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WorksheetsICS620 MidTerm Study Quiz
Total questions: 142
Worksheet time: 1hrs 11mins
What are three important characteristics of a periodic signal _____ , ______ , and ______ ?
frequncy
amplitude
phase
error rate
What term is used to define signal loss or the gradual weakening of signal strength over distance?
(a)
What three key factors affect channel capacity _______ , _______ , and ______ ?
bandwidth
noise
signal
error rate
What type of signal repeats its' pattern over time?
(a)
Loosely and easily freed electrons make a good electrical (a) ?
A material with electron orbits that are very close to the nucleus will make it a good (a) .
According to Ohm's Law, the resistance increases when the device temperature (a) .
Frequency filtering (conversion of AC to DC) is where we use a ________ __________ __________.
(a)
We use a (a) circuit for frequency filtering.
The basic building block of any enterprise network infrastructure is the (a) line.
What physical medium is impervious to electromagnetic interference (EMI)?
(a)
What are the three key issues associated with the management of network security ______ , _______ , and _______ ?
confidentiality
availability
integrity
scalability
Data communications refers to virtually any form of information transfer other than (a) .
Voice communications looks to digitize approximately 10KHz of the sine wave associated with the information signal.
True
False
A data communications network that focus to on consolidating infrastructure for voice, data, and video services is known as (a) .
The type of data network commonly used on business premises (i.e., within a building or campus environment) is called a __________.
LAN
WAN
MAN
DAN
The type of network that geographically spans a state, region, country or the world is known as a ____________.
LAN
WAN
MAN
DAN
Three key benefits of IP network convergence are: ___________, ________________, _______________.
cost savings
transformation
effectiveness
security
Analog signals are more susceptible to noise.
True
False
A classic example of (a) switching is the telephone network.
In a (a) switching network data are transmitted in a sequence of small chunks that are passed through the network from switching node to switching node along some path leading from source to destination.
Static (a) is primarily used for cache memory.
A bit appended to an array of binary digits to make the sum of all the binary digits, always odd or always even is called:
(a)
A particular architecture may span many years and encompass a number of different computer models, its organization changing with changing technology.
True
False
A computer must be able to process, store, move, and control data.
True
False
Computer (a) refers to those attributes that have a direct impact on the logical execution of a program.
When data are moved over longer distances, to or from a remote device, the process is known as (a) .
Organizational attributes include hardware details transparent to the programmer.
True
False
A (a) device is referred to as a peripheral device.
(a) memory stores data.
The (a) moves data between the computer and its external environment.
(a) is historically less expensive than SRAM
(a) provide storage internal to the CPU.
The __________ performs the computer's mathematical functions.
CPU
Transistor
ALU
system buses
What is the general relationship between memory types for access time, cost, and capacity?
Faster access time, greater cost per bit
Slower access time, greater cost per bit
Faster access time, lesser cost per bit
Slower access time, lesser cost per bit
The four main structural components of the computer are:
CPU
main memory
I/O
system interconnection
ALU
For internal memory, the unit of transfer is ______________ the number of electrical lines into and out of the memory module.
greater than
equal to
less than
Internal memory capacity is typically expressed in terms of (a) .
A(n) (a) is generated by a failure such as power failure or memory parity error.
A (a) contains a permanent pattern of data that cannot be changed, is nonvolatile, and cannot have new data written into it.
A bus that connects major computer components (processor, memory, I/O) is called a (a) .
The data lines provide a path for moving data among system modules and are collectively called the (a) .
A (a) is the high-level set of rules for exchanging packets of data between devices.
The most common classes of interrupts are:
program
timer
I/O
hardware failure
CPU
Within the computer, a (a) manages the computer’s resources and orchestrates the performance of its functional parts in response to instructions.
The (a) lines are used to manage the access to and the use of the data and address lines.
The basic function of a______________ is to execute programs.
computer
CPU
ALU
system bus
Program execution consists of repeating the process of instruction fetch and instruction execution.
True
False
Interrupts improve processing efficiency.
True
False
An I/O module cannot exchange data directly with the processor.
True
False
In general, the ___________ devices attached to the bus, the ____________ the bus length and the greater the propagation delay.
more, greater
more, smaller
fewer, greater
fewer, smaller
It is impossible to connect I/O controllers directly onto the system bus.
True
False
The method of using the same bus lines for multiple purposes is known as time _________.
mulitplexing
modulation
key shifting
phase shifting
(a) refers to the way in which events are coordinated on the bus.
Virtually all contemporary computer designs are based on concepts developed by (a) at the Institute for Advanced Studies, Princeton.
An error-correcting code enhances the reliability of the memory at the cost of added complexity.
True
False
All ____________ require a refresh/battery charge to maintain operation.
