Many real-time video applications run over UDP rather than TCP because they cannot tolerate retransmission delays. However, this means video applications are not constrained by TCP’s congestion-control algorithm. What impact does this have on TCP traffic? Be specific about the consequences

Video applications typically run over UDP rather than TCP because they cannot tolerate  Re-transmission delays. However, this means video applications are not constrained by  TCP’s congestion control algorithms.

(a). What impact does this have on TCP traffic? Be specific about the consequences.

Fortunately, these video applications often use RTP, which results in RTCP “receiver  reports” being sent from the sink back to the source. These reports are sent periodically  (e.g. once a second) and include the percentage of packets successfully received in the  last reporting period.  

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explanation:

it can either be 2. or 4. : ) tell me if i'm wrong or right