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Exam 5: Data Communication Fundamentals

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Question 21

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The efficiency of an asynchronous transmission using 1 stop bit,1 start bit,and 1 parity bit is:

A) 20%
B) 30%
C) 50%
D) 70%

E) B) and D)
F) B) and C)

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Question 22

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With ________ transmission,a block of bits is transmitted in a steady stream without start and stop codes.

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Question 23

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A _______ modem permits Internet access over cable television networks.

Analog signals are less susceptible to noise interference and are more prone to attenuation than digital signals.

In modern communication systems,data is sent from one point to another via:

The process of error control involves two elements: error detection and _________.

Error detection requires that extra bits be introduced into the data stream.

Standards are important when devices must communicate together; the four characteristics governed by these standards are:

The mapping from binary digits to signal elements is the ________ scheme.

Synchronous serial transmissions are frame based,require the use of a preamble and are more efficient than asynchronous serial transmissions.

For amplitude,frequency or phase shift keying,that respective characteristic of the carrier wave is change to indicate the next binary digit; these binary digits can be represented by this signal change or a lack of signal change.

If a carrier wave is modulated with 4 amplitudes and 4 phase changes,how many possible signal combinations are there?

Analog signals are:

For sizable blocks of data,asynchronous transmission is far more efficient than synchronous.

When no character is being transmitted,the line between transmitter and receiver is in an idle state.

In Non Return to Zero encoding schemes,the signal or voltage level does not return to 0v (zero volts) ; one of the problems with this type of encoding is that:

Both analog and digital information can be encoded as either analog or digital signals.

Converting digital data to analog signals involves the use of a _________.

One of the least common error-detecting codes is the cyclic redundancy check.

__________ is the communication of data across a computer network by the propagation and processing of signals.