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Network+ Academy

Master computer networking from the ground up and prepare for the CompTIA Network+ (N10-009) exam — OSI, TCP/IP, subnetting, routing, wireless, security, and troubleshooting.

🤖 AI-Powered📚 30 courses👥 100,000+ learners⭐ 4.9 rating
Course Overview

Become Confident With Networks — and Pass Network+

Every connected device, website, and app rides on a network. This track teaches you how those networks actually work, one clear step at a time, and prepares you for the industry-standard CompTIA Network+ (N10-009) exam. No prior experience is assumed — you start with what a network even is and build all the way to subnetting, routing, wireless security, and structured troubleshooting that real technicians use every day.

What You Will Learn

You will master the OSI and TCP/IP models and how data is wrapped and sent as packets, then work through cabling and devices, IPv4 and IPv6 addressing, and subnetting made approachable. You will learn the ports and protocols that power the internet, how DNS and DHCP work, switching with VLANs, routing fundamentals, and wireless networking and its security. Advanced courses cover NAT and network services, cloud and virtual networking, security foundations, common attacks and defenses, VPNs, monitoring with SNMP and syslog, and a complete troubleshooting methodology with the command-line tools every tech relies on.

The Learning Path

Thirty courses progress from A1 to B2. You begin with What a Network Really Is, The OSI Model Made Simple, and The TCP/IP Model in Practice, build the core with IPv4 Addressing Essentials, Subnetting Without Fear, Ports and Common Protocols, and DNS: How Names Become Addresses, then advance through Switching: VLANs and Loop Prevention, Routing Fundamentals, Securing Wireless Networks, and Network Security Foundations, finishing with Troubleshooting Methodology, Command-Line Diagnostic Tools, and Performance and High Availability.

How It Works

Each course is broken into short, focused lessons with clear explanations, real command examples, and a quick quiz to lock in exam-relevant facts. Acronyms are defined the first time they appear, and an AI tutor is on hand whenever a concept needs a second pass — so you build genuine understanding, not just memorized answers.

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How You'll Learn

🎯
Interactive Lessons
Hands-on coding exercises with real-time feedback
🤖
AI Tutor
Get instant help from our AI when you're stuck
💻
Built-in Editor
Write and run code directly in your browser
🏆
Certificate
Earn a certificate when you complete the course
Curriculum

30 Courses

Every course in the Network+ Academy learning path.

01

What a Network Really Is

A14 lessons

Start from zero with a plain-language picture of computer networks. Learn what it means for devices to talk to each other and why networks…

  • What a Computer Network Means
  • Clients, Servers, and Hosts Explained
  • How Data Travels as Packets
  • +1 more
02

The Internet From the Ground Up

A14 lessons

Demystify the internet itself. Learn how billions of devices connect into one global network and what really happens when you open a websit…

  • The Internet as a Network of Networks
  • What Happens When You Visit a Website
  • Internet Service Providers and Backbones
  • +1 more
03

The OSI Model Made Simple

A14 lessonsPRO

Master the seven-layer OSI model — the mental map every network pro uses. Learn each layer in plain terms so you can reason about how netwo…

  • Why a Layered Model Helps
  • The Physical and Data Link Layers
  • The Network and Transport Layers
  • +1 more
04

The TCP/IP Model in Practice

A24 lessonsPRO

Meet the model the internet actually runs on. Learn how TCP/IP maps to real protocols you use every day and how it compares to the OSI laye…

  • The Four TCP/IP Layers Overview
  • Comparing TCP/IP With the OSI Model
  • How Encapsulation Wraps Your Data
  • +1 more
05

Network Types and Sizes

A24 lessonsPRO

Learn how networks are classified by scale and purpose. From the gear in your home to networks spanning continents, know the difference bet…

  • Local Area Networks at Home and Work
  • Wide Area Networks Across Distances
  • Personal and Metropolitan Networks
  • +1 more
06

Network Topologies and Layouts

A24 lessonsPRO

See the shapes networks take. Learn how devices are arranged into stars, meshes, and more — and why the layout affects speed, cost, and rel…

  • Star and Bus Topology Basics
  • Ring and Mesh Topology Designs
  • Physical vs Logical Topology
  • +1 more
07

