What is the process of adding headers and trailers to data as it passes from the upper OSI model layers to the lower layers?

What is the process of adding headers and trailers to data as it passes from the upper OSI model layers to the lower layers?

• A. Decapsulation.
• B. Encapsulation.
• C. Encryption.
• D. Decryption.

Answer: (B)

The process of adding headers and trailers to data as it moves from the upper layers of the OSI model to the lower ones is referred to as encapsulation. This occurs because each layer of the OSI model has its own specific functions and protocols that require control information to be added to the data being transmitted. When data is passed down from one layer to the layer directly below it, the upper layer data is encapsulated within the layer's protocol data unit (PDU), which includes headers and sometimes trailers. The header typically contains information necessary for the next layer to understand how to handle the data, such as source and destination addresses, sequence numbers, and protocol type. The trailer may include error-checking information, ensuring data integrity. This encapsulation is essential for effective communication across different types of networks and systems. As the data moves down through the layers, it is framed and prepared for transmission, while at the same time retaining the ability for the receiving end to decode and process it properly. Thus, encapsulation is a fundamental concept in communication networks, ensuring that data is transmitted coherently and efficiently across diverse networking structures.

The process of adding headers and trailers to data as it moves from the upper layers of the OSI model to the lower ones is referred to as encapsulation. This occurs because each layer of the OSI model has its own specific functions and protocols that require control information to be added to the data being transmitted.

When data is passed down from one layer to the layer directly below it, the upper layer data is encapsulated within the layer's protocol data unit (PDU), which includes headers and sometimes trailers. The header typically contains information necessary for the next layer to understand how to handle the data, such as source and destination addresses, sequence numbers, and protocol type. The trailer may include error-checking information, ensuring data integrity. This encapsulation is essential for effective communication across different types of networks and systems.

As the data moves down through the layers, it is framed and prepared for transmission, while at the same time retaining the ability for the receiving end to decode and process it properly. Thus, encapsulation is a fundamental concept in communication networks, ensuring that data is transmitted coherently and efficiently across diverse networking structures.