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Routing TCP/IP, Volume 1, 2/e by Jennifer Carroll Jeff Doyle

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Chapter 3. Static Routing

An important observation from Chapter 1, “TCP/IP Review,” is that 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.

Further, Chapter 1 showed that for communications to take place across a physical path, certain information about ...

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