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Question
Whereas traditional telephone networks allocate dedicated circuits for voice communications using circuit switching, VoIP uses _______, allowing the sharing of transmission capacity.Answer
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Related questions
Q:
The total collection of devices that receive broadcast frames from each other is referred to as a ________.
Q:
In the ________ topology the transmission medium is a branching cable with no closed loops.
A) bus
B) linear
C) ring
D) tree
Q:
In the ________ all stations attach directly to a linear transmission medium. A transmission from any station propagates the length of the medium in both directions and can be received by all other stations.
A) backend network
B) bus topology
C) tree topology
D) medium access link
Q:
The term ________ refers to the way in which the end points, or stations, attached to the network are interconnected.
A) control link
B) topology
C) medium
D) medium access link
Q:
The simplest approach to interconnecting multiple LANs within an organization is to use a ________.
A) hub
B) bridge
C) switch
D) gateway
Q:
A set of standards has not yet been defined for LANs that specify a range of data rates due to the variety of topologies and transmission media.
Q:
Orthogonal Frequency-Division Multiple Access employs multiple closely spaced subcarriers.
Q:
In OFDM all of the subcarriers are dedicated to a single data source.
Q:
Spatial diversity can be used when transmitting conditions are favorable and for relatively short distances compared to spatial multiplexing.
Q:
In a multipath scenario where each receiving antenna would experience a different interference environment, there is a high probability that if one antenna is suffering a high level of fading, another antenna has sufficient signal level.
Q:
Diverse multipath fading offers multiple views of the transmitted data at the receiver, thus increasing robustness.
Q:
________ uses one sideband and a reduced power carrier.
A) SSB
B) DBS
C) VSB
D) BTC
Q:
The _________ is the ratio of the amplitude of the input signal to the carrier.
A) modulation index
B) frequency phase
C) division rate
D) none of the above
Q:
Stop-and-wait flow control is more efficient than sliding-window flow control.
Q:
LDPC codes cannot be efficiently implemented for high-speed use.
Q:
The spectrum of the AM signal consists of the original carrier plus the spectrum of the input signal translated to fc.
Q:
TCP uses only a single type of protocol data unit called a ________.
Q:
When the system upon which a transport entity is running fails and subsequently restarts, the state information of all active connections is lost. The affected connections become ________ because the side that did not fail does not yet realize the problem.
Q:
A ________ timer is reset with each outgoing segment. If this timer ever expires the protocol entity is required to send a segment, even if it duplicates a previous one.
Q:
In addition to data each transmitted segment includes in its header three fields related to flow control: acknowledgment number, window, and ________.
Q:
It is necessary to impose a layer of control in each communicating device that provides functions such as flow control, error detection, and error control.
Q:
In ________ transmission each block of data is formatted as a frame that includes a starting and an ending flag.
A) parallel
B) asynchronous
C) analog
D) synchronous
Q:
A ________ error can occur in the presence of white noise when a slight random deterioration of the signal to noise ratio is sufficient to confuse the receiver's decision of a single bit.
A) burst
B) idle
C) single-bit
D) digital
Q:
________ is one of the most fundamental requirements in the transmission of a stream of bits from one device to another.
A) Standardization
B) Digitalization
C) Synchronization
D) Configuration
Q:
The ratio of data bits to total bits is called the code rate .
Q:
In an __________ , there is a cluster of bits in which a number of errors occur, although not necessarily all of the bits in the cluster suffer an error.
Q:
Forward error correction schemes are frequently used in __________ transmission, where retransmission schemes are highly inefficient and error rates may be high.
Q:
The ________ is a measure of how much additional bandwidth is required to carry data at the same data rate as without the code.
Q:
In the differential ________ scheme a binary 0 is represented by sending a signal burst of the same phase as the previous signal burst sent. A binary 1 is represented by sending a signal burst of opposite phase to the preceding one.
Q:
Multiple signals, each at a different position on the spectrum, sharing the same transmission medium, is known as frequency division ________.