Question 1

Define digital 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 is stored or transmitted in the form of discrete signals, typically represented as binary code (0s and 1s). This can include text, images, audio, video, and any other type of information that can be represented digitally.

Most networks are now digital because digital transmission offers several advantages over analog transmission. Firstly, digital signals are less susceptible to noise and interference, which means that they can be transmitted over longer distances without degradation. Additionally, digital data can be easily compressed and manipulated, allowing for more efficient storage and transmission. Digital networks also have the ability to multiplex multiple signals onto a single transmission line, increasing the overall capacity and efficiency of the network. Furthermore, digital data can be easily encrypted and secured, providing a higher level of data protection. Finally, digital networks are more compatible with modern computing and communication technologies, making them more versatile and adaptable to changing needs.

Digital transmission is superior to analog for several reasons. Firstly, digital signals can be easily regenerated and amplified without loss of quality, whereas analog signals degrade over distance and require more complex and expensive equipment for regeneration. Secondly, digital signals can be easily manipulated and processed using digital signal processing techniques, allowing for more advanced error correction and data recovery. Thirdly, digital transmission allows for more efficient use of bandwidth, as multiple digital signals can be multiplexed onto a single transmission line. Additionally, digital data can be easily encrypted and secured, providing a higher level of data protection. Finally, digital networks are more compatible with modern computing and communication technologies, making them more versatile and adaptable to changing needs.

Question 2

In a multipoint circuit configuration, each computer can use the circuit at the same time.

Accepted Answer

A) True 
 B)False  False

Question 3

Which of the following media can best withstand harsh environmental conditions?

Accepted Answer

A) shielded twisted pair 
B) unshielded twisted pair 
C) Cat 5 twisted pair 
D) coaxial cable 
E) fiber optic cable 
A) shielded twisted pair 
B) unshielded twisted pair 
C) Cat 5 twisted pair 
D) coaxial cable 
E) fiber optic cable E

Question 4

ASCII is the least popular code for data communications.

Accepted Answer

A) True 
 B)False

Question 5

The acronym, Modem, stands for _________________.

Accepted Answer

A) multiplexing/demultiplexing 
B) more/demote 
C) Mode-M technique 
D) modulator/demodulator 
E) Mod emulation technique 
A) multiplexing/demultiplexing 
B) more/demote 
C) Mode-M technique 
D) modulator/demodulator 
E) Mod emulation technique

Question 6

An) __________ circuit is another name for a multipoint configuration.

Accepted Answer

A) analog 
B) dedicated 
C) point-to-point 
D) shared 
E) simplex 
A) analog 
B) dedicated 
C) point-to-point 
D) shared 
E) simplex

Question 7

Frequency modulation refers to the changing of the height of the sound wave.

Accepted Answer

A) True 
 B)False

Question 8

Which of the following statements is true?

Accepted Answer

A) the longer the distance of a telephone wire between sender and recipient, the lower the bandwidth across that wire 
B) the shorter the distance of a telephone wire between sender and recipient, the lower the bandwidth across that wire 
C) bandwidth is constant across any wire, therefore distance is not relevant to its capacity 
D) the longer the distance of a telephone wire between sender and recipient, the higher the bandwidth across that wire 
E) bandwidth is not a term that can be used when discussing telephone transmissions 
A) the longer the distance of a telephone wire between sender and recipient, the lower the bandwidth across that wire 
B) the shorter the distance of a telephone wire between sender and recipient, the lower the bandwidth across that wire 
C) bandwidth is constant across any wire, therefore distance is not relevant to its capacity 
D) the longer the distance of a telephone wire between sender and recipient, the higher the bandwidth across that wire 
E) bandwidth is not a term that can be used when discussing telephone transmissions

Question 9

Propagation delay is negligible with satellite transmission.

Accepted Answer

A) True 
 B)False

Question 10

Frequency division multiplexing divides the circuit into a set of different time slots.

Accepted Answer

A) True 
 B)False

Question 11

Wavelength division multiplexing can only used with copper cables.

