CIS 3347 Chapter 3 Multiple Choice

The type of multiplexer that divides the circuit horizontally into different light frequencies that are transmitted simultaneously across many channels is a: a. wavelength division multiplexer b. time division multiplexer c. statistical time division multiplexer d. frequency division multiplexer e. statistical frequency division multiplexer

a

To get more "bandwidth" in a digital transmission, you must: a. increase the range of frequencies available for a transmission b. increase the loudness per transmission c. decrease the bits per second transmission speed d. increase the phase shifts per transmission e. increase the baud rate per transmission

a

When all bits of a character are transferred one after another, the bits are transferred in ___________ mode. a. serial b. frequency division c. multiplexing d. parallel e. full complex

a

When converting analog voice data to digital signals, Pulse Code Modulation typically samples the incoming voice signal _______ times per second. a. 8,000 b. 8 c. 18,000 d. 64 e. 256

a

Which of the following is a characteristic of sound waves that can be modulated to convert digital data into analog signals? a. phase b. attenuation c. bipolar d. bandwidth e. codec

a

Which of the following is not a key advantage of digital transmission? a. It permits only low transmission rates. b. It is more efficient. c. It is simpler to integrate voice, video, and data on the same circuit. d. It is more secure. e. It produces fewer errors.

a

Which of the following is not an important factor to consider when selecting media to be used in a network? a. prestige value of the type of media b. type of network c. cost d. transmission distance e. security

a

____________ is a modulation technique that combines two different amplitude combinations with eight different phase combinations modulation to send four bits per symbol. a. quadrature amplitude modulation b. time division multiplexing c. synchronous digital line control d. pulse code modulation e. baseband signaling

a

____________ is one of the most commonly used coding schemes used in data transmission. a. ASCII b. ISDN c. MAU d. ATM e. FDM

a

_____________ is not a form of modulation used to transform digital data into analog signals. a. synchronous time division b. amplitude shift keying c. amplitude modulation d. frequency modulation e. phase modulation

a

_____________ refers to the difference between the original analog data and the approximation of that data using the techniques for translating from analog data to digital signals. a. quantizing error b. handshaking phase c. modulating frequency d. POTS anomaly e. amplitude Trellis effect

a

A(n) ___________ divides one high-speed communication circuit into several lower speed circuits for the primary reason of saving communication line costs. a. transponder b. multiplexer c. inverse multiplexer d. codec e. intelligent terminal

b

Frequency division multiplexing: a. operates by statistically time slicing the signal b. operates by dividing the signal into different frequencies c. uses a codec that divides signals into different channels d. operates by time slicing the signal e. operates by light dividing the signal

b

Having a conversation with someone using a cellular phone is an example of _________ transmission. a. simplex b. full-duplex c. half-duplex d. analog e. digital

b

The _____________ of a circuit determines a circuit's capacity. a. frequency b. bandwidth c. phase d. amplitude e. loudness

b

The two basic types of media are: a. statistical and frequency b. guided and wireless (radiated) c. local and wide area d. attenuator and Gaussian e. duplexed and non-duplexed

b

Time (non-statistical) division multiplexing differs from frequency division multiplexing because it: a. does not share a communication circuit b. splits the communication circuit vertically (with time slots) instead of horizontally c. increases the wavelength and phase angles of the baseband frequency used for transmission d. moves the baseband of a circuit by shifting it to a higher frequency e. reduces baseband signal velocity more than frequency division multiplexing

b

When sending four bits at a time using frequency modulation, the number of different frequency levels that would be needed would be _______. a. 24 b. 16 c. 2 d. 8 e. 4

b

______ is a modem standard that uses Lempel-Ziv encoding to compress data. a. V.22 b. V.44 c. V.32bis d. V.34 e. RS 232

b

__________ is a line-of-sight type of wireless media. a. coaxial cable b. microwave c. radio d. twisted pair e. fiber optic

b

____________ is used by IM and other applications that provide voice services over lowerspeed digital circuits. a. pulse code modulation b. adaptive differential pulse code modulation c. Voice conversation d. code modulation e. phase modulation

