If you are looking at the osi model protocol stack, what layer is the only layer with both a header and trailer?

Data-link layer

Explanation:Data link layer is the second layer of the OSI(Open system interconnection) that functions by managing the movement of the data/information into physical link. This layer encapsulates both header and trailer.

Header is  the part of data link layer that has the purpose of having control  data and its activities which are added at the start of PDU(protocol data unit)  like addressing .Trailer is the part that serves as containing the information of control which gets attached at the bottom part of the PDU

yes, you are able to connect you phone to wii devices. the most common connection i've seen is between iphone and wii.

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