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QUESTION 27:
A PBX can select the most economical trunk group using:
A. Translations.
B. Least cost routing.
C. Automatic selection lists.
D. Account code routing. Answer: B
QUESTION 28:
Tie trunks are not switched by:
A. The telco.
B. The PBX.
C. The premise switch.
D. Using LCR. Answer: A
QUESTION 29:
Direct Inward Dialing uses:
A. Key system lines.
B. Loop start functionality.
C. Digital key systems.
D. Trunks. Answer: D An OPX is:
A. An outside party line.
B. A station set on a different premise than the PBX.
C. An outside priority extension call.
D. Onside parameter exchange. Answer: C
QUESTION 31:
If you want to track the cost of long distance calls, the feature you use is called:
A. SMDR
B. CAR
C. LLCR
D. LCR Answer: A
QUESTION 32:
The LEC service that provides PBX like features from the LEC switch is:
A. Centrex.
B. SMDR.
C. Off-premise extensions.
D. Off-premise switching. Answer: A
QUESTION 33:
The three applications of Centrex are PBX replacement, full featured business line, and:
A. Resale.
B. Data switching.
C. Centralized attendant switching.
D. Trunking.
Answer: A Flat rate local service is:
A. Mileage sensitive.
B. Timed.
C. Fixed rate per month.
D. Priced per zone called. Answer: C
QUESTION 35:
A call outside of the local calling area but within the LATA is called:
A. A dial round call.
B. An IXC call.
C. A local toll call.
D. An interLATA call. Answer: C
QUESTION 36:
Flat rate toll is:
A. Mileage sensitive.
B. A fixed price per month.
C. Provided by LECs only.
D. Charge by the minute. Answer: D
QUESTION 37:
The number of trunk circuit cards is reduced in the PBX by using:
A. Combined function cards.
B. Off premise extensions.
C. Digital station sets.
D. Integrated T carrier trunking. Answer: D
QUESTION 38:
A. The attendant.
B. Tie lines.
C. Dialing 9.
D. System administrators.
Answer: C
QUESTION 39:
If a PBX has only one trunk group to the CO, it is most likely a:
A. DID group.
B. Outdial group.
C. Combo group.
D. T carrier trunk. Answer: C
QUESTION 40:
A residence phone normally uses ____________ for long distance calls.
A. Credit cards
B. Outdial lines
C. Dedicated access
D. Switched access Answer: D
QUESTION 41:
Call waiting, three-way calling, call return, and auto recall are:
A. Services often used with PBX outdial trunks.
B. Digital PBX features.
C. Not available from the LEC.
D. Not useful on PBX trunks. Answer: D
QUESTION 42:
Businesses with sales people using cell phones often make use of:
A. SMDR on cell phones.
B. PBX tie lines.
C. Call transfer with disconnect.
D. Identified outward dialing.
Answer: C
QUESTION 43:
If a call first comes into the middle of a hunt group, and stops hunting at the last line in the group without hunting over all lines, ____________is used.
A. Circular hunt
B. Preferential hunt
C. Sequential hunt
D. Most idle line hunt
Answer: C
QUESTION 44:
An OPX is connected by a:
A. Switched access arrangement.
B. Switched service.
C. Dedicated access arrangement.
D. Dedicated service. Answer: D
QUESTION 45:
FT1 provides bandwidth in:
A. Digital switches.
B. Internet service providers.
C. Multiples of 1.544 Mbps.
D. Multiples of 64 kbps. Answer: D
QUESTION 46:
The POP is:
A. Where the connection to the IXC is made.
B. Where the connection to the LEC is made.
C. The boundary of the IXC service area.
D. The location of the IXC switch.
Answer: A
QUESTION 47:
If an RBOC gains permission to provide long distance and enhanced services within its territory, it will become:
A. A competitive local exchange carrier.
B. An interexchange carrier.
C. An integrated communications provider.
D. An Internet service provider.
Answer: C
QUESTION 48:
A major application for ISDN PRI is for:
A. Small key system networking.
B. Internet service providers.
C. Integrated communication provider lines.
D. LAN to LAN networking. Answer: C
QUESTION 49:
A service that interconnects PBXs without the use of dedicated trunks is called a:
A. Centrex service.
B. Switched service.
C. Private network.
D. Virtual private network. Answer: D
QUESTION 50:
Three aspects of service common to analog and digital are switching, signaling, and:
A. Conversion.
B. Billing.
C. Transmission.
D. Multiplexing. Answer: C
QUESTION 51:
Sound is the ______________movement of air.
