Data Communication Quiz | Data Communication Objective Type Questions and Answers

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Questions
21 In _______ transmission, the channel capacity is shared by both communicating devices at all times.
A simplex
B half-duplex
C full-duplex
D half-simplex

Answer: full-duplex
22 ________ is an idea or concept that is a precursor to an Internet standard.
A RCF
B ID
C RFC
D none of the above

Answer: RFC
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23 An unauthorized user is a network _______ issue.
A Security
B Reliability
C Performance
D All the above

Answer: Security
24 _______ refers to the structure or format of the data, meaning the order in which they are presented.
A Semantics
B Syntax
C Timing
D All of the above

Answer: Syntax
25 In a _______ connection, more than two devices can share a single link.
A multipoint
B point-to-point
C primary
D secondary

Answer: multipoint
26 The _______ is the physical path over which a message travels.
A Protocol
B Signal
C Medium
D All the above

Answer: Medium
27 Which topology requires a central controller or hub?
A Mesh
B Bus
C Star
D Ring

Answer: Star
28 Communication between a computer and a keyboard involves ______________ transmission.
A simplex
B half-duplex
C full-duplex
D automatic

Answer: simplex
29 In the original ARPANET, _______ were directly connected together.
A routers
B host computers
C networks
D IMPs

Answer: IMPs
30 Which organization has authority over interstate and international commerce in the communications field?
A FCC
B IEEE
C ITU-T
D ISOC

Answer: FCC
31 In a ________ connection, three or more devices share a link.
A point-to-point
B multipoint
C (a) and (b)
D none of the above

Answer: multipoint
32 In a frequency-domain plot, the horizontal axis measures the ________.
A phase
B frequency
C slope
D peak amplitude

Answer: frequency
33 For a ______ channel, the Nyquist bit rate formula defines the theoretical maximum bit rate.
A low-pass
B bandpass
C noisy
D noiseless

Answer: noiseless
34 If the available channel is a ____ channel, we cannot send a digital signal directly to the channel.
A low-pass
B low rate
C bandpass
D high rate

Answer: bandpass
35 As frequency increases, the period ________.
A increases
B decreases
C doubles
D remains the same

Answer: decreases
36 Given two sine waves A and B, if the frequency of A is twice that of B, then the period of B is ________ that of A.
A one-half
B twice
C the same as
D indeterminate from

Answer: twice
37 _______ describes the position of the waveform relative to time 0.
A Amplitude
B Phase
C Frequency
D Voltage

Answer: Phase
38 ________ is a type of transmission impairment in which an outside source such as crosstalk corrupts a signal.
A Noise
B Distortion
C Attenuation
D Decibel

Answer: Noise
39 The _____ of a composite signal is the difference between the highest and the lowest frequencies contained in that signal.
A period
B bandwidth
C frequency
D amplitude

Answer: bandwidth
40 A periodic signal completes one cycle in 0.001 s. What is the frequency?
A 1 Hz
B 100 Hz
C 1 KHz
D 1 MHz

Answer: 1 KHz

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