7. (15 pt.) As network access layer in the Internet architecture actually corresponds to data link layer together with p

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7. (15 pt.) As network access layer in the Internet architectureactually corresponds to data link layertogether with physical layer in OSI reference model, we mayalternatively use five-layerarchitecture to describe the organization of network system. Showthe functionalities of these fivelayers, and what layers should be involved at end hosts, layer 2switches, and routes?