Chapter 25 Quiz

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