Question 1

Digital signaling usually means that the information being conveyed is binary.

Accepted Answer

A) True 
 B)False  True

Question 2

Refraction refers to the bending of the signal.

Accepted Answer

A) True 
 B)False  True

Question 3

A sine wave is a periodic signal that

Accepted Answer

A) has equal phase,frequency and amplitude. 
B) can be either digital or analog. 
C) has a maximum peak amplitude equal to it's frequency. 
D) has a frequency that is less than its amplitude. 
E) can be measured in terms of it's amplitude,frequency and phase. 
A) has equal phase,frequency and amplitude. 
B) can be either digital or analog. 
C) has a maximum peak amplitude equal to it's frequency. 
D) has a frequency that is less than its amplitude. 
E) can be measured in terms of it's amplitude,frequency and phase. E

Question 4

Given a frequency of 1000 Hz and a speed of 3X108 m/s (speed of light)what is the wavelength of the signal?

Accepted Answer

A) 1000 m 
B) 3 m 
C) 3x108 m 
D) 3x105 m 
E) 3x103 m 
A) 1000 m 
B) 3 m 
C) 3x108 m 
D) 3x105 m 
E) 3x103 m

Question 5

The bandwidth of a signal is

Accepted Answer

A) the width of the spectrum. 
B) the average of the frequencies. 
C) the range of frequencies in the signal. 
D) the maximum amplitude of the signal. 
E) the minimum amplitude in the signal. 
A) the width of the spectrum. 
B) the average of the frequencies. 
C) the range of frequencies in the signal. 
D) the maximum amplitude of the signal. 
E) the minimum amplitude in the signal.

Question 6

Attenuation is greater at lower frequencies.

Accepted Answer

A) True 
 B)False

Question 7

In order to completely compensate for attenuation,the signal generated must be at least as high in strength than the noise of the channel

Accepted Answer

A) True 
 B)False

Question 8

Electromagnetic signals

Accepted Answer

A) are used only for optics. 
B) are used for analog and digital signals. 
C) are used for digital signals only. 
D) are used for analog signals only. 
E) are used for both optics and digital signals. 
A) are used only for optics. 
B) are used for analog and digital signals. 
C) are used for digital signals only. 
D) are used for analog signals only. 
E) are used for both optics and digital signals.

Question 9

Attenuation is the reduction in signal strength as the signal propagates down the transmission path.

Accepted Answer

A) True 
 B)False

Question 10

The loudness of a signal is measured by its amplitude.

Accepted Answer

A) True 
 B)False

Question 11

In the telephone system,conversations are reproduced using the range from 300-3400 Hz in order to limit the required capacity of transmission lines.

Accepted Answer

A) True 
 B)False

Question 12

Multipath problems are particularly problematic in line of sight applications.

Accepted Answer

A) True 
 B)False

Question 13

Atmospheric absorption occurs because of

Accepted Answer

A) the distances traversed in atmospheric transmission. 
B) the water and oxygen content. 
C) pollution and carbon content. 
D) nitrogen content. 
E) the ozone layer. 
A) the distances traversed in atmospheric transmission. 
B) the water and oxygen content. 
C) pollution and carbon content. 
D) nitrogen content. 
E) the ozone layer.

Question 14

In general,noise can be defined as

Accepted Answer

A) loud,high amplitude signals. 
B) errors in transmission. 
C) signals generated by internetworking equipment. 
D) analog signals instead of digital. 
E) unwanted energy or signals on the transmission path. 
A) loud,high amplitude signals. 
B) errors in transmission. 
C) signals generated by internetworking equipment. 
D) analog signals instead of digital. 
E) unwanted energy or signals on the transmission path.

Question 15

The frequency of human speech is in the range of

Accepted Answer

A) 20-1000 Hz. 
B) 20-3400 Hz. 
C) 300-3400 Hz. 
D) 20-20,000 Hz. 
E) 10-25,000 Hz. 
A) 20-1000 Hz. 
B) 20-3400 Hz. 
C) 300-3400 Hz. 
D) 20-20,000 Hz. 
E) 10-25,000 Hz.

