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How is congestion avoided when using UDP?

In addition to Steffen's fine answer perhaps more direct replies: how applications can determine: How many UDP datagrams can be sent at once They can't. Neither IP nor UDP provide any mechanism to ...
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How is congestion avoided when using UDP?

UDP does not provide any congestion control, control of packet loss, duplication, reordering ... . All of this has to be implemented at the application level and each protocol might handle this ...
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