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Scenarios that Trigger Retransmits
The packet or the response packet was actually dropped by the network. Retransmitting is OK.
The packet was delayed by the network due to congestion. Retransmitting is really Bad.
No response was received because the server is no longer alive. Retransmitting is Bad.
No response was received because the server is congested. The reply is delayed. Retransmitting is really Bad.
No response was received because the packet was silently discarded due to errors. Rare (excluding DOS attacks)
PPT Version