Accepted Answer

A) True 
 B)False

Question 12

How does analog data differ from digital data?

Accepted Answer

Analog data and digital data represent t

Question 13

What is a modem? How does a modem send digital data on an analog network, explaining the process step by step?

Accepted Answer

A modem, short for modulator-demodulator

Question 14

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

Accepted Answer

A) True 
 B)False

Question 15

Data is physically transmitted from one computer or terminal to another in the ________ layer.

Accepted Answer

A) physical 
B) transport 
C) application 
D) terminal 
E) data link 
A) physical 
B) transport 
C) application 
D) terminal 
E) data link

Question 16

If you were buying a multiplexer, why would you choose either TDM or FDM?

Accepted Answer

When deciding between a Time Division Mu

Question 17

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 18

Ethernet uses

Accepted Answer

A) Manchester encoding 
B) Unipolar signaling 
C) Bipolar return to zero signaling 
D) Bipolar nonreturn to zero signaling 
E)  Manchester return to zero signaling 
A) Manchester encoding 
B) Unipolar signaling 
C) Bipolar return to zero signaling 
D) Bipolar nonreturn to zero signaling 
E)  Manchester return to zero signaling

Question 19

When you send an email from the US to Europe, it likely is transmitted from one continent to another through one of the ______ that connect America and Europe.

Accepted Answer

A) submarine cables 
B) satellites 
C) telephone lines 
D) boats 
E) modems 
A) submarine cables 
B) satellites 
C) telephone lines 
D) boats 
E) modems

Question 20

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

Define digital data.Explain why most networks are now digital.Why is digital transmission superior to analog? Give five reasons.

In a multipoint circuit configuration, each computer can use the circuit at the same time.

Which of the following media can best withstand harsh environmental conditions?

ASCII is the least popular code for data communications.

The acronym, Modem, stands for _________________.

An) __________ circuit is another name for a multipoint configuration.

Frequency modulation refers to the changing of the height of the sound wave.

Which of the following statements is true?

Propagation delay is negligible with satellite transmission.

Frequency division multiplexing divides the circuit into a set of different time slots.

Wavelength division multiplexing can only used with copper cables.

How does analog data differ from digital data?

What is a modem? How does a modem send digital data on an analog network, explaining the process step by step?

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

Data is physically transmitted from one computer or terminal to another in the ________ layer.

If you were buying a multiplexer, why would you choose either TDM or FDM?

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

Ethernet uses

When you send an email from the US to Europe, it likely is transmitted from one continent to another through one of the ______ that connect America and Europe.

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

Introduction to Data Communications

Application Layer

Data Link Layer

Network and Transport Layers

Network Design

Wired and Wireless Local Area Networks

Backbone Networks

Wide Area Networks

The Internet

Network Security

Network Management

Filters

Exam 3: Physical Layer

Define digital data.Explain why most networks are now digital.Why is digital transmission superior to analog? Give five reasons.

In a multipoint circuit configuration, each computer can use the circuit at the same time.

Which of the following media can best withstand harsh environmental conditions?

ASCII is the least popular code for data communications.

The acronym, Modem, stands for _________________.

An) __________ circuit is another name for a multipoint configuration.

Frequency modulation refers to the changing of the height of the sound wave.

Which of the following statements is true?

Propagation delay is negligible with satellite transmission.

Frequency division multiplexing divides the circuit into a set of different time slots.

Wavelength division multiplexing can only used with copper cables.

How does analog data differ from digital data?

What is a modem? How does a modem send digital data on an analog network, explaining the process step by step?

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

Data is physically transmitted from one computer or terminal to another in the ________ layer.

If you were buying a multiplexer, why would you choose either TDM or FDM?

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

Ethernet uses

When you send an email from the US to Europe, it likely is transmitted from one continent to another through one of the ______ that connect America and Europe.

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

Introduction to Data Communications

Application Layer

Data Link Layer

Network and Transport Layers

Network Design

Wired and Wireless Local Area Networks

Backbone Networks

Wide Area Networks

The Internet

Network Security

Network Management

Filters