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OSI Model
Conceptual model that standardizes communications between computers
OSI 7 Layer Model
7. Application
6. Presentation
5. Session
4. Transport
3. Network
2. Data Link
1. Physical
OSI 5 Layer Model
5. Application
4. Transport
3. Network
2. Data Link
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, 1. Physical
OSI Model Advantages
- Scalability
- Modularity
- Flexibility
OSI Model Disadvantages
- Some layers depend on information from other layers, which can violate goal of
layer separation
- One layer may duplicate lower layer functionalities
- Additional overhead caused by abstraction between layers
Interface between the application layer & transport layer
Sockets
Application Layer Protocols
HTTP, SMTP, FTP, DNS, etc.
What does the application layer do?
It is the layer which interacts with the user to provide access to services and data
that is sent/received over a network.
What does the application layer call a packet of data?
Message
Application layer service/interface/protocol
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