from routing tcpip, jeff doyle...
the data link/physical layers and the transport/network layers, as defined by the OSI model, perform very similar duties: They provide the means for conveying data from a source to a destination across some path. The difference is that the data link/physical layers provide communications across a physical path, whereas the transport/network layers provide communications across a logical or virtual path made up of a series of data links.
network cisco ccna gns3 certification arteq
a network runs through it
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