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? The answer to this question is simple. Networking! However, the actual processes behind 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
