Transport protocols (described in Chapter 7) are responsible for delivering data
on behalf of applications over an IP network. Different transport-layer protocols
provide different levels of service, ranging from simple datagram dispatch to
guaranteed in-order delivery of data.
The more sophisticated transport protocols include some elements of security
that may be used by applications that do not, themselves, include modules that
offer secure data transfer. This has the advantage of collecting together all security
code in a single place
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