![]() Consequently, UDP's service is unreliable. ![]() UDP uses a simple transmission model that doesn't include handshaking dialogues to provide reliability, ordering or data integrity. If an application doesn't receive a reply within a certain time frame, the application sends the packet again, or it stops trying. ![]() Most applications wait for any replies they expect to receive as a result of packets sent using UDP. Rather, it sends the data out and relies on the devices in between the sending and receiving computers to correctly get the data where it's supposed to go. This means UDP doesn't connect to the receiving computer directly, which TCP does. Unlike TCP, UDP doesn't guarantee the packets will get to the right destinations. After UDP packets are encapsulated in an IP packet, they're sent off to their destinations. This data consists of the source and destination ports on which to communicate, the packet length and a checksum. UDP works by gathering data in a UDP packet and adding its own header information to the packet. UDP uses IP to get a datagram from one computer to another. The composition of the four UDP header fields: source port, destination port, UDP length and checksum checksum, which is used in error checking - its use is required in IPv6 and optional in IPv4.length, the length in bytes of the UDP header and any encapsulated data and. ![]()
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