Question 1

Under what circumstances would you use a microwave circuit rather than a satellite circuit?

Accepted Answer

Microwave circuits and satellite circuit

Question 2

Define analog, and then describe the conversion from analog to digital using a four step method sampling, measuring, quantizing and coding), and present a detailed diagram like the one which in the slides.What is quantizing error and how can it be lessened in some situations? Draw a sketch of quantizing error in your model.

Accepted Answer

Analog refers to a continuous signal tha

Question 3

Which of the following statements is correct?

Accepted Answer

A) Parallel transmission is most often used for sending data on a circuit that is made up of one wire. 
B) Parallel transmission is distinguished from serial transmission by the fact that the transmitting device sends a single bit, then a second bit, and so on, until all the bits are transmitted. 
C) Parallel transmission is only used for analog data. 
D) Serial transmission is slower than parallel transmission. 
E) Parallel transmission is the same as serial transmission. 
A) Parallel transmission is most often used for sending data on a circuit that is made up of one wire. 
B) Parallel transmission is distinguished from serial transmission by the fact that the transmitting device sends a single bit, then a second bit, and so on, until all the bits are transmitted. 
C) Parallel transmission is only used for analog data. 
D) Serial transmission is slower than parallel transmission. 
E) Parallel transmission is the same as serial transmission.

Question 4

The direction in which the sound wave begins is known as:

Accepted Answer

A) amplitude, which our ears detect as loudness 
B) frequency, which our ears detect as pitch 
C) phase 
D) bandwidth 
E) furlong 
A) amplitude, which our ears detect as loudness 
B) frequency, which our ears detect as pitch 
C) phase 
D) bandwidth 
E) furlong

Question 5

The type of media usually installed on homes and businesses by the telephone company is called ____________.

Accepted Answer

A) fiber optic cable 
B) coaxial cable 
C) twisted pair 
D) phone cable 
E) phone wire 
A) fiber optic cable 
B) coaxial cable 
C) twisted pair 
D) phone cable 
E) phone wire

Question 6

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

Question 7

Which of the following is not an important factor to consider when selecting media to be used in a network?

Accepted Answer

A) prestige value of the type of media 
B) type of network 
C) cost 
D) transmission distance 
E) security 
A) prestige value of the type of media 
B) type of network 
C) cost 
D) transmission distance 
E) security

Question 8

Computers produce digital data whose values are binary: 0 or 1.

Accepted Answer

A) True 
 B)False

Question 9

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

Accepted Answer

A) True 
 B)False

Question 10

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

Accepted Answer

A) True 
 B)False

Question 11

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 12

To get more "bandwidth" in a digital transmission, you must:

Accepted Answer

A) increase the range of frequencies available for a transmission 
B) increase the loudness per transmission 
C) decrease the bits per second transmission speed 
D) increase the phase shifts per transmission 
E) decrease the baud rate per transmission 
A) increase the range of frequencies available for a transmission 
B) increase the loudness per transmission 
C) decrease the bits per second transmission speed 
D) increase the phase shifts per transmission 
E) decrease the baud rate per transmission

Question 13

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 14

Compare and contrast Frequency Division Multiplexing FDM) and Wavelength Division Multiplexing WDM).

Accepted Answer

Frequency Division Multiplexing (FDM) an

Question 15

In which type of modulation is a 1 distinguished from a 0 by shifting the direction in which the wave begins?

Accepted Answer

A) bandwidth modulation 
B) amplitude modulation 
C) frequency modulation 
D) phase modulation 
E) codec modulation 
A) bandwidth modulation 
B) amplitude modulation 
C) frequency modulation 
D) phase modulation 
E) codec modulation

Question 16

______ is a modem standard that uses Lempel-Ziv encoding to compress data.

Accepted Answer

A) V.22 
B) V.44 
C) V.32bis 
D) V.34 
E) RS 232 
A) V.22 
B) V.44 
C) V.32bis 
D) V.34 
E) RS 232

Question 17

One way to reduce quantizing errors is to increase the sampling rate of the analog signal.

Accepted Answer

A) True 
 B)False

Question 18

How many bits are required to sample an incoming signal 4000 times per second using 64 different amplitude levels?

Accepted Answer

A) 64 
B) 32 
C) 16 
D) 8 
E) 6 
A) 64 
B) 32 
C) 16 
D) 8 
E) 6

Question 19

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

Accepted Answer

A) True 
 B)False

Question 20

Multitasking means to break one high-speed physical communication circuit into several lower-speed logical circuits so that different devices can simultaneously use it.

Accepted Answer

A) True 
 B)False

Under what circumstances would you use a microwave circuit rather than a satellite circuit?

Which of the following statements is correct?

The direction in which the sound wave begins is known as:

The type of media usually installed on homes and businesses by the telephone company is called ____________.

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

Which of the following is not an important factor to consider when selecting media to be used in a network?

Computers produce digital data whose values are binary: 0 or 1.

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

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

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

To get more "bandwidth" in a digital transmission, you must:

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

Compare and contrast Frequency Division Multiplexing FDM) and Wavelength Division Multiplexing WDM).

In which type of modulation is a 1 distinguished from a 0 by shifting the direction in which the wave begins?

______ is a modem standard that uses Lempel-Ziv encoding to compress data.

One way to reduce quantizing errors is to increase the sampling rate of the analog signal.

How many bits are required to sample an incoming signal 4000 times per second using 64 different amplitude levels?

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

Multitasking means to break one high-speed physical communication circuit into several lower-speed logical circuits so that different devices can simultaneously use it.

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

Under what circumstances would you use a microwave circuit rather than a satellite circuit?

Which of the following statements is correct?

The direction in which the sound wave begins is known as:

The type of media usually installed on homes and businesses by the telephone company is called ____________.

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

Which of the following is not an important factor to consider when selecting media to be used in a network?

Computers produce digital data whose values are binary: 0 or 1.

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

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

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

To get more "bandwidth" in a digital transmission, you must:

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

Compare and contrast Frequency Division Multiplexing FDM) and Wavelength Division Multiplexing WDM).

In which type of modulation is a 1 distinguished from a 0 by shifting the direction in which the wave begins?

______ is a modem standard that uses Lempel-Ziv encoding to compress data.

One way to reduce quantizing errors is to increase the sampling rate of the analog signal.

How many bits are required to sample an incoming signal 4000 times per second using 64 different amplitude levels?

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

Multitasking means to break one high-speed physical communication circuit into several lower-speed logical circuits so that different devices can simultaneously use it.

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