Data link layer - osi model layer, PHP Web Programming

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It is responsible for transmitting a group of bits among the adjacent nodes. The group of bits is termed as frame. The network layer passes a data unit to the data link layer and data link layer adds the header information to this data unit. The data link layer carry out the following functions:

  • Addressing: Headers & trailers are added containing the physical addresses of the adjacent nodes and eliminated on a successful delivery.
  • Framing: Grouping of/bits attained from the network layer into manageable units called frame
  • Flow control: it is for regulate the amount of data that can be sent to the receiver.
  • Media access control (MAC): this layer is decide who can send data, when and how much.
  • Synchronization: this layer also has bits to synchronize the timing to know the bit interval to identify the bit correctly.
  • Error control: it incorporates the CRC to make sure the correctness of the frame.
  • Node to node delivery: it's also for error-free delivery of the whole frame/packet to the next adjacent node.

 


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