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===Layer 2: data link layer===
The [[data link layer]] provides a [[reliability (computer networking)|reliable]] link between two directly connected nodes, by detecting and possibly correcting errors that may occur in the physical layer.
The data link layer is divided into two sublayers:ok
* [[Media Access Control]] (MAC) layer - responsible for controlling how computers in the network gain access to data and permission to transmit it.
* [[Logical Link Control]] (LLC) layer - control error checking and packet synchronization.
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