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{"ops":[{"insert":"Despite being adjacent in a protocol stack, Data Link Layer protocols\u00a0"},{"attributes":{"italic":true},"insert":"and"},{"insert":"\u00a0Network Layer protocols each employ a number of similar fields in their headers (i.e. a field named 'X' appears in the headers of both layers, and the role of 'X' is similar for both layers).\n\nFor each of these three fields:\na. describe its typical role, and\nb. provide an example to demonstrate why their 'duplication' does not introduce unnecessary redundancy.\n\n"}]}
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