CITS3002 Computer Networks  
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The Data Link Layer

The Data Link Layer provides the following services between the Physical and Network Layers :

  • bundling and unbundling groups of bits into frames for the Physical Layer.
  • throttling the flow of frames between sender and receiver.
  • detecting and correcting "higher-level" transmission errors, such as the sequencing of packets from the Network Layer.

Again, due to the OSI "philosophy", the Data Link Layer in the sender believes it is talking directly to the Data Link Layer in the receiver (a peer-to-peer relationship).

CITS3002 Computer Networks, Lecture 3, Data Link Layer protocols, p1, 11th March 2020.