October 1998
Beginner
512 pages
14h 22m
English
Content preview from Windows NT TCP/IP Network Administration
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Transport Layer
The protocol layer just above the Internet Layer is the Host-to-Host Transport Layer. This name is usually shortened to Transport Layer. The two most important protocols in the Transport Layer are Transmission Control Protocol (TCP) and User Datagram Protocol (UDP). TCP provides reliable data delivery service with end-to-end error detection and correction. UDP provides low-overhead, connectionless datagram delivery service. Both protocols deliver data between the Application Layer and the Internet Layer. Applications programmers can choose whichever service is more appropriate for their specific applications.
User Datagram Protocol
The User Datagram Protocol gives application programs direct access to a datagram delivery service, like the delivery service that IP provides. This allows applications to exchange messages over the network with a minimum of protocol overhead.
UDP is an unreliable, connectionless datagram protocol. As noted previously, unreliable merely means that there are no techniques in the protocol for verifying that the data reached the other end of the network correctly. Within your computer, UDP will deliver data correctly. UDP uses 16-bit Source Port and Destination Port numbers in word 1 of the message header, to deliver data to the correct applications process. Figure 1-8 shows the UDP message format.
Figure 1-8. UDP message format
Why do applications ...
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