Multimedia and Quality of Service MCQs - Computer Networking

This Portion of Computer Networking contains Computer Networking Multimedia and Quality of Service MCQs (Multiple Choice Questions and Answers).

This Section covers below lists of topics.

1 COMPRESSION
• Lossless Compression
• Lossy Compression

2 MULTIMEDIA DATA
• Text
• Image
• Video
• Audio

3 MULTIMEDIA IN THE INTERNET
• Streaming Stored Audio/Video
• Streaming Live AudioA’ideo
• Real-Time Interactive Audio/Video

4 REAL-TIME INTERACTIVE PROTOCOLS
• Rationale for New Protocols
• RTP
• RTCP
• Session Initialization Protocol (SIP)
• H.323
• SCTP

5 QUALITY OF SERVICE
• Data-Flow Characteristics
• Flow Classes
• Flow Control to Improve QoS
• Integrated Services (IntServ)
• Differentiated Services (DiffServ)

PRACTICE IT NOW TO SHARPEN YOUR CONCEPT AND KNOWLEDGE

1. In ______ compression, the integrity of the data _ preserved because compression and decompression algorithms are exact inverses of each other.

lossless; is
lossless; is not
lossy; is
lossy; is not

2. Which of the following compression method is not lossless?

run-length coding
dictionary coding
arithmetic coding
predictive coding

3. Lempel Ziv Welch (LZW) method is an example of ______________.

run-length coding
dictionary coding
arithmetic coding
predictive coding

4. ______________ assigns shorter codes to symbols that occur more frequently and longer codes to those that occur less frequently.

run-length coding
dictionary coding
arithmetic coding
Huffman coding

5. In arithmetic coding the entire message is mapped to a real number in the interval _________.

(0, 1)
[0, 1]
[0, 1)
(0, 1]

6. Which of the following compression methods is considered as predictive coding?

DM
DPCM
LPC
All of the choices are correct.

7. In ________, instead of quantizing each sample separately, the differences are quantized.

predictive coding
perceptual coding
transfer coding
pulse code modulation

8. The adaptive DM (ADM) is used to solve the problem of _________ in DM.

a slowly growing original function
a fast growing original function
overload distortion or granular noise
All of the choices are correct.

9. _______ can achieve a high level of compression and is normally used in military for compressing speech. The synthesized speech, though intelligible, lacks naturalness and quality to identify the speaker.

LCP
DPCM
ADM
ADPCM

10. __________ coding is based on the science of psychoacoustics, which is the study of how people perceive sound.

predictive coding
perceptual coding
transfer coding
None of the choices are correct.

11. Which step of transform coding used in multimedia is lossy?

transformation step
quantization step
reverse transformation step
All of the choices are correct.

12. Since the square matrix that represents the DCT coefficient is an ____________ matrix, inverse and transpose are the same.

linear
square
orthogonal
symmetric

13. ____________ is used to compress images.

MPEG
JPEG
MPEG or JPEG
None of the choices are correct.

14. The first phase of JPEG compression process is ___________.

DCT transformation
quantization
lossless compression encoding
None of the choices are correct.

15. The second phase of JPEG compression process is ___________.

DCT transformation
quantization
lossless compression encoding
None of the choices are correct.

16. The third phase of JPEG is ___________.

DCT transformation
quantization
lossless compression encoding
None of the choices are correct.

17. ____________ is used to compress video.

MPEG
JPEG
MPEG or JPEG
None of the choices are correct.

18. In MPEG method, the __ compression of each frame is done with JPEG; redundant frames are removed during _ compression.

temporal; spatial
spatial; temporal
lossy; lossless
None of the choices are correct.

19. ________ audio/video refers to on-demand requests for compressed audio/video files.

Streaming live
Streaming stored
Interactive
None of the choices are correct.

20. ___________ audio/video refers to the broadcasting of radio and TV programs through the Internet.

Streaming live
Streaming stored
Interactive
None of the choices are correct.

21. _________ audio/video refers to the use of the Internet for interactive audio/video applications.

Streaming live
Streaming stored
Interactive
None of the choices are correct.

22. A ________ buffer is required for real-time traffic.

playback
reordering
sorting
None of the choices are correct.

23. To establish time relationship and order of the packets, a real-time traffic needs __________ on each packet

only a timestamp
only a sequence number
both a timestamp and a sequence number
None of the choices are correct

24. __________ means changing the encoding of a payload to a lower quality to match the bandwidth of the receiving network.

Translation
Mixing
Encoding
None of the choices are correct.

25. __________ means combining several streams of traffic into one stream.

Translation
Mixing
Encoding
None of the choices are correct.

26. To makeup for the lost and corrupt packets, the real-time traffic normally ____________.

retransmits the lost and corrupt packets
uses forward error correction (FEC) method
retransmits the whole traffic
None of the choices are correct.

