A sine wave is ________.
1.periodic and continuous
2.aperiodic and continuous
3.periodic and discrete
4.aperiodic and discrete
Posted Date:-2022-06-17 11:44:15
A _________ sine wave is not useful in data communications; we need to send a _______ signal
1.composite; single-frequency
2.single-frequency; composite
3.single-frequency; double-frequency
4.none of the above
Posted Date:-2022-06-17 12:34:37
For a ______ channel, the Nyquist bit rate formula defines the theoretical maximum bit rate.
1.noisy
2.noiseless
3.bandpass
4.low-pass
Posted Date:-2022-06-17 12:40:05
For a ______ channel, we need to use the Shannon capacity to find the maximum bit rate.
1.noisy
2.noiseless
3.bandpass
4.low-pass
Posted Date:-2022-06-17 12:41:23
If the bandwidth of a signal is 5 KHz and the lowest frequency is 52 KHz, what is the highest frequency?
1. 5 KHz
2.10 KHz
3.47 KHz
4. 57 KHz
Posted Date:-2022-06-17 11:29:13
If the bandwidth of a signal is 5 KHz and the lowest frequency is 52 KHz, what is the highest frequency?
1. 5 KHz
2.10 KHz
3.47 KHz
4. 57 KHz
Posted Date:-2022-06-17 11:29:14
The physical layer is concerned with the movement of _______ over the physical medium.
1.programs
2.dialogs
3.protocols
4.bits
Posted Date:-2022-06-17 11:17:15
The term ......... describes the position of the waveform relative to time 0.
1.Frequency
2.Phase
3.Phase Shift
4.Time period
Posted Date:-2022-06-17 11:24:44
The _____ of a composite signal is the difference between the highest and the lowest frequencies contained in that signal.
1.frequency
2.period
3.bandwidth
4.amplitude
Posted Date:-2022-06-17 12:35:26
The _________ product defines the number of bits that can fill the link.
1.bandwidth-period
2. frequency-amplitude
3.bandwidth-delay
4.delay-amplitude
Posted Date:-2022-06-17 12:43:21
Unipolar, bipolar, and polar encoding are types of _______ encoding. a. line b. block c. NRZ d. Unipolar, bipolar, and polar encoding are types of _______ encoding.
1.line
2.block
3.NRZ
4. Manchester
Posted Date:-2022-06-17 12:56:53
_____ signals can have an infinite number of values in a range.
1.Analog
2.Digital
3.(a) or (b)
4.None of the above
Posted Date:-2022-06-17 11:55:24
A periodic signal completes one cycle in 0.001 s. What is the frequency?
1.1 Hz
2.100 Hz
3.1 KHz
4.1 MHz
Posted Date:-2022-06-17 11:20:27
A signal is measured at two different points. The power is P1 at the first point and P2 at the second point. The dB is 0. This means ________.
1.P2 is zero
2.P2 equals P1
3.P2 is much larger than P1
4.P2 is much smaller than P1
Posted Date:-2022-06-17 11:45:54
A sine wave in the ______ domain can be represented by one single spike in the _____ domain.
1.time; frequency
2.frequency; time
3.time; phase
4. phase; time
Posted Date:-2022-06-17 12:33:16
A(n)_________ signal is a composite analog signal with an infinite bandwidth.
1.digital
2.analog
3.either (a) or (b)
4.neither (a) nor (b)
Posted Date:-2022-06-17 12:36:25
As frequency increases, the period ________.
1.decreases
2.increases
3.remains the same
4.doubles
Posted Date:-2022-06-17 11:32:55
Baseband transmission of a digital signal is possible only if we have a ____ channel.
1.low-pass
2.bandpass
3.low rate
4.high rate
Posted Date:-2022-06-17 12:38:12
Baud means?
1.The number of bits transmitted per unit time
2.The number of byted transmitted per unit time
3.The rate at which the signal changes
4.None of the above
Posted Date:-2022-06-17 12:49:00
Before data can be transmitted, they must be transformed to ________.
1.periodic signals
2.electromagnetic signals
3.aperiodic signals
4.low-frequency sine waves
Posted Date:-2022-06-17 11:19:35
Data can be ________. d. none of the above
1.analog
2.digital
3.(a) or (b)
4.None of the above
Posted Date:-2022-06-17 11:51:29
Frequency and period are ______.
1.inverse of each other
2.proportional to each other
3.the same
4.None of the above
Posted Date:-2022-06-17 12:29:25
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.
1.one-half
2.twice
3.the same as
4. indeterminate from
Posted Date:-2022-06-17 11:34:34
If the available channel is a ____ channel, we cannot send a digital signal directly to the channel.
1. low-pass
2.bandpass
3. low rate
4.high rate
Posted Date:-2022-06-17 12:39:16
If the maximum amplitude of a sine wave is 2 V, the minimum amplitude is ________ V.
