APS – Level 01 Networking : CCNA As we saw in the first course, the physical layer is responsible for turning the data frame into stream of bits suitable for the transmission medium (Copper, Fiber, or electromagnetic waves...). In other words, the OSI...
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APS – Level 01 Networking : CCNA As we saw in the first course, the physical layer is responsible for turning the data frame into stream of bits suitable for the transmission medium (Copper, Fiber, or electromagnetic waves...). In other words, the OSI Physical layer manages and synchronizes the electrical or analog pulses that form the actual transmission. On the receiving end, the Physical layer reassembles these pulses into a data frame at the layer 2 : data link layer Sender Receiver 7 7 6 6 5 5 4 4 3 3 2 2 1 Physical 1 Physical Transmission medium Layer 2 : Data link layer Introduction In the OSI Model, just above the Physical layer, comes the Layer 2 : The Data link layer this layer controls the communication between devices which are on the immediate link (it maintains logical links for the subnet – more explanation will be given as we move forward -) For example ; Those two pc’s are on the same subnet, the communication between them is controlled by the data link layer (layer 2)
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