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School/Analyse/OSI Model.md
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@ -12,6 +12,20 @@ As you can see the model has 7 layers. Each layer has their own responsibility.
**Note: We don't actually "use" the OSI model, we mostly use the [[TCP/IP Model]] now. The implementation is exactly the same, only some layers are different.** **Note: We don't actually "use" the OSI model, we mostly use the [[TCP/IP Model]] now. The implementation is exactly the same, only some layers are different.**
## 7. Application Layer ## 7. Application Layer
The application Layer provides services to the end user. So this is the layer the user actually interacts with.
These services are usually protocols that interact with the data that the user uses.
**Examples of services (protocols):**
- HTTP
- FTP
- IRC
- SSH
- DNS
- SMTP
For example a web browser like Google Chrome uses the HTTP protocol to browse files on the internet. And the mail client Outlook uses the SMTP protocol to send mail via the internet.
## 6. Presentation Layer ## 6. Presentation Layer
## 5. Session Layer ## 5. Session Layer
## 4. Transport Layer ## 4. Transport Layer