involves the process of adding a header and a tail to a data payload to form a new packet. A. Decapsulation B. Routing C. Switching D. Encapsulation

Analyzing the Question

To determine which process is described, let's break down the terms provided in the options:

1. Decapsulation: This is the process of removing the header and tail from a packet to retrieve the original data payload. This is typically used when data is received.

2. Routing: This refers to the process of determining the path for data to travel across networks. It does not involve adding headers or tails to packets.

3. Switching: This pertains to the process of forwarding packets through a network switch. This can involve various methods but is not specifically about adding headers and tails.

4. Encapsulation: This is the process of adding a header and a tail to a data payload to form a new packet. This generally occurs when data is being prepared for transmission over a network.

Conclusion

Given the definitions above, the correct process that involves adding a header and a tail to a data payload is:

Final Answer

D. Encapsulation