Question 1

A carrier wave is modulated with 4 amplitudes and 4 phase changes.How many possible signal combinations are there?

Accepted Answer

A) 4 
B) 8 
C) 16 
D) 32 
E) 64 
A) 4 
B) 8 
C) 16 
D) 32 
E) 64 C

Question 2

Analog signals are

Accepted Answer

A) continuous. 
B) discrete. 
C) discontinuous. 
D) Both A and B. 
E) Both B and C. 
A) continuous. 
B) discrete. 
C) discontinuous. 
D) Both A and B. 
E) Both B and C. A

Question 3

Each signal change or element is called a

Accepted Answer

A) bit. 
B) byte. 
C) baud. 
D) signal. 
E) digit. 
A) bit. 
B) byte. 
C) baud. 
D) signal. 
E) digit. C

Question 4

Analog encoding of digital information modulates a wave known as the
carrier in terms of its phase,frequency or amplitude.

Accepted Answer

A) True 
 B)False

Question 5

In order to compensate for synchronization problems,another type of encoding method called biphase can be employed.These methods place a clock pulse within the data stream.

Accepted Answer

A) True 
 B)False

Question 6

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

Accepted Answer

A) True 
 B)False

Question 7

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

Accepted Answer

A) input data. 
B) alternating current (A/
C) . 
C) pressure changes. 
D) electromagnetic signals. 
E) direct current (D/
C) . 
A) input data. 
B) alternating current (A/
C) . 
C) pressure changes. 
D) electromagnetic signals. 
E) direct current (D/
C) .

Question 8

Standards are important when devices must communicate together.The four characteristics governed by these standards are

Accepted Answer

A) mechanical,electrical,functional,and procedural. 
B) electrical,physical,functional,and signaling. 
C) fundamental,mechanical,procedural,and protocol. 
D) protocol,fundamental,physical,and signaling. 
E) physical,virtual,electrical,and functional. 
A) mechanical,electrical,functional,and procedural. 
B) electrical,physical,functional,and signaling. 
C) fundamental,mechanical,procedural,and protocol. 
D) protocol,fundamental,physical,and signaling. 
E) physical,virtual,electrical,and functional.

Question 9

An encoding scheme is used

Accepted Answer

A) in digital transmission to map binary digits to signal elements. 
B) in analog transmission to clean up the quality of the transmission. 
C) to help minimize errors. 
D) A,B,and C. 
E) A and B only. 
A) in digital transmission to map binary digits to signal elements. 
B) in analog transmission to clean up the quality of the transmission. 
C) to help minimize errors. 
D) A,B,and C. 
E) A and B only.

Question 10

Digital signals are

Accepted Answer

A) continuous. 
B) discrete. 
C) discontinuous. 
D) Both A and B. 
E) Both B and C. 
A) continuous. 
B) discrete. 
C) discontinuous. 
D) Both A and B. 
E) Both B and C.

Question 11

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

Accepted Answer

A) True 
 B)False

Question 12

It is difficult to use low frequencies for unguided radio transmission of data because the antenna dishes would have to be extremely large.

Accepted Answer

A) True 
 B)False

Question 13

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

Accepted Answer

A) it does not work well with serial communications. 
B) it is designed primarily for high speed communications only. 
C) the signal ground of the transmitter is often different from that of the receiver 
D) it works only for analog signals. 
E) it is sometimes difficult to synchronize the timing of the transmitter and the receiver. 
A) it does not work well with serial communications. 
B) it is designed primarily for high speed communications only. 
C) the signal ground of the transmitter is often different from that of the receiver 
D) it works only for analog signals. 
E) it is sometimes difficult to synchronize the timing of the transmitter and the receiver.

Question 14

An error detecting scheme that employs a unique prime number is called

Accepted Answer

A) parity checking. 
B) frame sequence checking. 
C) error checking and error correcting. 
D) cyclic redundancy check. 
E) synchronous redundancy check. 
A) parity checking. 
B) frame sequence checking. 
C) error checking and error correcting. 
D) cyclic redundancy check. 
E) synchronous redundancy check.