Copper Cables and Connectors

A24 lessonsPRO

Get hands-on with the wires that carry most network traffic. Learn the copper cable types, their connectors, and how to pick the right one…

  • Twisted Pair Cable Categories
  • RJ45 Connectors and Wiring Standards
  • Straight-Through vs Crossover Cables
  • +1 more
08

Fiber Optics and Media Choices

A24 lessonsPRO

Step into the world of light-based networking. Learn how fiber carries data at incredible speeds and how to choose between copper and fiber…

  • How Fiber Carries Data With Light
  • Single-Mode vs Multimode Fiber
  • Fiber Connectors and Transceivers
  • +1 more
09

Hubs, Switches, and Bridges

A24 lessonsPRO

Meet the devices that build a local network. Learn how switches moved us past noisy hubs and how they forward frames intelligently inside a…

  • Why Hubs Belong to the Past
  • How a Switch Forwards Frames
  • MAC Addresses and the Address Table
  • +1 more
10

Routers, Access Points, and Firewalls

A24 lessonsPRO

Go beyond the LAN with the devices that connect, extend, and protect networks. Learn what routers, wireless access points, and firewalls ea…

  • What a Router Actually Does
  • Access Points and Wireless Coverage
  • Firewalls as Traffic Gatekeepers
  • +1 more
11

IPv4 Addressing Essentials

B14 lessonsPRO

Crack the code behind every connected device. Learn how IPv4 addresses are built, how they're grouped into classes, and how to read them wi…

  • Reading a Dotted-Decimal Address
  • Network Portion vs Host Portion
  • Address Classes and Their Ranges
  • +1 more
12

Subnetting Without Fear

B14 lessonsPRO

Turn subnetting from scary to simple. Learn how subnet masks and CIDR carve a network into smaller pieces, with a clear method you can foll…

  • What a Subnet Mask Does
  • Reading CIDR Slash Notation
  • Counting Hosts in a Subnet
  • +1 more
13

IPv6 and the Next Internet

B14 lessonsPRO

Prepare for the addressing future already here. Learn why IPv4 ran out, how IPv6 fixes it, and how to read and use these longer addresses.

  • Why We Needed IPv6
  • Reading and Shortening IPv6 Addresses
  • IPv6 Address Types and Scopes
  • +1 more
14

Ports and Common Protocols

B14 lessonsPRO

Learn the language devices use to talk. Understand TCP and UDP, the idea of ports, and the everyday protocols every technician must recogni…

  • TCP vs UDP at a Glance
  • What Port Numbers Are For
  • Web and File Transfer Protocols
  • +1 more
15

DNS: How Names Become Addresses

B14 lessonsPRO

Follow the internet's phone book in action. Learn how domain names turn into IP addresses and how to recognize and fix the DNS problems beh…

  • Why DNS Exists
  • Walking Through a DNS Lookup
  • Common DNS Record Types
  • +1 more
16

DHCP and Automatic Addressing

B14 lessonsPRO

Discover how devices get their settings without anyone typing them in. Learn the DHCP process, scopes, and reservations that keep networks…

  • What DHCP Hands Out
  • The DORA Lease Process
  • Scopes, Pools, and Reservations
  • +1 more
17

Switching: VLANs and Loop Prevention

B14 lessonsPRO

Go deeper into the switch. Learn how VLANs split one switch into many logical networks and how spanning tree stops loops from crashing a LA…

  • What a VLAN Is and Why It Helps
  • Access Ports and Trunk Links
  • Why Switching Loops Are Dangerous
  • +1 more
18

Routing Fundamentals

B14 lessonsPRO

Understand how data finds its way across networks. Learn the role of the default gateway, routing tables, and the choice between static and…

  • The Default Gateway's Job
  • Inside the Routing Table
  • Static vs Dynamic Routing
  • +1 more
19

Wireless Networking Basics

B14 lessonsPRO

Cut the cord with confidence. Learn how Wi-Fi works, the alphabet soup of 802.11 standards, and why some channels and bands beat others.

