4G, 5G, and satellite networking.

Ethernet Standards (4:04)

Every Ethernet device in the world can communicate with every other Ethernet device, thanks to the international standards. In this video, you’ll learn how Ethernet standards are created and updated.

Optical Fiber (3:55)

If you are networking over an extended distance, you’re probably using optical fiber. In this video, you’ll learn about multimode and single mode optical fiber technologies.

Copper Cabling (7:21)

There are many different copper cable types used in modern networks. In this video, you’ll learn about twisted pair cable, coax, and the importance of plenum-rated copper cables.

Network Transceivers (4:51)

Transceivers are used to provide a modular networking environment. In this video, you’ll learn about Ethernet transceivers and the differences between SFP, SFP+, QSFP, and QSFP+.

Fiber Connectors (3:56)

There are many different ways to connect optical fiber devices. In this video, you’ll learn about LC, SC, ST, and MPO fiber connectors.

Copper Connectors (3:31)

Not every copper connection is the same. In this video, you’ll learn about RJ11, RJ45, F-connectors, and BNC copper connectors.

1.6 – Network Topologies

Network Topologies (4:42)

We often use broad descriptions when describing network topologies. In this video, you’ll learn about star, mesh, hybrid, spine and leaf, and other network topology types.

Network Architectures (4:53)

Many networks are built using well-established design criteria. In this video, you’ll learn about three-tier architectures, collapsed core designs, and traffic flow in a data center.

1.7 – IPv4 Addressing

Binary Math (9:15)

If you’re calculating IP subnets, it will be useful to understand the basics of binary math. In this video, you’ll learn how to convert between decimal and binary IP addresses.

IPv4 Addressing (11:06)

IPv4 is one of the most popular protocols in the world. In this video, you’ll learn about the fundamentals of IPv4 addressing, automatic IP addressing, and the difference between public and private IP addresses.

Classful Subnetting (10:58)

We’ve designed IPv4 to support nearly any network size. In this video, you’ll learn the fundamentals of IPv4 subnetting and how network classes are used as a starting point for IP subnetting.

IPv4 Subnet Masks (9:00)

The transition to variable length subnet masks provides efficiency and flexibility with IP addressing. In this video, you’ll learn about classless subnetting and CIDR-block notation.

Calculating IPv4 Subnets and Hosts (9:46)

Understanding how to subnet using variable length subnet masks are important for any network administrator. In this video, you’ll learn how to use variable length subnet masks to segment a network into smaller IP subnets.

Magic Number Subnetting (21:09)

There are many different shortcuts that network administrators use to quickly calculate IP subnet information. In this video, you’ll learn about the magic number method of IP subnetting.

Seven Second Subnetting (17:03)

Some network administrators need to subnet quickly with a minimal amount of math. In this video, you’ll learn about the seven second subnetting shortcut for IP subnetting.

1.8 – Network Environments

Software Defined Networking (6:56)

Software defined networking provides a number of advantages over traditional networking. In this video, you’ll learn about the fundamentals of software defined networking and how SD-WAN can be used to optimize cloud-based application traffic.

Virtual Extensible LAN (5:17)

Virtual Extensible LAN is designed for large-scale service providers and data centers. In this video, you’ll learn about VXLAN and how a virtual extensible LAN design can scale to millions of virtual networks.

Zero Trust (6:41)

Many networks are relatively open on the inside. In this video, you’ll learn about zero trust, policy-based authentication, least privilege, Secure Access Service Edge, and more.

Infrastructure as Code (8:20)

Describing a network design as code can provide flexibility for design and deployment of cloud-based infrastructures. In this video, you’ll learn about playbooks, automation use cases, and source code control.

IPv6 Addressing (13:50)

IPv6 is the next generation of IP addressing. In this video, you’ll learn about IPv6 addresses and methods of connecting IPv4 and IPv6 networks using tunneling, dual-stack routing, and NAT64.


This course is in active production and new videos are added all the time.
Click here to subscribe to the Professor Messer YouTube channel and get real-time updates.