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Understanding the Network: A Practical Guide to Internetworking by Martin J. Michael

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UDP

The connectionless transport service of the TCP/IP protocol suite is user datagram protocol (UDP). UDP uses the same port process abstraction that TCP uses. Its function is to provide low-overhead, fast-transport service for ULP data transport. UDP has none of the flow control and data synchronization mechanisms that TCP offers. It processes one packet at a time and offers best-effort delivery service.

The UDP header (see Figure 2.17) is 32 bits long and contains information on the source and destination ports, the packet size, and an optional checksum for applications that require checksum support (BOOTP and DHCP).

Figure 2.17. The UDP header.

Like TCP, UDP has a set of reserved ports used for different application server data exchange ...

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