Understanding the OSI Model
The OSI (Open Systems Interconnection) model is a conceptual framework used to understand network interactions in seven distinct layers. Each layer has specific responsibilities, contributing to the overall communication process in a network.
Role of the Presentation Layer
The correct answer to the question about compression and decompression of data is option 'B', which refers to the Presentation layer. This layer serves as the intermediary between the Application layer and the lower layers.
Key Functions of the Presentation Layer:
- Data Translation: Converts data formats from the Application layer into a common format for the network and vice versa.
- Data Compression: Reduces the size of data to optimize bandwidth usage and speed up transmission. This is essential for efficient data transfer, especially over limited bandwidth connections.
- Data Encryption: Ensures data security by encoding information before it is transmitted, making it accessible only to authorized users.
Why Other Layers Don't Handle Compression?
- Application Layer: Focuses on end-user software applications and does not handle data formatting or compression.
- Session Layer: Manages sessions between applications but does not manipulate the data format or perform compression.
- Transport Layer: Responsible for reliable data transfer and flow control, but it does not deal with how data is presented or compressed.
Conclusion
In summary, the Presentation layer is crucial for data representation, including compression and decompression, ensuring that data is transmitted efficiently and securely across networks. Understanding this layer's role helps in grasping how data communication functions within the OSI model's structure.