b

Equipment used to transform analog voice signals to digital signals and digital signals to analog signals. a. voice converter b. modem c. codec d. multiplexer e. demodulator

c

If the highest frequency of a circuit is 10KHZ and the lowest frequency is 900 Hz, the bandwidth available for this circuit is : a. 890 Hz b. 8900 HZ c. 9100 Hz d. 9Khz e. 890 KHz

c

The ability to transmit in both directions, but only in one direction at a time is an example of _______________ transmission. a. simplex b. full-duplex c. half-duplex d. analog e. digital

c

The direction in which the sound wave begins is known as: a. amplitude, which our ears detect as loudness b. frequency, which our ears detect as pitch c. phase d. bandwidth e. furlong

c

The earliest type of fiber optic systems were: a. Graded index multimode b. Attenuated c. Multimode d. Single mode e. Step mode

c

The height of a sound wave is called its: a. frequency b. phase c. amplitude d. bandwidth e. furlong

c

The type of media usually installed on homes and businesses by the telephone company is called ____________. a. fiber optic cable b. coaxial cable c. twisted pair d. phone cable e. phone wire

c

The typical range of human hearing is: a. 0 to 4,000 Hz b. 0 to 1,200 Hz c. 20 to 14,000 Hz d. 0 to 300 Hz e. 0 to 56,000 Hz

c

Which of the following statements is true? a. the longer the distance of a telephone wire between sender and recipient, the lower the bandwidth across that wire b. the shorter the distance of a telephone wire between sender and recipient, the lower the bandwidth across that wire c. bandwidth is constant across any wire, therefore distance is not relevant to its capacity d. the longer the distance of a telephone wire between sender and recipient, the higher the bandwidth across that wire e. bandwidth is not a term that can be used when discussing telephone transmissions

c

Which type of digital signaling would experience fewer errors because it has more distinct signals? a. unipolar b. serial c. bipolar d. attenuation e. Huffman encoding signal

c

With respect to converting digital data into analog signals, AM stands for: a. Asynchronous Manchester b. Analog Multimode c. Amplitude Modulation d. Anomaly Multiplexing e. Analytical Mosaic

c

With which type of digital signaling does the signal always return to zero volts after each bit? a. Non-return-to-zero signaling b. Unipolar signaling c. Return-to-zero signaling d. Data rate signaling e. Huffman encoding signal

c

_________ is the basic physical layout of the circuit. a. point-to-point configuration b. configuration c. circuit configuration d. circuit design e. circuit plan

c

___________ refers to the spreading of the signal that different parts of the signal arrive at different times at the destination. a. turnaround time b. propagation delay c. dispersion d. insulation e. attenuation

c

____________ refers to changing the shape of the sound wave in different ways to represent a 1 or a 0. a. digitizing. b. sampling c. modulation d. demodulation e. shaping

c

____________ transmission is prone to interference from smoke, heavy rain and fog and requires line-of-sight. a. microwave b. radio c. infrared d. fiber optic e. led

c

A(n) __________ circuit is another name for a multipoint configuration. a. analog b. dedicated c. point-to-point d. shared e. simplex

d

In which type of modulation is a 1 distinguished from a 0 by shifting the direction in which the wave begins? a. bandwidth modulation b. amplitude modulation c. frequency modulation d. phase modulation e. codec modulation

d

The acronym, Modem, stands for _________________. a. multiplexing/demultiplexing b. more/demote c. Mode-M technique d. modulator/demodulator e. Mod emulation technique

d

Two fundamentally different types of data are: a. DSL and ADSL b. asymmetric and symmetric c. Microsoft and IBM d. digital and analog e. local area and wide area

d

Which is not true about point-to-point circuits? a. point-to-point circuits are dedicated to the use of the two computers. b. point-to-point circuits are more expensive than multipoint circuits. c. point-to-point circuits are called dedicated circuits. d. point-to-point circuits reduce the amount of cable required and use the circuit more efficiently than multipoint circuits. e. point-to-point circuits are used when the computers generate enough traffic to fill the capacity of the communication circuit.

