How can lost data be recovered when the data link layer does not use ACK? Withou

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How can lost data be recovered when the data link layer does not use ACK? Without ACK it is impossible to recover lost data. Lost data can be recovered by setting appropriate timeout periods in the data link layer. It can be recovered by a higher layer protocol, which can recognize that data is missing. The higher layer protocol may then trigger its peer entity to resend the data, and the data link layer protocol will know that it is repeated data. It can be recovered by a higher layer protocol, which can recognize that data is missing. The higher layer protocol may then trigger its peer entity to resend the data. The data link layer protocol, however, will not know that it is repeated data, it will treat it as new.

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