Ch2_data_link_layer-2008-1

Ch2_data_link_layer-2008-1 - DATA LINK LAYER Sunghyun Choi...

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DATA LINK LAYER Sunghyun Choi Adopted from Prof. Saewoong Bahk’s material
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Data Link Layer: Introduction Efficient communication between two adjacent machines Providing a well defined service interface to the network layer Framing Error control (providing error-free channel) Flow control Medium access control (MAC) for broadcast channel
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Services for the Network Layer Unacknowledged connectionless service No connection establishment No attempt to recover a frame Appropriate for low error-rate links Acknowledged connectionless service No connection establishment Each frame sent is individually acknowledged If ACK has not arrived within a specified time interval, it can be sent again
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Useful for unreliable channels Acknowledged connection-oriented service Connection establishment Each frame over the connection is numbered and acknowledged Frame order conservation
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Error detection and correction Extra bits must be appended to a frame to detect errors (redundancy) Single Parity Check simplest a single bit , “parity check” appended This parity check bit is 1 if the number of 1’s in
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Ch2_data_link_layer-2008-1 - DATA LINK LAYER Sunghyun Choi...

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