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TCP/IP provides two protocols that work at the transport layer: TCP and UDP.
TCP provides a highly monitored and reliable transport service, while UDP
provides a simple transport with no error-correcting or flow-control services. It
is also interesting to note that TCP and UDP also provide session layer services,
managing all of the connections between the different hosts. When an
application protocol such as HTTP is used to exchange data between a web
client and a web server, the actual session-management for this exchange is
handled by TCP.
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