A. Electrical.
B. Optical.
C. Longitudinal.
D. Mechanical. Answer: D
QUESTION 52:
A transducer is a device that:
A. Amplifies voice signals.
B. Changes energy from one form to another.
C. Converts voice from digital to analog.
D. Converts voice from analog to digital. Answer: B
QUESTION 53:
Hertz is a measurement of:
A. Wavelength.
B. Frequency.
C. Amplitude.
D. Bits/second. Answer: B
QUESTION 54:
The voice band is commonly called:
A. A 4-kilohertz band.
B. A 32-Mbps band.
C. 1.544 Mbps wide.
D. 8 kilohertz wide.
QUESTION 55:
Loss of signal strength over distance is:
A. Distortion.
B. Attenuation.
C. Transfiguration.
D. Transduction Answer: B
QUESTION 56:
The factor in long loops that causes distortion of female voices is:
A. Low frequencies have more attenuation than high frequencies.
B. Attenuation is higher at high frequencies.
C. Load coils attenuate high frequencies.
D. Amplifiers work less efficiently at high frequencies. Answer: B
QUESTION 57:
Load coils equalize attenuation by:
A. Attenuating lower frequencies more than higher frequencies.
B. Attenuating higher frequencies more lower frequencies.
C. Attenuating both low and high frequencies.
D. Amplifying central frequencies. Answer: D
QUESTION 58:
Load coils on long loops are being replaced by:
A. Digital amplifiers.
B. Subscriber switches.
C. Digital loop carrier.
D. Digital channel banks. Answer:
A multiplexer:
A. Switches analog signals.
B. Replaces analog channel banks.
C. Converts signals from digital to analog or vice versa.
D. Combines a number of different signal sources into a single stream. Answer: D
QUESTION 60:
The most frequently used method of analog multiplexing is called:
A. Frequency division multiplexing.
B. Pulse amplitude modulation.
C. Pulse code modulation.
D. Phase multiplexing. Answer: A
QUESTION 61:
In order to provide amplification with lower noise and distortion:
A. The signal is companded.
B. The signal is split into transmit and receive paths.
C. Load coils are eliminated from the transmission system.
D. Full duplex copper loops are used. Answer: B
QUESTION 62:
Four kHz slices are used in:
A. PAM signaling.
B. Frequency-division multiplexing.
C. SONET/SDH systems.
D. OC1 carrier systems. Answer: B
Modulating a carrier signal with a voice signal results in a carrier signal and:
A. A broadband signal.
B. An over and under band signal.
C. An upper and lower sideband.
D. A bandpass signal. Answer: C
QUESTION 64:
Three factors caused digital transmission systems to win out over analog systems. They are _______, distortion varying by frequency, and cost of linear integrated circuits.
A. Cost of repeater stations
B. Emergence of optical switching
C. Noise
D. Cost of load coils
Answer: C
QUESTION 65:
A _____________ varies in descrete steps.
A. Digital signal
B. Analog carrier
C. Voice signal
D. Multiplexed signal Answer: A
QUESTION 66:
A digital signal has a bandwidth expressed in _________ per second.
A. Baud
B. Hertz
C. Cycles
D. Bits Answer: D In a digital system, regenerators are placed before the signal drops below the:
A. Analog signal level.
B. Noise level.
C. Noise margin.
D. DS0 level. Answer: C
QUESTION 68:
As long as interfering signals are kept below the noise margin, digital transmission systems are immune from:
A. Frequency distortion.
B. Crosstalk.
C. Echo.
D. Delay distortion.
Answer: B
QUESTION 69:
To convert from analog to digital and vice versa, digital transmission systems use:
A. Multiplexers.
B. FDM.
C. Type A channel banks.
D. Codecs. Answer: D
QUESTION 70:
A codec would be found in:
A. An A type channel bank.
B. An analog phone.
C. A digital phone.
D. A SS7 signal transfer point. Answer: C
The most common codec uses:
A. Adaptive pulse code modulation.
B. Pulse code modulation.
C. Delta modulation.
D. Frequency modulation. Answer: B
QUESTION 72:
The three steps in PCM are _______, quantizing, and companding.
A. Compression
B. Expansion
C. Sampling
D. Conversion Answer: C
QUESTION 73:
Law and Mu law are:
A. European and U.S. standards, respectively.
B. Ways of performing the FDM function.
C. Incompatible systems (calls cannot be made between the two).
D. Optical carrier modulation methods. Answer: A
QUESTION 74:
A 4 kilohertz signal must be sampled at _________ to be accurately reproduced after conversion to digital.
A. Frequent intervals
B. 64 kilobits/second
C. 8 kilohertz
D. Every 125 milliseconds
Answer: C Adaptive predictive coding techniques are used in:
A. Digital switching.
B. Modern voice codecs.
C. Obsolete voice codecs.
D. Optical multiplexing. Answer: B
QUESTION 76:
Further processing of the digital signal beyond that done by PCM is needed to:
A. Avoid transmitting redundant information.
B. Accommodate analog and digital data.
C. Eliminate crosstalk.
D. Convert from 4 wire to 2 wire transmission. Answer: A
QUESTION 77:
28 DS1s, or 672 DS0s, can be multiplexed into:
A. One type A channel bank.
B. An L3 carrier system.
C. A DS1c bit stream.
D. A DS3 bit stream. Answer: D
QUESTION 78:
A DS1 has:
A. A frame rate of 4,000 frames per second.
B. 24 DS0s plus a framing bit in each frame.
C. 30 B channels plus 1 D channel.
D. A bit rate of 1.536 Mbps. Answer: B
QUESTION 79:
A. IEEE 802.3.
B. ANSI T1.402.
C. ITU Q.931.
D. SONET/SDH.
Answer: D
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