In Layer 2 devices, networks are viewed as logical topologies. It is responsible for transporting data over a physical link in a reliable manner. It formats the data into frames. Data link specifications include frame sequencing, flow control, synchronization, error notification, topology, and addressing. This layer converts bits into frames upon receiving information from the physical media. It consists of switches and bridges. Due to its complexity, this OSI layer is divided into three sublayers by the IEEE. The logical link sublayer governs communication between devices in the upper layer.
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