In a table environment, compare and contrast PPDU, PSDU, MPDU, and MSDU, Illustrate where, in the OSI Model, each data unit operates, and what comprises each data unit.
Briefly explain the MAC process and all of the frames that are used during this process. Please include a 100-200 word conclusion, outlining your results. Your study should include a "Works Cited" page and contain internal cites, giving credit to your source.