Primary functions provided by Layer 2 data encapsulation include data link layer addressing, and the detection of errors via cyclic redundancy check calculations. An additional function is delimiting groups of bits into frames.
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encapsulation
source and destination port number or two applications communicating the data
MAC provides physical addressing. The BIA (Burn In Address) which is stored in RAM when the computer boots up is added to each frame that is created as the source mac address. But to answer your question, the MAC layer does the following: Data Encapsulation and Media Access Control.
the network layer --> check your question. ^^^^^^^^^^^^^^^^^^^^^^^^^^^ That is totally not the right answer, how about you actually read the book for the course. It is the data link layer that does encapsulation. I agree - its the Data Link Layer which encapsulates the Network layer...NOT the Network Layer.
7 - application