  • How Wi-Fi Sends Data Over Air
  • The 802.11 Standards Explained
  • Frequency Bands and Channels
  • +1 more
20

Securing Wireless Networks

B14 lessonsPRO

Keep your Wi-Fi out of the wrong hands. Learn the encryption standards, authentication methods, and settings that lock down a wireless netw…

  • Why Open Wi-Fi Is Risky
  • From WEP to WPA2 and WPA3
  • Personal vs Enterprise Authentication
  • +1 more
21

NAT and Network Services

B24 lessonsPRO

Discover the clever tricks that let many devices share one public address and how core services keep time, names, and addresses in sync.

  • How NAT Shares One Public IP
  • Port Forwarding and PAT
  • Time and Naming Services
  • +1 more
22

Cloud and Virtual Networking

B24 lessonsPRO

Networking moved to the cloud — so should you. Learn how virtual machines, virtual networks, and cloud models reshape the way networks are…

  • Virtual Machines and Hypervisors
  • Virtual Switches and Networks
  • Public, Private, and Hybrid Cloud
  • +1 more
23

Network Security Foundations

B24 lessonsPRO

Build the security mindset every technician needs. Learn the core ideas of defense in depth, segmentation, and the access controls that gua…

  • The CIA Triad in Networking
  • Defense in Depth and Layered Security
  • Network Segmentation and Zones
  • +1 more
24

Common Attacks and Defenses

B24 lessonsPRO

Know your enemy. Learn the everyday attacks that target networks and the practical defenses that stop them before damage is done.

  • Spoofing and On-Path Attacks
  • Denial-of-Service Attacks
  • Social Engineering and Phishing
  • +1 more
25

VPNs and Remote Access

B24 lessonsPRO

Connect safely from anywhere. Learn how VPNs build private tunnels across the public internet and how remote workers reach the office netwo…

  • What a VPN Tunnel Provides
  • Site-to-Site vs Client VPNs
  • Tunneling and Encryption Protocols
  • +1 more
26

Network Management and Monitoring

B24 lessonsPRO

You can't fix what you can't see. Learn the tools and protocols that watch a network's health, collect logs, and alert you before small iss…

  • Why Monitoring Matters
  • SNMP and Device Health Data
  • Logs, Syslog, and Alerts
  • +1 more
27

Troubleshooting Methodology

B24 lessonsPRO

Stop guessing and start solving. Learn the structured, repeatable troubleshooting process the CompTIA exam expects and real technicians rel…

  • The Structured Troubleshooting Steps
  • Identifying and Defining the Problem
  • Testing Theories and Making a Plan
  • +1 more
28

Command-Line Diagnostic Tools

B24 lessonsPRO

Build a technician's toolkit. Learn the essential command-line tools that test connectivity, trace paths, and reveal a device's network set…

  • Testing Reachability With Ping
  • Mapping the Path With Traceroute
  • Viewing Settings With Ipconfig
  • +1 more
29

Physical and Cabling Troubleshooting

B24 lessonsPRO

Many outages are simply a bad cable. Learn to diagnose physical-layer problems, test wiring, and use the hardware tools that find faults fa…

  • Spotting Physical-Layer Failures
  • Using a Cable Tester and Toner
  • Crosstalk, Attenuation, and Interference
  • +1 more
30

Performance and High Availability

B24 lessonsPRO

Keep networks fast and always on. Learn how redundancy, failover, and quality-of-service keep critical traffic flowing even when things go…

  • Redundancy and Failover Designs
  • Load Balancing Across Servers
  • Quality of Service for Key Traffic
  • +1 more
FAQ

Frequently Asked Questions

Is the Network+ Academy course free?

Yes. You can start the Network+ Academy course for free and complete its interactive lessons at no cost. An optional PRO subscription unlocks advanced AI tools and a shareable certificate.

Do I need prior experience to learn ENGLISH?

No. The course begins with the fundamentals and gradually moves to more advanced topics, so you can start even with no prior ENGLISH experience.

How will I learn ENGLISH on CoddyKit?

You learn by doing. Short interactive lessons pair a clear explanation with a hands-on coding exercise that runs in real time, and a 24/7 AI tutor gives personalized help whenever you get stuck.

Do I get a certificate for completing Network+ Academy?

Yes. PRO learners can take an exam and earn a shareable certificate of completion with a verifiable code for the Network+ Academy course.

Can I learn ENGLISH on my phone?

Yes. CoddyKit is available on the web and as native iOS and Android apps, so you can learn ENGLISH on any device and your progress syncs across them.

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