RAMs
DRAMs
RRAMs
SRAMs
The processing required for a single instruction is called a(n) __________ cycle.
instruction
fetch
execution
Crosstalk is the unwanted coupling between signal paths.
True
False
___________ signals are used for analog and digital signals.
electromagnetic
noise
periodic
amplitude
The frequency of sampled human speech for digitizing has a range of ________________.
4000 Hz
4000 MHz
4000 mHz
4000 kHz
(a) is unwanted energy or signals on the transmission path.
Data can exist in either analog or (a) form.
In converting analog voice to digital transmission, companding is:
(a)
The throughput of a ________ is 64 kbps.
DS-0
DS-1
T1
T0
The __________ is the maximum height of the wave above or below a given reference point.
peak amplitude
frequency
period
phase
The _________ is the number of times the signal makes a complete cycle within a given time frame.
peak amplitude
frequency
phase
period
________ is a measure of the position of the waveform relative to a given moment of time within the period of a signal.
peak amplitude
phase
frequency
period
The (a) of a signal is defined as the distance between two points of corresponding phase of two consecutive cycles, such as maximum amplitudes or where the wave crosses zero.
The four categories of noise are:
thermal noise
crosstalk
intermodulation
impulse
interruption
The rate at which data can be transmitted over a given communication path, or channel, under given conditions, is referred to as the (a) .
The designer of a communications facility must deal with four factors: the bandwidth of the signal, the data rate that is used for digital information, the amount of noise and other impairments, and the level of (a) that is acceptable.v
In the encoding technique, _________ the phase of the carrier signal is shifted to encode data.
PSK
FSK
TDM
FDM
Digital information transmission is more:
(a)
___________ is used to keep alive a digital connection.
B8ZS
Analog signal
PSK
AMI
A (a) is a sequence of voltage pulses that may be transmitted over a wired medium; for example, a constant positive voltage may represent binary 1, and a constant negative value may represent binary 0.
The mapping from binary digits to signal elements is the (a) scheme.
With timing in a(n) ________ transmission, a block of bits is transmitted in a steady stream without start and stop codes.
synchronous
asynchronous
digital
analog
The process of error control in data transmission involves two primary elements: error correction and (a) .
More data can be placed on a signal in one of two ways by using(choose two answers):
more frequency
phase shifting
complex modulation
noise reduction
The four steps in sequential order required in converting an analog signal to a digital signal are _____ , _____ , _____ , and _____ .
sample, filter, quantize, encode
filter, sample, quantize, encode
encode, sample, quantize, filter
quantize, filter, encode sample
The ____________ Theorem requires sampling of the information signal at _____________ the highest frequency when converting an analog signal into digital information.
von Neumann, exactly
Nyquist, twice
Nyquist, quadruple
von Neumann, twice
In PCM, the MSB represents the (a) bit
In PCM, the four LSBs represents the (a) of the chord or segment.
In the encode scheme, (a) keying, digital information is transmitted through discrete frequency changes of the carrier wave.
(a) is used in digitizing an analog voice signal to improve the SNR.
Retransmission after timeout is a common technique for ____________.
noise cancellation
error control
phase shift keying
hardware failure
_______ is the most commonly used multiplexing technique and is was used in 1G mobile networking.
FDM
TDM
FSK
PSK
According the Nyquist Theorem, how often would a frequency bandwidth of 8000 Hz (8kHz) need to be sampled per second for minimum fidelity?
16000 Hz
8000 Hz
8000 kHz
4000 Hz
Line of Sight (LOS) transmission of radio frequencies is usually reliable for frequencies below 6 GHz.
True
False
The data transmitted by a synchronous TDM system are organized into ________, each of which contains a cycle of time slots.
frames
channels
phases
signals
The throughput of a _________ circuit is 1.544 Mbps.
DS-1
DS-0
T1
T2
Two types of multiplexing techniques most widely used are FDM and (a) .
_____________ noise refers to the rounding factor when digitizing a sampled point.
Quantize
Signal
Channel
Sample
What is modulated in AM signaling?
(a)
At what level of the OSI Model will you find a Router?
Level 1
Level 3
Level 5
Level 7
(a) pattern is the receiving antenna's equivalent to radiation pattern.
The Integration of visual intelligence is called (a) .
