At which OSI layer is data added to a PDU during the encapsulation process?
- application layer
- data link layer
- network layer
- transport layer
Answers Explanation & Hints: The data that needs to be transmitted is added to a Protocol Data Unit (PDU) at the Application layer during the encapsulation process. The Application layer is the top layer of the OSI (Open Systems Interconnection) model and it provides interfaces for application-level protocols. The data is then passed down to the lower layers of the model for further encapsulation and eventual transmission over the network. The Data Link layer is responsible for data framing and error detection, while the Network layer is responsible for routing and forwarding data between different networks. The Transport layer provides end-to-end data transport services.