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Exam Code: 70-743
Exam Name: Upgrading Your Skills to MCSA: Windows Server 2016
Updated: Aug 18, 2017
Q&As: 107

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 70-743 dumps

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
70-743 exam Correct Answer: D
What does Automatic Gain Control (AGC) do?
A. It turns down the volume to the far-end microphone.
B. It turns up the volume to the far-end microphone.
C. It builds the volume to the near-end microphone.
D. It selects among multiple microphones.
Correct Answer: C
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
70-743 dumps Correct Answer: CE
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
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”
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
70-743 pdf Correct Answer: C
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
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
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
70-743 vce Correct Answer: A
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
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
70-743 exam Correct Answer: DE
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
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
70-743 dumps Correct Answer: C
Local Area Network Metallic Interfaces are
A. C and D
B. connectionless oriented connectivity, shared network that serves limited distances.
C. connection oriented, point to point connectivity only.
D. connectionless oriented connectivity, shared network that serves unlimited distances.
E. All of the other alternatives apply.
F. unshared network that serves unlimited endpoints.
Correct Answer: B
If a Y/C cable is plugged in and the result is a black and white video, which signal is not being seen?
A. Chrominance signal
B. Red, Green, and Blue signal
C. Super VHS sync signal
D. Luminance signal
70-743 pdf Correct Answer: A
The H.225 describes a reliable transport for which two video conferencing requirements?
A. Data (T.120) Packets
B. Call Signaling Packets
C. Audio Packets
D. RAS Signaling Packets
E. Video Packets
Correct Answer: AB
Where is the G.711 A-law used?
A. ATM Networks
B. T1 Networks
C. T3 Networks
D. E1 Networks
70-743 vce Correct Answer: D
When configuring VTCs and MCUs to Statically configured IP networks what three settings would need to
be provided for the system parameters?
A. IP Date and Time Clock
B. IP Network Provider Name
C. IP Network Speed in Packets per second
D. IP Mask
E. Default Gateway (Router)
F. Domain Name Settings
G. IP Network Speed in Bytes per second
H. IP Address
Correct Answer: DEH
What effect does the zoom function have relative to the camera’s field of view?
A. It can either widen or narrow the field at full zoom.
B. It narrows the field at full zoom.
C. It widens the field at full zoom.
D. It has no effect on the field of view.
70-743 exam Correct Answer: B
Which of the following correctly describe the role room acoustics play regarding acoustic echo
A. Hard room surfaces act as reflectors for sound, causing multiple acoustic paths from loudspeaker to
B. Fans, heaters, and air conditioners add background noise to the room, changing the room acoustic
C. Heavy drapes and acoustic absorbers remove acoustic paths and therefore cause problems for
acoustic echo cancellers.
D. People moving around in a room change the acoustic paths presented to a microphone.
Correct Answer: AD
MCU is the acronym for which of the following?
A. Multipoint Control Unit
B. Multipoint Capabilities and Unidirectional
C. Management Conferencing Union
D. Management Control Unit
70-743 dumps Correct Answer: A
Which of the following are the two most correct definitions of ISDN reference points?
A. S/T Reference point is between the Network Termination and the Network Exchange Equipment
B. S/T Reference point is between ISDN Terminal Equipment and the Network Termination
C. U Reference point is between the Network Termination and the Network Exchange Equipment
D. U Reference point is between the ISDN terminal and the network termination

Correct Answer: BC
The H.264 supports which of the following frame rates?
A. 30, 10 only
B. 30, 15, 12, 7.5 only
C. 30, 15, 10, 7.5, 6, 5, 4, 3, 2, and 1
D. 30, 10, 7.5, 6 only
70-743 pdf Correct Answer: C
MPEG4 Part 10 (H.264) coder requires what network data rate to sustain full motion video at SIF
A. More than 10,000 kilobits per second
B. More than 3,000 kilobits per second
C. Less than 1 kilobit per second
D. Less than 384 kilobits per second
Correct Answer: D
The G.723.1 uses which bit rates?
A. 8 and 16 kilobytes per second
B. 5.3 and 6.3 kilobytes per second
C. 5.3 and 6.3 kilobits per second
D. 12 and 24 kilobits per second
E. 8 and 16 kilobits per second
70-743 vce Correct Answer: C
Browsing sites and Managing Multipoint Conferences from the Video End Point is part of which standard?
A. H.233
B. H.243
C. H.234
D. H.242
E. H.281
Correct Answer: B
Network Address Translation works in which OSI Layer?
A. Layer 4
B. Layer 3
C. Layer 5
D. None of the other alternatives apply.
70-743 exam Correct Answer B

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