Introducing the Transport Layer
The TCP/IP Internet layer, as you learned in Hour 4, “The Internet Layer,” and Hour 5, “Subnetting,” is full of useful protocols that are effective at providing the necessary addressing information so that data can make its journey across the network. Addressing and routing, however, are only part of the picture. The developers of TCP/IP knew they needed another layer above the Internet layer that would cooperate with IP by providing additional necessary features. Specifically, they wanted the Transport layer protocols to provide the following:
An interface for network applications— that is, a way for applications to access the network. The designers wanted to be able to target data not just to a destination computer, ...
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