What are very low energy (spaces) in between main lobe and sidelobes called?
nulls
zeros
silence
cancellation
What are the key components of TV signal?
video
audio
color
signal
noise
Which is not one of the 4 factors of video signal transmission?
perception of the distribution of luminance
three-dimensional perspective
audio video compatibility
perception of color
This type of antenna has the signal amplitudes and phases to each antenna adjusted to create a directional pattern.
directional
vertical
dipole
parabolic
This type of antenna is designed to collect radiated energy that may be scattered in its transmission, the antenna is designed to reflect that energy back to one single collection point so it may be received in a manner that the signals that may be weak in transmission can be combined into a signal discernible signal and collect the information appropriately
parabolic reflective
vertical
dipole
directional
Which is NOT one of the 4 antennae:
isotropic
dipole
digital
directional
This type of propagation uses the ionosphere to bounce the signal back across the earth's atmosphere
skywave
line of sight
ground wave
refraction
What is the time required to scan all lines on a complete picture?
1/40 sec
1/30 sec
1/20 sec
1/10 sec
What is the relationship between antenna gain and effective area?
As wavelength increases, frequency decreases
As wavelength increases, frequency increases
As wavelength decreases, frequency decreases
What is the frame rate for the fields scanned?
60 Hz
30 Hz
1/60 sec
1/30 sec
_____________ __________ is the measure of directivity of antenna.
(a)
What is a graphical representation of radiation properties of an antenna?
Reception Pattern
Transmission Pattern
Radiation Pattern
Graphical Pattern
What are the three propagation modes of electromagnetic unguided signals?
ground-wave
sky-wave
line-of-sight propogation
ground propagation
What are the two types of coding used in digitizing television?
component
digital signal
composite
transmission
(a) are extra energy in directions outside the mainlobe.
Antenna radiation patterns can be directional and (a) .
The five basic propagation mechanisms are: free-space propagation, transmission, reflection, ________________, and _____________.
diffreaction
refraction
scattering
sequencing
What are the 4 types of antenna
isotropic
dipole
parabolic reflective
directional
omnidirectional
Video uses [a1], voice uses [a2]
[a1]=companding, [a2]=compression
[a1]=compression,[a2]=filters
[a1]=compression, [a2]=companding
[a1]=filters,[a2]=companding
The TV camera converts the scene into a(n) _____________ signal by transmitting a(n) ______________ of 1 V for black and 0 V for white.
electrical, voltage
analog,frequency
digital,voltage
electrical, frequency
This radiates electromagnetic energy into space
(a)
This type of antenna has the signal amplitudes and phases to each antenna adjusted to create a directional pattern
(a)
This type of antenna includes the halfwave dipole antenna and the quarterwave
(a)
This type of antenna is designed to collect radiated energy that may be scattered in its transmission, the antenna is designed to reflect that energy back to one single collection point so it may be received in a manner that the signals that may be weak in transmission can be combined into a signal discernible signal and collect the information appropriately
(a)
This type of antenna radiates power equally in all directions
isotropic
parabolic reflective
directional
dipole
This type of antenna radiation pattern has beam width in one direction
directional
omnidirectional
isotropic
dipole
This type of antenna radiation pattern is broadcasting in all directions with equal amount of energy
directional
omnidirectional
isotropic
dipole
This type of propagation follows the contour of the earth and can propagate considerable distances
(a)
This type of propagation is used for very high frequencies and the transmitting and receiving antennas must be within the
groundwave
line of sight
skywave
directional antenna
This covers the lines not scanned on the first period, offset 1/2 horizontal line (provides ability to see motion and depth)
single scan
second scan
full scan
double back
This is an electrical conductor or system of conductors that can also be defined as a passive device that does not add any energy to the signal but based off its resistance how it is coupled with a specific frequency and voltage to propagate a signal in either an omnidirectional or directional manner
(a)
This is the bending of microwaves by the atmosphere
reflection
refraction
transmission
interruption
This is the geographic size of that radiated pattern based off the type of antenna, height and frequency and power setting
(a)
(a) the phone company and PBX has the ability to only send his call to a local trunk and route it to that location. But if the line is busy then he gets a busy call tone.
This collects electromagnetic energy from space
reception
radiation
transmission
frequency
The _________ the number of scan lines, the higher the resolution and the _____________ the detail that can be observed
greater, greater
greater, lesser
fewer, greater
fewer, lesser
The process of scanning a scene a second time in such a way that its scan lines fall between those of the first field
first scanning
field scanning
second scanning
interlaced scanning
One complete scanning of the scene is called
(a)
_____________ offices are for the long distance carriers
PBX
Toll Exchange
DID
SS7
A transmission pathway between exchanges or central offices.
(a)
List 3 PBX features
Call routing, Call forwarding, Caller ID
call routing
call waiting
call forwarding
caller ID
PBX stands for...
Public Branch Exchange
Private Branch Exchange
Public Broad Extension
it's just PBX???
The power output in a particular direction, compared to that produced in any direction by an isotropic antenna
(a)
Name four different transmission mediums:
wire pair
air signal
coaxial cable
fiber optic cable
radio frequency
