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Function Performed by Application
ECN bit marking provides indication to end-system / application that specific traffic level was exceeded for that flow
ECN capable end-systems or applications take the appropriated action to avoid congestion

Example:
Receiving end notifies the transmitting end when congestion has been encountered
If encountered during session setup
The application may not setup the new session
After session was established
Reduce sending rate
Stop sending packets
Or preempt the session
PPT Version