Packet delay, and packet delay variation, have the greatest impact on which of these service categories?Question 9AnswerNeither streamed nor message/block servicesBoth streamed and message/block servicesStreamed servicesBlock or message services

Which of the following statements is TRUE concerning packet delay variation as it relates to the delivery of streaming media (like audio or video):Question 13AnswerPacket delay variation is not important for audio or video delivery because it only occurs in packet-switched networks, and these are not used for streamed mediaIf packet delay variation occurs, it means that the network is congested and therefore streaming media could not be supportedLarge packet delay variation never impacts on the quality of streamed media because a buffer can be used to smooth it outPacket delay variation is a bigger problem for communicative services (like a videophone call) than for retrieval services (like Netflix)

Information transfers over networks are sometimes categorised into block/message services or streaming services. What category of service is video?Question 11Select one:It depends on whether the video is downloaded before play, or decoded and displayed as it is being receivedNeither a message nor streaming serviceA streaming serviceA message or block service

Processing Delay, Queuing Delay, Transmission Delay, Propagation Delay, Throughput and Loss

Which of the following statements is/are true concerning carriage of streaming services over networks?Question 2Select one or more:Streaming services may be carried over circuit-switched, packet-switched or virtual circuit switched networksStreaming services can only be carried in packet form if the network provides virtual circuit switchingStreaming services require separate network infrastructure; they cannot be carried over the same network as bursty data servicesStreaming services generate bits continuously and so cannot be carried over packet switched networks

Which of he following statements is NOT true concerning streaming of video or audio over the Internet?Question 6AnswerAdaptive streaming requires that there should be multiple encoded versions of the same content available from the serverStreaming is characterised by the need to continuously receive, decode and render (or "play") a segment of the media within a fixed deadlineThe need to accommodate packet delay variation and packet loss can mean a long delay in the receiver due to bufferingProgressive Download requires the whole media file to be downloaded before playback can begin