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

less than 10
more than 10
exactly 10
None of the choices are correct.

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

timestamp
playback buffer
sequence number
None of the choices are correct.

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

Timestamps
Playback buffers
Sequence numbers
None of the choices are correct.

30. A _______ adds signals from different sources to create a single composite signal.

timestamp
sequence number
mixer
None of the choices are correct.

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

timestamp
sequence number
translator
None of the choices are correct.

32. _____ is an application layer protocol that establishes, manages, and terminates a multimedia session.

SIP
H.323
RTP
None of the choices are correct.

33. _____ is a standard designed by ITU to allow telephones on the public telephone network to talk to computers connected to the Internet.

SIP
H.323
RTP
None of the choices are correct.

34. _____ is not suitable for interactive multimedia traffic because we cannot allow retransmission of packets.

TCP
UDP
RTP
None of the choices are correct.

35. __________ is the protocol designed to handle real-time traffic on the Internet.

TCP
UDP
RTP
None of the choices are correct.

36. ___________ is a protocol for controlling the flow and quality of data in association with RTP.

SIP
RTCP
H.232
None of the choices are correct.

37. An RTP packet is encapsulated in _______.

a UDP user datagram
a TCP segment
an IP datagram
None of the choices are correct

38. Stream Control Transmission Protocol (SCTP) is a new _____________ protocol.

reliable, character-oriented
reliable, message-oriented
unreliable, message-oriented
None of the choices are correct.

39. SCTP allows __________ service in each association.

only single-stream
multistream
only double-stream
None of the choices are correct.

40. SCTP association allows _____________ for each end.

only one IP address
multiple IP addresses
only two IP addresses
None of the choices are correct.

41. In SCTP, a data chunk is numbered using ________.

a TSN
an SI
an SSN
None of the choices are correct.

42. To distinguish between different streams, SCTP uses ___________.

a TSN
an SI
an SSN
None of the choices are correct

43. To distinguish between different data chunks belonging to the same stream, SCTP uses ___________.

TSNs
SIs
SSNs
None of the choices are correct.

44. TCP has ; SCTP has .

packets; segments
packet; frames
segments; frames
None of the choices are correct.

45. The control information in SCTP are carried in the ________.

header control field
control chunks
data chunks
None of the choices are correct.

46. In SCTP, acknowledgment numbers are used to acknowledge _____________.

both data chunks and control chunks
only control chunks
only data chunks
None of the choices are correct

47. In an SCTP packet, control chunks come ___________ data chunks.

after
before
between
None of the choices are correct.

48. A connection in SCTP is called a(n) ____________.

negotiation
association
transmission
None of the choices are correct.

49. Which of the following is not a characteristic attributed to a data flow?

reliability
delay
bandwidth
All choices are correct

50. Which of the following method is used to improve QoS?

Scheduling
Resource reservation
Traffic shaping or policing
All choices are correct.

51. Which of the following method is a scheduling technique?

FIFO queuing
priority queuing
weighted fair queuing
All choices are correct.

52. A _______ algorithm is a policing technique that shapes bursty traffic into fixed-rate traffic by averaging the data rate, but it does not give credit to the user during idle periods.

leaky bucket
token bucket
priority queuing
weighted fair queuing

53. A _______ algorithm is a policing technique that allows bursty traffic at a regulated maximum rate and give some credits to the user during idle periods.

leaky bucket
token bucket
priority queuing
weighted fair queuing

54. Which QoS model depends heavily on resource reservation?.

IntServ
DiffServ
Scheduling
Policing

55. Integrated Services is a _______________ QoS model designed for IP.

flow-based
class-based
reliability-based
efficiency-based

56. Differentiated Services is a _______________ QoS model designed for IP.

flow-based
class-based
reliability-based
efficiency-based

57. Guaranteed services in IntServ model are required for __________ application

on-demand audio/video
stored audio/video
real-time
All choices are correct

58. Controlled-Load services in IntServ model is designed for applications that ______________________.

can accept some delays, but are sensitive to packet loss
can accept some packet loss, but are sensitive to delay
are sensitive to both delay and packet loss
are sensitive to neither delay nor packet loss

59. IntServ model is ________________________________________

scalable but has service type limitation.
scalable and does not have service type limitation.
not scalable and has service type limitation.
not scalable but does not have service type limitation.

60. To implement _, the DS node uses _________ such as meters, markers, shapers, and droppers

Diffserv; traffic conditioners
Diffserv; gadgets
IntServ; traffic conditioners
IntServ; gadgets

Computer Networking – Multimedia and Quality of Service MCQs

1. In __________ compression, the integrity of the data _____ preserved because compression and decompression algorithms are exact inverses of each other.