Question 15

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

Accepted Answer

A) 20 %. 
B) 30 %. 
C) 50 %. 
D) 70 %. 
E) 80 %. 
A) 20 %. 
B) 30 %. 
C) 50 %. 
D) 70 %. 
E) 80 %.

Question 16

Parity checking for error detection is most reliable for checking communications using high data rates.

Accepted Answer

A) True 
 B)False

Question 17

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

Accepted Answer

A) True 
 B)False

Question 18

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

Accepted Answer

A) True 
 B)False

Question 19

Identify each of the following as either analog or digital signals.Use A if analog and D if digital.
Whales
Human voice
Computer bus communication
Cellular telephones
Satellite transmission
T-1 circuits

Accepted Answer

Whales (A)
Human voice (A)
Com

Question 20

A carrier wave is modulated with 4 amplitudes and 4 phase changes.How many bits can be represented with each signal change?

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 4 
E) 5 
A) 1 
B) 2 
C) 3 
D) 4 
E) 5

A carrier wave is modulated with 4 amplitudes and 4 phase changes.How many possible signal combinations are there?

Analog signals are

Each signal change or element is called a

Analog encoding of digital information modulates a wave known as the carrier in terms of its phase,frequency or amplitude.

In order to compensate for synchronization problems,another type of encoding method called biphase can be employed.These methods place a clock pulse within the data stream.

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

Standards are important when devices must communicate together.The four characteristics governed by these standards are

An encoding scheme is used

Digital signals are

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

It is difficult to use low frequencies for unguided radio transmission of data because the antenna dishes would have to be extremely large.

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

An error detecting scheme that employs a unique prime number is called

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

Parity checking for error detection is most reliable for checking communications using high data rates.

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 changed to indicate the next binary digit.These binary digits can be represented by this signal change or a lack of signal change.

Identify each of the following as either analog or digital signals.Use A if analog and D if digital. Whales Human voice Computer bus communication Cellular telephones Satellite transmission T-1 circuits

A carrier wave is modulated with 4 amplitudes and 4 phase changes.How many bits can be represented with each signal change?

Introduction

Business Information

Distributed Data Processing

Internet History and Architecture

Tcp/ip and Osi

Clientserver and Intranet Computing

Internet-Based Applications

Internet Operation

Lan Architecture and Protocols

Ethernet and Fibre Channel

Wireless Lans

Circuit Switching and Packet Switching

Frame Relay and Atm

Wireless Wans

Data Transmission

Data Link Control and Multiplexing

Computer and Network Security Threats

Computer and Network Security Techniques

Network Management

Filters

Exam 16: Data Communication Fundamentals

A carrier wave is modulated with 4 amplitudes and 4 phase changes.How many possible signal combinations are there?

Analog signals are

Each signal change or element is called a

Analog encoding of digital information modulates a wave known as the carrier in terms of its phase,frequency or amplitude.

In order to compensate for synchronization problems,another type of encoding method called biphase can be employed.These methods place a clock pulse within the data stream.

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

Standards are important when devices must communicate together.The four characteristics governed by these standards are

An encoding scheme is used

Digital signals are

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

It is difficult to use low frequencies for unguided radio transmission of data because the antenna dishes would have to be extremely large.

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

An error detecting scheme that employs a unique prime number is called

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

Parity checking for error detection is most reliable for checking communications using high data rates.

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 changed to indicate the next binary digit.These binary digits can be represented by this signal change or a lack of signal change.

Identify each of the following as either analog or digital signals.Use A if analog and D if digital. Whales Human voice Computer bus communication Cellular telephones Satellite transmission T-1 circuits

A carrier wave is modulated with 4 amplitudes and 4 phase changes.How many bits can be represented with each signal change?

Introduction

Business Information

Distributed Data Processing

Internet History and Architecture

Tcp/ip and Osi

Clientserver and Intranet Computing

Internet-Based Applications

Internet Operation

Lan Architecture and Protocols

Ethernet and Fibre Channel

Wireless Lans

Circuit Switching and Packet Switching

Frame Relay and Atm

Wireless Wans

Data Transmission

Data Link Control and Multiplexing

Computer and Network Security Threats

Computer and Network Security Techniques

Network Management

Filters