link_layer

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North Carolina State University *

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401

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Information Systems

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Oct 30, 2023

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Data Link Layer The Data Link Layer handles the reliable transmission of frames between devices on the same local network segment. This layer is sub-divided into two sublayers: the Logical Link Control (LLC) and the Media Access Control (MAC). While the LLC is concerned with flow control and reliability, the MAC sublayer focuses on frame addressing and media access control. This is the layer where each Ethernet device gets its own unique MAC address, which helps in directing frames of data to specific devices on a local network. Techniques like error detection and error recovery are also implemented at this layer, usually through checksums or Cyclic Redundancy Checks (CRC), ensuring that frames are transmitted reliably.
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