Polycom Polycom Certification 1K0-002 Questions & Answers

• Question 251:

  The H.323 Media Gateways require H.323 Terminals, which wish to make calls through the Gateway to ISDN sites, to

  A. perform a test with the other H.323 Terminals first.

  B. be registered with the Gatekeeper first.

  C. be using a Gatekeeper Prefix defined on the End Point.

  D. be using a Gateway Prefix registered on an Active Gatekeeper.

  E. be registered with the MCU first.

  F. call the Network administrator first.

  Correct Answer: D

• Question 252:

  Videoconference rate of a H.323 IP Call requires the packet examination of which of the following?

  A. Gatekeeper Registration Request

  B. UDP Header

  C. Packet Payload

  D. IP Header

  E. TCP Layer

  F. Medium Access Control Layer

  G. RTP Header

  Correct Answer: C

• Question 253:

  Which of the following functions can NOT be performed by a microphone mixer?

  A. Provide phantom power to microphones.

  B. Provide a means to adjust the relative gain of different microphones.

  C. Provide gain to convert mic-level signals to line-level signals.

  D. Provide a means to adjust the video display brightness.

  E. Provide a means to adjust the room acoustics

  Correct Answer: DE

• Question 254:

  Which ISDN Bearer Service is used for Video Conferencing?

  A. Circuit Switched Data

  B. Circuit Switched Video

  C. Low Speed Packet Switching

  D. Circuit Switched Voice

  E. High Speed Packet Switching

  Correct Answer: A

• Question 255:

  Which video coding is currently supported by H.320?

  A. H.261and H.263only

  B. H.263 only

  C. H.261, H.263 and H.264

  D. H.262 only

  E. H.261 only

  Correct Answer: C

• Question 256:

  Which of the following correctly describes typical audio phantom power?

  A. 12 volts DC applied to the tip and ring of a TRS connector used to power amplified headphones

  B. A DC voltage applied to pins 2 and 3 of an XLR connector returning through pin 1, used to power microphones

  C. A DC voltage applied to the center pin of an RCA type connector used to power remote pre- amplifiers

  D. 48 volts DC applied to a telephone circuit center pair used to provide power to the telephone set

  Correct Answer: B

• Question 257:

  Which audio coding uses a transport speed 16 kilobits per second?

  A. G.722

  B. G.728

  C. G.722.1

  D. G.711

  E. G.729

  Correct Answer: B

• Question 258:

  Which of the following accurately describes room gain as it applies to acoustic echo cancellation?

  A. Relative sensitivity of the microphones expressed in dB versus the same microphone in a "free field" environment

  B. Relative perceived loudness of a person speaking in a given room versus the same person speaking in an anechoic chamber

  C. Ratio of loudness of the participants voices versus the loudspeaker volume arriving at the microphone

  D. Measure of amplifier power driving the loudspeakers in a given conference room

  Correct Answer: C

• Question 259:

  Which of the following correctly describes reverberation and echo?

  A. Reverberation is long, distinct, acoustic reflections.

  B. Reverberation is irrelevant to conferencing audio.

  C. Echo is a coherent, distinct carry-on of sound.

  D. Echo is short, diffuse, acoustic reflections that linger after the original sound has stopped.

  E. Reverberation is an incoherent, diffuse, carry-on of sound

  Correct Answer: CE

• Question 260:

  Videoconferencing over IP End Point Systems must use signalling to establish a media channel conference Call Setup. Call Operations are part of what Standard?

  A. LAP / B

  B. LAP / D

  C. H.225/Q.921

  D. H.225/Q.931

  E. H.225/H.261

  Correct Answer: D