Data encapsulation is the process where data moving down the protocol stack is wrapped with protocol information at each layer. As application data passes to the transport layer, a TCP 或者 UDP header is added. This segment is then passed to the internet layer, where an IP header is added to form a packet. Finally, the link layer adds its own header, creating a frame for transmission.
Data encapsulation is a core mechanism that enables the layered architecture of the TCP/IP suite to function. Each layer operates independently, concerned only with its own protocol header. When a sending host prepares data, each layer adds its header containing control information specific to that layer’s function. For example, the TCP header includes port numbers for application identification and sequence numbers for reliability. The IP header includes source and destination IP addresses for routing. The link-layer header (e.g., Ethernet) includes MAC addresses for local delivery. At the receiving host, the process is reversed in a process called de-encapsulation. As the data moves up the stack, each layer strips off its corresponding header, reads the control information, and passes the remaining payload up to the next layer. This modular process ensures that, for instance, the IP layer doesn’t need to know what application generated the data, and the link layer doesn’t need to know the final destination IP address—it only cares about the next hop’s physical address.
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