Question 1

Digital transmission produces more errors than analog transmission.

Accepted Answer

A) True 
 B)False

Question 2

Guided media refers to the type of media in which the message is broadcast through the air.

Accepted Answer

A) True 
 B)False

Question 3

What is coding? Briefly describe the two most important coding schemes.

Accepted Answer

Coding is the process of creating instru

Question 4

A codec converts an incoming digital signal to an analog signal for transmission over an analog network.

Accepted Answer

A) True 
 B)False

Question 5

Describe two ways in which Statistical Time Division Multiplexing (STDM)differs from Time Division Multiplexing (TDM).

Accepted Answer

The answer of Describe two ways in which Statistical Time...

Question 6

Define digital data and draw a picture of it as compared to a picture of analog data.Explain why most networks are now digital.Why is digital transmission superior to analog? Give five reasons.

Accepted Answer

Digital data refers to information that

Question 7

A walkie-talkie is an example of half-duplex transmission.

Accepted Answer

A) True 
 B)False

Question 8

When all bits of a character are transferred one after another,the bits are transferred in ___________ mode.

Accepted Answer

A)  serial 
B)  frequency division 
C)  multiplexing 
D)  parallel 
E)  full complex 
A)  serial 
B)  frequency division 
C)  multiplexing 
D)  parallel 
E)  full complex

Question 9

Microwave transmissions require a line of sight between any two points.

Accepted Answer

A) True 
 B)False

Question 10

The physical layer is a layer where two communicating nodes are directly connected.

Accepted Answer

A) True 
 B)False

Question 11

Time division multiplexing is more efficient that frequency division multiplexing because the guardbands used in the frequency division multiplexing or not needed.

Accepted Answer

A) True 
 B)False

Question 12

Explain two reasons why the use of twisted pair cable is becoming more common than the use of coax cable?

Accepted Answer

There are two main reasons why the use o

Question 13

Digital Subscriber Line:

Accepted Answer

A)  is a fairly recent approach to provide higher data transmission rates across traditional voice circuits in the local loop 
B)  combines analog transmission and frequency division multiplexing 
C)  involves the use of a customer premises equipment (CP
E)  
D)  uses a combination of amplitude and phase modulation 
E)  all of the above 
A)  is a fairly recent approach to provide higher data transmission rates across traditional voice circuits in the local loop 
B)  combines analog transmission and frequency division multiplexing 
C)  involves the use of a customer premises equipment (CP
E)  
D)  uses a combination of amplitude and phase modulation 
E)  all of the above

Question 14

Digital transmission permits higher maximum transmission rates when compared to analog.

Accepted Answer

A) True 
 B)False

Question 15

Which of the following is a characteristic of sound waves that can be modulated to convert digital data into analog signals?

Accepted Answer

A)  phase 
B)  attenuation 
C)  bipolar 
D)  bandwidth 
E)  codec 
A)  phase 
B)  attenuation 
C)  bipolar 
D)  bandwidth 
E)  codec

Question 16

The typical range of human hearing is:

Accepted Answer

A)  0 to 4,000 Hz 
B)  0 to 1,200 Hz 
C)  20 to 14,000 Hz 
D)  0 to 300 Hz 
E)  0 to 56,000 Hz 
A)  0 to 4,000 Hz 
B)  0 to 1,200 Hz 
C)  20 to 14,000 Hz 
D)  0 to 300 Hz 
E)  0 to 56,000 Hz

Question 17

________________ separate channels to reduce interference between channels in frequency division multiplexing.

Accepted Answer

A)  Channel blockers 
B)  Statistical dividers 
C)  Attenuators 
D)  Guardbands 
E)  Adaptive differential processors 
A)  Channel blockers 
B)  Statistical dividers 
C)  Attenuators 
D)  Guardbands 
E)  Adaptive differential processors

Question 18

The _____________ of a circuit determines a circuit's capacity.

