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Multiple Choice Quiz
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Please answer all questions.

1

We can divide audio and video services into _______ broad categories.
A)three
B)two
C)four
D)none of the above
2

________ audio/video refers to on-demand requests for compressed audio/video files.
A)Streaming live
B)Streaming stored
C)Interactive
D)none of the above
3

___________ audio/video refers to the broadcasting of radio and TV programs through the Internet.
A)Interactive
B)Streaming live
C)Streaming stored
D)none of the above
4

_________ audio/video refers to the use of the Internet for interactive audio/video applications.
A)Interactive
B)Streaming live
C)Streaming stored
D)none of the above
5

According to the Nyquist theorem, we need to sample an analog signal ________times the highest frequency.
A)three
B)two
C)four
D)none of the above
6

In ________ encoding, the differences between the samples are encoded instead of encoding all the sampled values.
A)predictive
B)perceptual
C)both a and b
D)none of the above
7

__________ encoding is based on the science of psychoacoustics, which is the study of how people perceive sound.
A)Predictive
B)Perceptual
C)both a and b
D)none of the above
8

____________ is used to compress images.
A)MPEG
B)JPEG
C)either a or b
D)none of the above
9

____________ is used to compress video.
A)MPEG
B)JPEG
C)either a or b
D)none of the above
10

The first phase of JPEG is ___________.
A)DCT transformation
B)quantization
C)data compression
D)none of the above
11

The second phase of JPEG is ___________.
A)DCT transformation
B)quantization
C)data compression
D)none of the above
12

The third phase of JPEG is ___________.
A)DCT transformation
B)quantization
C)data compression
D)none of the above
13

Jitter is introduced in real-time data by the _______________.
A)error caused during transmission
B)delay between packets
C)both a and b
D)none of the above
14

To prevent _________, we can timestamp the packets and separate the arrival time from the playback time.
A)error
B)jitter
C)either a or b
D)none of the above
15

A ________buffer is required for real-time traffic.
A)playback
B)reordering
C)sorting
D)none of the above
16

A __________on each packet is required for real-time traffic.
A)timestamp
B)sequence number
C)both a and b
D)none of the above
17

Real-time traffic needs the support of ____________.
A)broadcasting
B)multicasting
C)both a and b
D)none of the above
18

__________ means changing the encoding of a payload to a lower quality to match the bandwidth of the receiving network.
A)Translation
B)Mixing
C)both a and b
D)none of the above
19

__________ means combining several streams of traffic into one stream.
A)Translation
B)Mixing
C)both a and b
D)none of the above
20

_________ is not suitable for interactive multimedia traffic because it retransmits packets in case of errors.
A)UDP
B)TCP
C)both a and b
D)none of the above
21

__________ is the protocol designed to handle real-time traffic on the Internet.
A)TCP
B)UDP
C)RTP
D)none of the above
22

RTP uses a temporary even-numbered _______ port.
A)UDP
B)TCP
C)both a and b
D)none of the above
23

___________ is a protocol for controlling the flow and quality of data.
A)RTP
B)RTCP
C)UDP
D)none of the above
24

RTCP uses an odd-numbered _______ port number that follows the port number selected for RTP.
A)UDP
B)TCP
C)both a and b
D)none of the above
25

___________ is an application protocol that establishes, manages, and terminates a multimedia session
A)RIP
B)SIP
C)DIP
D)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.
A)less than 10
B)more than 10
C)exactly 10
D)none of the above
28

A _______ shows the time a packet was produced relative to the first or previous packet.
A)timestamp
B)playback buffer
C)sequence number
D)none of the above
29

_______ are used to number the packets of a real-time transmission.
A)Timestamps
B)Playback buffers
C)Sequence numbers
D)none of the above
30

In a real-time video conference, data from the server is _______ to the client sites.
A)unicast
B)multicast
C)broadcast
D)none of the above
31

A _______ adds signals from different sources to create a single signal.
A)timestamp
B)sequence number
C)mixer
D)none of the above
32

A _______ changes the format of a high-bandwidth video signal to a lower quality narrow-bandwidth signal.
A)timestamp
B)sequence number
C)translator
D)none of the above
33

An RTP packet is encapsulated in _______.
A)a UDP user datagram
B)a TCP segment
C)an IP datagram
D)none of the above
34

When there is more than one source, the _______ identifier defines the mixer.
A)synchronization source
B)contributor
C)timestamp
D)none of the above





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