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Exam : Nortel 920-803 Title : Nortel technology standards and protocol for ip telephony solutions 1. The basic attributes of Real-Time Protocol (RTP) provide for support of applications like voice and video. Which three attributes of RTP support real-time applications? (Choose three.) A. Timestamping B. Packet sequencing C. Header compression D. Payload identification E. Packet retransmission Answer: ABD 2. A video conference is in progress between two networked locations using gigabit Ethernet. The video conferencing application is using User Datagram Protocol (UDP) to transport the video and audio data. Why should UDP be used instead of Transmission Control Protocol (TCP)? A. TCP CANNOT handle streaming data applications. B. UDP is better than TCP at seamlessly synchronizing voice and video together. C. UDP serves as an efficient transport for handling real-time application traffic. D. UDP uses less bandwidth than TCP in a WAN, but more bandwidth than TCP in a LAN. Answer: C 3. How does Real-Time Control Protocol (RTCP), the control protocol of Real-Time Protocol (RTP), assist RTP in handling packetized voice in an IP telephony environment? A. Controls the RTP data flows. B. Identifies sources and provides QoS feedback. C. Interoperates with Transmission Control Protocol (TCP). D. Controls the network bandwidth used by RTP data flows. Answer: B
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