UDP Characteristics
Figure 1-28 presents the structure of a UDP segment header. Because UDP is considered to be a connectionless, unreliable protocol, it lacks the sequence numbering, window size, and acknowledgment numbering present in the header of a TCP segment. Rather the UDP segment’s header contains only source and destination port numbers, a UDP checksum (which is an optional field used to detect transmission errors), and the segment length (measured in bytes).
Figure 1-28 UDP Segment Header Format
Because a UDP segment header is so much smaller than a TCP segment header, UDP becomes a good candidate for the transport layer protocol ...
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