Question 16

Because of it's characteristics,free space loss is a particular problems in

Accepted Answer

A) microwave tower transmissions. 
B) wide area network transmissions. 
C) dial up or modem transmissions. 
D) satellite transmissions 
E) LANs 
A) microwave tower transmissions. 
B) wide area network transmissions. 
C) dial up or modem transmissions. 
D) satellite transmissions 
E) LANs

Question 17

Given a resolution of 320 pixels x 240 pixels,1 byte of color information per pixel and a transmission rate of 30 frames per second,calculate the bandwidth necessary for this signal

Accepted Answer

A) 18.4 Mbps 
B) 2.3 Mbps 
C) 18.4 Kbps 
D) 6 Mbps 
E) 4 Mbps 
A) 18.4 Mbps 
B) 2.3 Mbps 
C) 18.4 Kbps 
D) 6 Mbps 
E) 4 Mbps

Question 18

Referring to Shannon's equation,in order to increase the data rate of a signal,we need only increase the bandwidth.

Accepted Answer

A) True 
 B)False

Question 19

Analog signals differ from digital signals in that

Accepted Answer

A) analog signals are represented vs.time while digital signals are measured vs.frequency. 
B) analog signals are periodic,digital signals are not. 
C) analog signals are continuous while digital signals remain at one constant level and then move to another constant level. 
D) analog signals operate a higher frequencies than digital signals. 
E) digital signals operate at higher frequencies than analog signals. 
A) analog signals are represented vs.time while digital signals are measured vs.frequency. 
B) analog signals are periodic,digital signals are not. 
C) analog signals are continuous while digital signals remain at one constant level and then move to another constant level. 
D) analog signals operate a higher frequencies than digital signals. 
E) digital signals operate at higher frequencies than analog signals.

Question 20

The spectrum of a signal is

Accepted Answer

A) the lowest frequency value subtracted from the highest . 
B) the range of frequencies in the signal. 
C) all of the frequencies from 0 to the highest frequency used. 
D) the average of the highest frequency and the lowest. 
E) the average of the lowest frequency used. 
A) the lowest frequency value subtracted from the highest . 
B) the range of frequencies in the signal. 
C) all of the frequencies from 0 to the highest frequency used. 
D) the average of the highest frequency and the lowest. 
E) the average of the lowest frequency used.

Digital signaling usually means that the information being conveyed is binary.

Refraction refers to the bending of the signal.

A sine wave is a periodic signal that

Given a frequency of 1000 Hz and a speed of 3X108 m/s (speed of light)what is the wavelength of the signal?

The bandwidth of a signal is

Attenuation is greater at lower frequencies.

In order to completely compensate for attenuation,the signal generated must be at least as high in strength than the noise of the channel

Electromagnetic signals

Attenuation is the reduction in signal strength as the signal propagates down the transmission path.

The loudness of a signal is measured by its amplitude.

In the telephone system,conversations are reproduced using the range from 300-3400 Hz in order to limit the required capacity of transmission lines.

Multipath problems are particularly problematic in line of sight applications.

Atmospheric absorption occurs because of

In general,noise can be defined as

The frequency of human speech is in the range of

Because of it's characteristics,free space loss is a particular problems in

Given a resolution of 320 pixels x 240 pixels,1 byte of color information per pixel and a transmission rate of 30 frames per second,calculate the bandwidth necessary for this signal

Referring to Shannon's equation,in order to increase the data rate of a signal,we need only increase the bandwidth.

Analog signals differ from digital signals in that

The spectrum of a signal is

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Exam 15: Data Transmission

Digital signaling usually means that the information being conveyed is binary.

Refraction refers to the bending of the signal.

A sine wave is a periodic signal that

Given a frequency of 1000 Hz and a speed of 3X108 m/s (speed of light)what is the wavelength of the signal?

The bandwidth of a signal is

Attenuation is greater at lower frequencies.

In order to completely compensate for attenuation,the signal generated must be at least as high in strength than the noise of the channel

Electromagnetic signals

Attenuation is the reduction in signal strength as the signal propagates down the transmission path.

The loudness of a signal is measured by its amplitude.

In the telephone system,conversations are reproduced using the range from 300-3400 Hz in order to limit the required capacity of transmission lines.

Multipath problems are particularly problematic in line of sight applications.

Atmospheric absorption occurs because of

In general,noise can be defined as

The frequency of human speech is in the range of

Because of it's characteristics,free space loss is a particular problems in

Given a resolution of 320 pixels x 240 pixels,1 byte of color information per pixel and a transmission rate of 30 frames per second,calculate the bandwidth necessary for this signal

Referring to Shannon's equation,in order to increase the data rate of a signal,we need only increase the bandwidth.

Analog signals differ from digital signals in that

The spectrum of a signal is

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 Communication Fundamentals

Data Link Control and Multiplexing

Computer and Network Security Threats

Computer and Network Security Techniques

Network Management

Filters