Florida Gulf Coast University

GEB 3250

Chapter 25 Quiz

1)We can divide audio and video services into                                broad categories.

1. three
2. two
3. four
4. none of the above

2. )                       audio/video refers to on-demand requests for compressed audio/video files.

1. Streaming live
2. Streaming stored
3. Interactive
4. none of the above

3. )                               audio/video refers to the broadcasting of radio and TV programs through the Internet.

1. Interactive
2. Streaming live
3. Streaming stored
4. none of the above

4. )                         audio/video refers to the use of the Internet for interactive audio/video applications.

1. Interactive
2. Streaming live
3. Streaming stored
4. none of the above

5. )According to the Nyquist theorem, we need to sample an analog signal                                    times the highest

frequency.

1. three
2. two
3. four
4. none of the above

6. )In         encoding, the differences between the samples are encoded instead of encoding all the sampled

values.

1. predictive
2. perceptual
3. both a and b
4. none of the above

7. )            encoding is based on the science of psychoacoustics, which is the study of how people perceive

sound.

1. Predictive
2. Perceptual
3. both a and b
4. none of the above

8. )                                 is used to compress images.

1. MPEG
2. JPEG

3. either a or b
4. none of the above

9. )                                 is used to compress video.

1. MPEG
2. JPEG
3. either a or b
4. none of the above

10. )The first phase of JPEG is                                        .

1. DCT transformation
2. quantization
3. data compression
4. none of the above

11. )The second phase of JPEG is                                       .

1. DCT transformation
2. quantization
3. data compression
4. none of the above

12. )The third phase of JPEG is                                        .

1. DCT transformation
2. quantization
3. data compression
4. none of the above

13. )Jitter is introduced in real-time data by the                                                       .

1. error caused during transmission
2. delay between packets
3. both a and b
4. none of the above

14. )To prevent                            , we can timestamp the packets and separate the arrival time from the

playback time.

1. error
2. jitter
3. either a or b
4. none of the above

15. )A                       buffer is required for real-time traffic.

1. playback
2. reordering
3. sorting
4. none of the above

16. )A                             on each packet is required for real-time traffic.

1. timestamp
2. sequence number
3. both a and b
4. none of the above

17. )Real-time traffic needs the support of                                           .

1. broadcasting

2. multicasting
3. both a and b
4. none of the above

18. )                            means changing the encoding of a payload to a lower quality to match the bandwidth of

the receiving network.

1. Translation
2. Mixing
3. both a and b
4. none of the above

19. )                            means combining several streams of traffic into one stream.

1. Translation
2. Mixing
3. both a and b
4. none of the above

20. )                         is not suitable for interactive multimedia traffic because it retransmits packets in case of

errors.

1. UDP
2. TCP
3. both a and b
4. none of the above

21. )                            is the protocol designed to handle real-time traffic on the Internet.

1. TCP
2. UDP
3. RTP
4. none of the above

22. )RTP uses a temporary even-numbered                              port.

1. UDP
2. TCP
3. both a and b
4. none of the above

23. )                               is a protocol for controlling the flow and quality of data.

1. RTP
2. RTCP
3. UDP
4. none of the above

24. )RTCP uses an odd-numbered                             port number that follows the port number selected for RTP.

1. UDP
2. TCP
3. both a and b
4. none of the above

25. )                               is an application protocol that establishes, manages, and terminates a multimedia

session

1. RIP
2. SIP
3. DIP
4. none of the above

26. )                    is a standard to allow telephones on the public telephone network to talk to computers

connected to the Internet.

A) SIP

B) H.323

C) Q.991

D) none of the above

27. )A real-time video performance lasts 10 min. If there is jitter in the system, the viewer spends         

minutes watching the performance.

1. less than 10
2. more than 10
3. exactly 10
4. none of the above

28. )A                      shows the time a packet was produced relative to the first or previous packet.

1. timestamp
2. playback buffer
3. sequence number
4. none of the above

29. )                    are used to number the packets of a real-time transmission.

1. Timestamps
2. Playback buffers
3. Sequence numbers
4. none of the above

30. )In a real-time video conference, data from the server is                                  to the client sites.

1. unicast
2. multicast
3. broadcast
4. none of the above

31. )A                      adds signals from different sources to create a single signal.

1. timestamp
2. sequence number
3. mixer
4. none of the above

32. )A                      changes the format of a high-bandwidth video signal to a lower quality narrow-bandwidth

signal.

1. timestamp
2. sequence number
3. translator
4. none of the above