d

Which of the following media has the lowest error rates and the highest transmission speeds? a. coaxial cable b. unshielded twisted pair c. shielded twisted pair d. fiber optic cable e. infrared

d

Which of the following statements is correct? a. Parallel transmission is most often used for sending data on a circuit that is made up of one wire. b. Parallel transmission is distinguished from serial transmission by the fact that the transmitting device sends a single bit, then a second bit, and so on, until all the bits are transmitted. c. Parallel transmission is only used for analog data. d. Serial transmission is slower than parallel transmission. e. Parallel transmission is the same as serial transmission.

d

Which of the following would be considered a type of wireless media? a. unshielded twisted pair b. shielded twisted pair c. coaxial cable d. microwave e. fiber optics

d

____________ refers to the transmission characteristics of the circuit. a. handshaking b. virtual circuit c. bonding d. logical circuit e. physical circuit

d

________________ separate channels to reduce interference between channels in frequency division multiplexing. a. Channel blockers b. Statistical dividers c. Attenuators d. Guardbands e. Adaptive differential processors

d

ransmission speeds: a. are the same among all media b. are not a factor in selecting a media because all media have more than enough speed to serve current communication demands c. are a constant, 56Kbps, for all media types d. differ widely among media e. always have a direct correlation with security

d

A coding scheme that uses 10 bits to represent each character is capable of representing _________ different characters. a. 256 b. 20 c. 200 d. 512 e. 1024

e

Another term for the weakening of a signal over distance is: a. turnaround time b. propagation delay c. dispersion d. insulation e. attenuation

e

How many bits are required to sample an incoming signal 4000 times per second using 64 different amplitude levels? a. 64 b. 32 c. 16 d. 8 e. 6

e

In general, networks designed to transmit primarily computer data are likely to be ________, while networks designed to transmit voice data are likely to be ________. a. slow, fast b. level 1, level 2 c. numeric, musical d. direct, indirect e. digital, analog

e

Microwave transmission: a. is a type of high frequency radio communication b. requires a clear line-of-sight path c. is typically used for long distance data transmission d. does not require the laying of any cable e. all of the above

e

Which of the following media can best withstand harsh environmental conditions? a. shielded twisted pair b. unshielded twisted pair c. Cat 5 twisted pair d. coaxial cable e. fiber optic cable

e

Which of the following media is the least secure? a. coaxial cable b. unshielded twisted pair c. shielded twisted pair d. fiber optic cable e. infrared

e

___________ is not a type of digital signaling technique. a. Non-return-to-zero signaling b. Unipolar signaling c. Manchester encoding d. Return-to-zero signaling e. Data rate signaling

e

______________ refers to the time it takes for a signal to travel from sender to recipient (highly exaggerated with satellite transmission). a. Line-of-sight effect b. Multimode index c. Saturation effect d. Raindrop attenuation e. Propagation delay

e

igital Subscriber Line: a. is a fairly recent approach to provide higher data transmission rates across traditional voice circuits in the local loop b. combines analog transmission and frequency division multiplexing c. involves the use of a customer premises equipment (CPE) d. uses a combination of amplitude and phase modulation e. all of the above

e

Data is physically transmitted from one computer or terminal to another in the ________ layer. a. physical b. transport c. application d. terminal e. data link

a

If each sample uses 16 bits and the number of samples taken each second is 8000; then the transmission speed on the circuit is? a. 128 Kbps b. 64 Kbps c. 12800 bps d. 96 Kbps e. 32000 bps

a

Inverse multiplexing means: a. combining several low speed circuits to enable them to be transmitted across one high speed circuit b. multiplexing from the terminal to the host, rather than from the host to the terminal c. combining high speed circuits to enable them to be transmitted across one low speed circuit d. inverting the frequencies used for transmission across a low speed circuit for switching to a digital circuit e. multiplexing to a codec, rather than to a modem

a

The representation of the character A by the group of 8 bits, 01000001, is an example of: a. digital coding b. phase modulation c. binary modulation d. analog transmission e. pitch variation

a