1.5-4 What is "encapsulation"? Which of the definitions below describe what is meant by the term "encapsulation"?
Receiving a “packet” from the layer below, extracting the payload field, and after some internal actions possibly delivering that payload to an upper layer protocol.
Determining the name of the destination host, translating that name to an IP address and then placing that value in a packet header field.
Computing the sum of all of the bytes within a packet and placing that value in the packet header field.
Starting a transport layer timer for a transmitted segment, and then if an ACK segment isn’t received before the timeout, placing that segment in a retransmission queue.
Taking data from the layer above, adding header fields appropriate for this layer, and then placing the data in the payload field of the “packet” for that layer.