Which three message types for RTCP are valid? (Choose three.)
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A. B. C. D. E. F.ABC.
RTCP (Real-Time Control Protocol) is used in conjunction with RTP (Real-Time Transport Protocol) to monitor the quality of service (QoS) of a media stream in real-time. RTCP allows participants to exchange information about transmission quality, such as packet loss and delay, to improve the overall user experience. RTCP messages are typically sent periodically in small intervals, known as RTCP report intervals, and can contain various message types.
The three valid message types for RTCP are:
A. Sender Report (SR): The Sender Report is sent by the sender of the media stream and contains information about the current state of the media stream, such as the timestamp of the last packet sent and the number of packets sent.
C. Source Description (SDES): The Source Description message is used to provide additional information about the sender of the media stream, such as their name or email address. This message is optional and may not be included in every RTCP packet.
E. Receiver Report (RR): The Receiver Report is sent by the receiver of the media stream and provides feedback to the sender about the quality of the media stream, such as the number of packets received, the number of packets lost, and the round-trip time (RTT) of the packets.
The other options in the question are not valid message types for RTCP:
B. End of Participation (EOP): There is no message type called End of Participation in RTCP.
D. Sender Codec (SC): There is no message type called Sender Codec in RTCP.
F. Average MOS (AMOS): There is no message type called Average MOS in RTCP.
In summary, the three valid message types for RTCP are Sender Report (SR), Source Description (SDES), and Receiver Report (RR).