Module 11: Quiz

Question 1

When streaming stored multimedia applications, the user must first download the entire content before it can start playing.

T/F

Answer 1

False

Streaming allows content to start playing before the entire file is downloaded.

Question 2

With streaming stored multimedia applications, the user can pause, fast forward, skip ahead the audio/video.

T/F

Answer 2

True

Streaming applications provide control over playback features.

Question 3

Which of the following applications is the least sensitive to network delays?
* Streaming video
* VoIP
* Interactive games
* File Transfer

Answer 3

File Transfer

File transfers can tolerate delays better than real-time applications.

Question 4

Which of the following applications is the least tolerant to packet losses? Assume there is no packet retransmission.
* Streaming video
* VoIP
* Interactive games
* File Transfer

Answer 4

File Transfer

VoIP requires timely delivery of packets for quality communication.

Question 5

Available bandwidth is one of the QoS metrics for VoIP applications.

T/F

Answer 5

False

Quality of Service (QoS) metrics are crucial for VoIP performance.

Question 6

A longer jitter buffer reduces the number of packets that are discarded because they were received too late, but that adds to the end-to-end delay.

T/F

Answer 6

True

Longer buffers can improve packet delivery but increase latency.

Question 7

A shorter jitter buffer will not add to the end-to-end delay as much, but that can lead to more dropped packets, which reduces the speech quality.

T/F

Answer 7

True

Shorter buffers may improve latency but compromise quality.

Question 8

Which of the following has an impact on packet jitter?
* Encoding delay
* Decoding delay
* The type of multimedia application
* Network conditions such as buffer sizes, queueing delays, network congestion levels

Answer 8

Network conditions such as buffer sizes, queueing delays, network congestion levels

Various factors contribute to packet jitter in multimedia applications.

Question 9

In VoIP applications, we have a harsher definition for packet loss, as we consider a packet to be lost if it never arrives or if it arrives after its scheduled playout.

T/F

Answer 9

True

VoIP defines packet loss strictly to ensure communication quality.

Question 10

With Forward Error Correction, we also transmit redundant data that can be used for reconstructing the stream at the receiver’s side. This approach to error recovery can lead to more bandwidth consumption.

T/F

Answer 10

True

Forward Error Correction improves reliability but increases bandwidth usage.

Question 11

With interleaving, we mix chunks of audio together so we avoid scenarios where consecutive chunks are lost. This approach can lead to increased latency.

T/F

Answer 11

True

Interleaving helps prevent loss but may introduce delays.

Question 12

Which transport-level protocol is preferred for video content delivery?

Answer 12

TCP

UDP is preferred for its low latency in video streaming.

Question 13

Which of the following is a characteristic of a good quality of experience from the user’s perspective?
* High re-buffering
* Low video quality
* Several video quality variations
* Low start up latency

Answer 13

Low start up latency

Quick startup times enhance user experience in video applications.

Question 14

With throughput-based rate adaption, our goal is to have a buffer-filling rate that is greater than the buffer-depletion rate.

T/F

Answer 14

True

Maintaining a positive buffer balance is crucial for smooth playback.

Question 15

With rate-based adaption, when the bandwidth changes rapidly, the player takes some time to converge to the right estimate of the bandwidth, which can lead to overestimation of the future bandwidth.

T/F

Answer 15

True

Rate-based adaptation can cause delays in adjusting to bandwidth changes.