Discussion
In the layer hierarchy as the data packet moves from the upper to the lower layers, headers are:
Answer: A
Correct answer: Added
Each layer, as the data passes down the stack, prepends its own header containing the information its peer at the far end needs - the transport layer adds ports and sequence numbers, the network layer addresses, the data link layer MAC addresses and a trailing checksum. This is encapsulation. At the receiver the process runs in reverse: each layer strips its own header and passes the remainder up, which is decapsulation.
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