1.2
2.1
3.-2
4.between -2 and 2
Posted Date:-2022-06-17 11:45:00
In a frequency-domain plot, the horizontal axis measures the ________.
1.peak amplitude
2.frequency
3.phase
4.slope
Posted Date:-2022-06-17 11:26:12
In a time-domain plot, the horizontal axis is a measure of ________.
1.signal amplitude
2.frequency
3.phase
4.time
Posted Date:-2022-06-17 11:27:15
In asynchronous serial communication the physical layer provides
1.start and stop signalling
2.flow control
3.both (a) and (b)
4.None of the mentioned
Posted Date:-2022-06-17 12:47:07
physical layer provides
1.mechanical specifications of electrical connectors and cables
2.electrical specification of transmission line signal level
3.specification for IR over optical fiber
4.all of the mentioned
Posted Date:-2022-06-17 12:45:47
Signals can be ________.
1.analog
2.digital
3.either (a) or (b)
4.neither (a) nor (b)
Posted Date:-2022-06-17 11:54:25
The physical layer concerns with
1.bit-by-bit delivery
2.process to process delivery
3.application to application delivery
4.None of the above
Posted Date:-2022-06-17 11:22:04
The physical layer is responsible for
1.line coding
2.channel coding
3.modulation
4.all of the mentioned
Posted Date:-2022-06-17 12:47:57
The portion of physical layer that interfaces with the media access control sublayer is called
1.physical signalling sublayer
2.physical data sublayer
3.physical address sublayer
4.none of the mentioned
Posted Date:-2022-06-17 12:44:25
The _______ is the physical path over which a message travels.
1.Signal
2.Protocol
3.Medium
4.All of the above
Posted Date:-2022-06-17 11:18:30
Unipolar, bipolar, and polar encoding are types of _______ encoding.
1.line
2.block
3.NRZ
4.Manchester
Posted Date:-2022-06-17 12:53:30
What is the bandwidth of a signal that ranges from 1 MHz to 4 MHz?
1.4 MHz
2.1 KHz
3.3 MHz
4.None of the above
Posted Date:-2022-06-17 11:31:05
When propagation speed is multiplied by propagation time, we get the ________.
1.throughput
2.wavelength of the signal
3.distortion factor
4.distance a signal or bit has traveled
Posted Date:-2022-06-17 11:50:02
which of the following devices is used to connect different network segments and manage the traffic between them?
1.Bridge
2.Hub
3.Gateway
4.Repeater
Posted Date:-2022-06-17 12:52:29
Which of the following devices takes data sent from one network device and forwards it to all devices on the network regardless of the intended recipient?
1.DNS Server
2.Switch
3.Hub
4.Gateway
Posted Date:-2022-06-17 12:50:09
Which of the following devices takes data sent from one network device and forwards it to the destination node based on MAC address?
1.Hub
2.Switch
3.Gateway
4.Modem
Posted Date:-2022-06-17 12:51:26
__ is a type of transmission impairment in which an outside source such as crosstalk corrupts a signal.
1.Attenuation
2.Distortion
3.Noise
4.Decibel
Posted Date:-2022-06-17 11:49:05
__ is a type of transmission impairment in which the signal loses strength due to the different propagation speeds of each frequency that makes up the signal.
1.Attenuation
2.Distortion
3.Noise
4.Decibel
Posted Date:-2022-06-17 11:48:26
___ describes the position of the waveform relative to time 0.
1.Frequency
2.Phase
3.Amplitude
4.Voltage
Posted Date:-2022-06-17 12:32:20
______ can impair a signal.
1.Attenuation
2.Distortion
3.Noise
4.All of the above
Posted Date:-2022-06-17 12:42:30
_______ data are continuous and take continuous values.
1.analog
2.digital
3.(a) or (b)
4.None of the above
Posted Date:-2022-06-17 11:52:40
_______ data have discrete states and take discrete values.
1.Analog
2.Digital
3.(a) or (b)
4.None of the above
Posted Date:-2022-06-17 11:53:31
_______ encoding has a transition at the middle of each bit.
1.RZ
2.Manchester
3.Differential Manchester
4.All of the above
Posted Date:-2022-06-17 12:55:43
_______ is a type of transmission impairment in which the signal loses strength due to the resistance of the transmission medium.
1. Attenuation
2.Distortion
3.Noise
4.Decibel
Posted Date:-2022-06-17 11:47:00
_______ signals can have only a limited number of values.
1.Analog
2.Digital
3.(a) or (b)
4.None of the above
Posted Date:-2022-06-17 12:24:04
_______is the rate of change with respect to time.
1.Amplitude
2.Time
3.Frequency
4.Voltage
Posted Date:-2022-06-17 12:31:30