Question 1

Digital signals are:

Accepted Answer

A) continuous 
B) discrete 
C) discontinuous 
D) none of the above 
A) continuous 
B) discrete 
C) discontinuous 
D) none of the above B

Question 2

In an operation very similar to that performed by a modem,analog data can be represented by a digital signal; the device that performs this function is a ________.

Accepted Answer

codec

Question 3

________ data take on discrete values; examples are text,integers,and binary data.

Accepted Answer

Digital

Question 4

A _________ is a sequence of voltage pulses that may be transmitted over a wired medium; for example,a constant positive voltage may represent binary 0,and a constant negative value may represent binary 1.

Accepted Answer

The answer of A _________ is a sequence of voltage...

Question 5

The _________ is the most widely publicized of a family of modern technologies designed to provide high-speed digital data transmission over ordinary telephone wire.

Accepted Answer

asymmetric

Question 6

The data plus preamble,postamble,and control information are called a _________.

Accepted Answer

The answer of The data plus preamble,postamble,and control information are...

Question 7

Undetected and uncorrected errors can degrade performance and response times in any system that handles large volumes of data.

Accepted Answer

A) True 
 B)False

Question 8

Except for digital cellular telephones,copper wire is required for digital transmission.

Accepted Answer

A) True 
 B)False

Question 9

Each signal change or element is called a:

Accepted Answer

A) bit 
B) byte 
C) baud 
D) signal 
A) bit 
B) byte 
C) baud 
D) signal

Question 10

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 11

One of the main differences between amplifiers and repeaters is that:

Accepted Answer

A) amplifiers forward noise as well as data 
B) amplifiers clean the signal and then forward it 
C) amplifiers increase the amount of attenuation 
D) amplifiers focus primarily on digital signals 
A) amplifiers forward noise as well as data 
B) amplifiers clean the signal and then forward it 
C) amplifiers increase the amount of attenuation 
D) amplifiers focus primarily on digital signals

Question 12

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) all of the above 
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) all of the above

Question 13

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

Question 15

________ are electric or electromagnetic representations of data.

Accepted Answer

The answer of ________ are electric or electromagnetic representations of...

Question 16

An _________ is a continuously varying electromagnetic wave that may be transmitted over both guided and unguided media.

Accepted Answer

The answer of An _________ is a continuously varying electromagnetic...

Question 17

_________ data take on continuous values on some interval; for example,voice and video are continuously varying patterns of intensity.

Accepted Answer

The answer of _________ data take on continuous values on...

Question 18

The simplest approach to error detection is to append a parity bit to the end of a block of data.

Accepted Answer

A) True 
 B)False

Question 19

Asynchronous transmission includes a start and stop bit with each character transmitted to ensure:

Accepted Answer

A) that the total number of bits is a factor of 10 
B) to allow a continuous stream of data 
C) to prevent single bit errors from occurring 
D) to allow the receiver to maintain synchronization with the sender 
A) that the total number of bits is a factor of 10 
B) to allow a continuous stream of data 
C) to prevent single bit errors from occurring 
D) to allow the receiver to maintain synchronization with the sender

Question 20

________ is concerned with the content of the signal.

Accepted Answer

A) Digital transmission 
B) Analog transmission 
C) Digital signaling 
D) Analog signaling 
A) Digital transmission 
B) Analog transmission 
C) Digital signaling 
D) Analog signaling

Digital signals are:

In an operation very similar to that performed by a modem,analog data can be represented by a digital signal; the device that performs this function is a ________.

________ data take on discrete values; examples are text,integers,and binary data.

A _________ is a sequence of voltage pulses that may be transmitted over a wired medium; for example,a constant positive voltage may represent binary 0,and a constant negative value may represent binary 1.

The _________ is the most widely publicized of a family of modern technologies designed to provide high-speed digital data transmission over ordinary telephone wire.

The data plus preamble,postamble,and control information are called a _________.

Undetected and uncorrected errors can degrade performance and response times in any system that handles large volumes of data.

Except for digital cellular telephones,copper wire is required for digital transmission.

Each signal change or element is called a:

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.

One of the main differences between amplifiers and repeaters is that:

An encoding scheme is used:

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

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

________ are electric or electromagnetic representations of data.

An _________ is a continuously varying electromagnetic wave that may be transmitted over both guided and unguided media.

_________ data take on continuous values on some interval; for example,voice and video are continuously varying patterns of intensity.

The simplest approach to error detection is to append a parity bit to the end of a block of data.

Asynchronous transmission includes a start and stop bit with each character transmitted to ensure:

________ is concerned with the content of the signal.

Introduction

Business Information

Distributed Data Processing

Data Transmission

Data Link Control and Multiplexing

The Internet

Tcp / Ip

Client Server, intranet, and Cloud Computing

Internet-Based Applications

Internet Operation

Lan Architecture and Infrastructure

Ethernet, switches, and Virtual Lans

Wireless Lans

Wan Technology and Protocol

Wan Services

Wireless Lans

Computer and Network Security Threats

Computer and Network Security Techniques

Filters

Exam 5: Data Communication Fundamentals

Digital signals are:

In an operation very similar to that performed by a modem,analog data can be represented by a digital signal; the device that performs this function is a ________.

________ data take on discrete values; examples are text,integers,and binary data.

A _________ is a sequence of voltage pulses that may be transmitted over a wired medium; for example,a constant positive voltage may represent binary 0,and a constant negative value may represent binary 1.

The _________ is the most widely publicized of a family of modern technologies designed to provide high-speed digital data transmission over ordinary telephone wire.

The data plus preamble,postamble,and control information are called a _________.

Undetected and uncorrected errors can degrade performance and response times in any system that handles large volumes of data.

Except for digital cellular telephones,copper wire is required for digital transmission.

Each signal change or element is called a:

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.

One of the main differences between amplifiers and repeaters is that:

An encoding scheme is used:

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

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

________ are electric or electromagnetic representations of data.

An _________ is a continuously varying electromagnetic wave that may be transmitted over both guided and unguided media.

_________ data take on continuous values on some interval; for example,voice and video are continuously varying patterns of intensity.

The simplest approach to error detection is to append a parity bit to the end of a block of data.

Asynchronous transmission includes a start and stop bit with each character transmitted to ensure:

________ is concerned with the content of the signal.

Introduction

Business Information

Distributed Data Processing

Data Transmission

Data Link Control and Multiplexing

The Internet

Tcp / Ip

Client Server, intranet, and Cloud Computing

Internet-Based Applications

Internet Operation

Lan Architecture and Infrastructure

Ethernet, switches, and Virtual Lans

Wireless Lans

Wan Technology and Protocol

Wan Services

Wireless Lans

Computer and Network Security Threats

Computer and Network Security Techniques

Filters