Question: One of the methods used for framing in the Data Link layer uses special ASCII codes called sentinel codes to indicate the beginning and end

One of the methods used for framing in the Data Link layer uses special ASCII codes called sentinel codes to indicate the beginning and end of the data in a frame. Explain why this can cause a problem when transmitting binary data and describe one technique for avoiding this problem when using sentinel codes.

Explain the hidden node problem for wireless links and describe how IEEE 802.11avoids it.

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