Network Security Basics
Learners will understand how data travels through a network, how to defend against malicious traffic, and how to configure a basic firewall.
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Key Concepts
Review core concepts you need to learn to master this subject
OSI Model
TCP/IP Model
OSI Layers
Network Categories
Network
Network Protocols
Network Segmentation
Access Points
OSI Model
OSI Model
The OSI Model is a conceptual, implementation-neutral model that describes networking in seven separate layers, where each layer covers a set of functions and tasks.
This model helps us communicate while we do network troubleshooting and architecture.
Network Basics
Lesson 1 of 1
- 1What happens when we access Codecademy? How are we able to access the content provided by this course? Networking! Your device uses a network connection and goes through a series of defined networ…
- 2When we talk about a network, that could be anything connecting two or more devices. It’s important we understand the different types of networks. Networks are broken into different subsets based…
- 3The OSI (Open Systems Interconnection) Model was developed in the 1970s and 1980s, and it is a conceptual model that breaks networking into seven separate layers. Each layer refers to a set of fu…
- 4### Layer 1 – Physical The Physical, and lowest layer of the model, covers how unstructured data, like bits, is transmitted. Some concrete examples of this are the ways wires are configured, th…
- 5In layers 3 and 4, we begin to see how data is routed between different networks and how transportation protocols function within these layers! ### Layer 3 – Network The Network layer describe…
- 6### Layer 5 – Session When two computers or devices have started an exchange of information, we call that a session. The Session layer in OSI is responsible for opening, closing, and maintain…
- 7The OSI Model isn’t the only model that describes networking. You will hear more often about the TCP/IP model, which is a 4-layered model that makes direct reference to current Internet implemen…
- 8Now that we have a conceptual model of everything it takes for data to travel in a network, let’s talk about some of the most common network protocols we use everyday. What are network protocols? …
- 9The protocols in the last exercise are all involved in everyday Internet activity. Below are some other Application-layer protocols that are more commonly used by IT professionals. — ### SSH _S…
How you'll master it
Stress-test your knowledge with quizzes that help commit syntax to memory