Accepted Answer

A)  frequency 
B)  bandwidth 
C)  phase 
D)  amplitude 
E)  loudness 
A)  frequency 
B)  bandwidth 
C)  phase 
D)  amplitude 
E)  loudness

Question 19

____________ is used by IM and other applications that provide voice services over lower-speed digital circuits.

Accepted Answer

A)  pulse code modulation 
B)  adaptive differential pulse code modulation 
C)  Voice conversation 
D)  code modulation 
E)  phase modulation 
A)  pulse code modulation 
B)  adaptive differential pulse code modulation 
C)  Voice conversation 
D)  code modulation 
E)  phase modulation

Question 20

Wavelength division multiplexing can only used with copper cables.

Accepted Answer

A) True 
 B)False

Digital transmission produces more errors than analog transmission.

Guided media refers to the type of media in which the message is broadcast through the air.

What is coding? Briefly describe the two most important coding schemes.

A codec converts an incoming digital signal to an analog signal for transmission over an analog network.

Describe two ways in which Statistical Time Division Multiplexing (STDM)differs from Time Division Multiplexing (TDM).

Define digital data and draw a picture of it as compared to a picture of analog data.Explain why most networks are now digital.Why is digital transmission superior to analog? Give five reasons.

A walkie-talkie is an example of half-duplex transmission.

When all bits of a character are transferred one after another,the bits are transferred in ___________ mode.

Microwave transmissions require a line of sight between any two points.

The physical layer is a layer where two communicating nodes are directly connected.

Time division multiplexing is more efficient that frequency division multiplexing because the guardbands used in the frequency division multiplexing or not needed.

Explain two reasons why the use of twisted pair cable is becoming more common than the use of coax cable?

Digital Subscriber Line:

Digital transmission permits higher maximum transmission rates when compared to analog.

Which of the following is a characteristic of sound waves that can be modulated to convert digital data into analog signals?

The typical range of human hearing is:

________________ separate channels to reduce interference between channels in frequency division multiplexing.

The _____________ of a circuit determines a circuit's capacity.

____________ is used by IM and other applications that provide voice services over lower-speed digital circuits.

Wavelength division multiplexing can only used with copper cables.

Introduction to Data Communications

Application Layer

Data Link Layer

Network and Transport Layers

Wired and Wireless LANs

Backbone Networks

Wide Area Networks

The Internet

Network Security

Network Design

Network Management

Filters

Exam 3: Physical Layer

Digital transmission produces more errors than analog transmission.

Guided media refers to the type of media in which the message is broadcast through the air.

What is coding? Briefly describe the two most important coding schemes.

A codec converts an incoming digital signal to an analog signal for transmission over an analog network.

Describe two ways in which Statistical Time Division Multiplexing (STDM)differs from Time Division Multiplexing (TDM).

Define digital data and draw a picture of it as compared to a picture of analog data.Explain why most networks are now digital.Why is digital transmission superior to analog? Give five reasons.

A walkie-talkie is an example of half-duplex transmission.

When all bits of a character are transferred one after another,the bits are transferred in ___________ mode.

Microwave transmissions require a line of sight between any two points.

The physical layer is a layer where two communicating nodes are directly connected.

Time division multiplexing is more efficient that frequency division multiplexing because the guardbands used in the frequency division multiplexing or not needed.

Explain two reasons why the use of twisted pair cable is becoming more common than the use of coax cable?

Digital Subscriber Line:

Digital transmission permits higher maximum transmission rates when compared to analog.

Which of the following is a characteristic of sound waves that can be modulated to convert digital data into analog signals?

The typical range of human hearing is:

________________ separate channels to reduce interference between channels in frequency division multiplexing.

The _____________ of a circuit determines a circuit's capacity.

____________ is used by IM and other applications that provide voice services over lower-speed digital circuits.

Wavelength division multiplexing can only used with copper cables.

Introduction to Data Communications

Application Layer

Data Link Layer

Network and Transport Layers

Wired and Wireless LANs

Backbone Networks

Wide Area Networks

The Internet

Network Security

Network Design

Network Management

Filters