Question 1

Cyclical redundancy check is one of the most popular polynomial error-checking schemes.

Accepted Answer

A) True 
 B)False  True

Question 2

In ARQ, a NAK:

Accepted Answer

A) is sent by the recipient if the message was received without error 
B) is sent by the sender at the same time as it sends a data packet 
C) is sent by the recipient if the message contains an error 
D) refers to non-asynchronous Kermit technique 
E) means that the sender should continue with sending the next message 
A) is sent by the recipient if the message was received without error 
B) is sent by the sender at the same time as it sends a data packet 
C) is sent by the recipient if the message contains an error 
D) refers to non-asynchronous Kermit technique 
E) means that the sender should continue with sending the next message C

Question 3

Token passing is a term that refers to hub polling, in which one computer starts a poll and passes it to the next computer on a multipoint circuit.

Accepted Answer

A) True 
 B)False  True

Question 4

Which of the following is way to reduce or eliminate crosstalk on a circuit?

Accepted Answer

A) physically separating the cables from other communication cables 
B) adding repeaters or amplifiers to a circuit 
C) reducing the length of the cable 
D) adding fluorescent lights 
E) shorting a circuit 
A) physically separating the cables from other communication cables 
B) adding repeaters or amplifiers to a circuit 
C) reducing the length of the cable 
D) adding fluorescent lights 
E) shorting a circuit

Question 5

_____________ is an effective way to prevent attenuation.

Accepted Answer

A) Shielding wires 
B) Adding fluorescent lights 
C) Adding repeaters or amplifiers to a circuit 
D) Changing multiplexing techniques 
E) Shorting a circuit 
A) Shielding wires 
B) Adding fluorescent lights 
C) Adding repeaters or amplifiers to a circuit 
D) Changing multiplexing techniques 
E) Shorting a circuit

Question 6

With contention, a computer does not have to wait before it can transmit.A computer can transmit at anytime.

Accepted Answer

A) True 
 B)False

Question 7

____________ refers to bits that have been changed, in error, from 1 to 0, or vice versa, in a data transmission.

Accepted Answer

A) Contracted bits 
B) Polled bits 
C) Inverse multiplexed bits 
D) Flipped bits 
E) Bit delineation 
A) Contracted bits 
B) Polled bits 
C) Inverse multiplexed bits 
D) Flipped bits 
E) Bit delineation

Question 8

In an odd parity-checking scheme, the parity bit is set to make the total number of ones in the byte including the parity bit) an even number.

Accepted Answer

A) True 
 B)False

Question 9

Think about a recent world impact event and how useful the technologies of communications might have been related to helping people impacted by that event Hurricane Katrina, Pakistan earthquakes, or some other large world event).How might telecom have a positive role in large scale human events? Use insight gained from the technological underpinnings provided in the course.Be creative.

Accepted Answer

One recent world impact event where the

Question 10

What is asynchronous transmission v.synchronous transmission? Describe one protocol of each type.

Accepted Answer

Asynchronous transmission and synchronou

Question 11

Describe continuous ARQ.

Accepted Answer

Continuous Automatic Repeat reQuest (ARQ

Question 12

Media access controls refer to the need to control when computers transmit.

Accepted Answer

A) True 
 B)False

Question 13

__________can obliterate a group of bits, causing a burst error.

Accepted Answer

A) Cross-talk 
B) Attenuation 
C) Impulse noise 
D) Intermodulation noise 
E) White noise 
A) Cross-talk 
B) Attenuation 
C) Impulse noise 
D) Intermodulation noise 
E) White noise

Question 14

When the signals from two circuits combine to form a new signal that falls into a frequency band reserved for another signal, this is called intermodulation noise.

Accepted Answer

A) True 
 B)False

Question 15

Describe from a high level perspective the packet layout for SDLC, Ethernet, and PPP.

Accepted Answer

The packet layout for SDLC (Synchronous

Question 16

The familiar background static on radios and telephones is called:

Accepted Answer

A) echoes 
B) intermodulation noise 
C) impulse noise 
D) cross-talk 
E) white noise 
A) echoes 
B) intermodulation noise 
C) impulse noise 
D) cross-talk 
E) white noise

Question 17

Errors normally appear in ______________________________, which is when more than one data bit is changed by the error-causing condition.Is there any difference in the error rates of lower speed lines and of higher speed lines? What kinds of lines are more prone to errors?

Accepted Answer

Errors normally appear in data transmiss

Question 18

__________ is a software-enabled technique that can change the hardcoded MAC address to any MAC address and thus overcome MAC address filtering.

Accepted Answer

A) MAC address spoofing 
B) MAC address engaging 
C) Ethernet address regeneration 
D) Address regeneration 
E) MAC address cheesing 
A) MAC address spoofing 
B) MAC address engaging 
C) Ethernet address regeneration 
D) Address regeneration 
E) MAC address cheesing

Question 19

Another term for continuous ARQ is sliding window.

Accepted Answer

A) True 
 B)False

Question 20

The physical and data link layers of wired Ethernet have been refined over the years as a collection of standards under the IEEE 802.3 workgroup.

Accepted Answer

A) True 
 B)False

Cyclical redundancy check is one of the most popular polynomial error-checking schemes.

In ARQ, a NAK:

Token passing is a term that refers to hub polling, in which one computer starts a poll and passes it to the next computer on a multipoint circuit.

Which of the following is way to reduce or eliminate crosstalk on a circuit?

_____________ is an effective way to prevent attenuation.

With contention, a computer does not have to wait before it can transmit.A computer can transmit at anytime.

____________ refers to bits that have been changed, in error, from 1 to 0, or vice versa, in a data transmission.

In an odd parity-checking scheme, the parity bit is set to make the total number of ones in the byte including the parity bit) an even number.

What is asynchronous transmission v.synchronous transmission? Describe one protocol of each type.

Describe continuous ARQ.

Media access controls refer to the need to control when computers transmit.

__________can obliterate a group of bits, causing a burst error.

When the signals from two circuits combine to form a new signal that falls into a frequency band reserved for another signal, this is called intermodulation noise.

Describe from a high level perspective the packet layout for SDLC, Ethernet, and PPP.

The familiar background static on radios and telephones is called:

Errors normally appear in ______________________________, which is when more than one data bit is changed by the error-causing condition.Is there any difference in the error rates of lower speed lines and of higher speed lines? What kinds of lines are more prone to errors?

__________ is a software-enabled technique that can change the hardcoded MAC address to any MAC address and thus overcome MAC address filtering.

Another term for continuous ARQ is sliding window.

The physical and data link layers of wired Ethernet have been refined over the years as a collection of standards under the IEEE 802.3 workgroup.

Introduction to Data Communications

Application Layer

Physical 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 4: Data Link Layer

Cyclical redundancy check is one of the most popular polynomial error-checking schemes.

In ARQ, a NAK:

Token passing is a term that refers to hub polling, in which one computer starts a poll and passes it to the next computer on a multipoint circuit.

Which of the following is way to reduce or eliminate crosstalk on a circuit?

_____________ is an effective way to prevent attenuation.

With contention, a computer does not have to wait before it can transmit.A computer can transmit at anytime.

____________ refers to bits that have been changed, in error, from 1 to 0, or vice versa, in a data transmission.

In an odd parity-checking scheme, the parity bit is set to make the total number of ones in the byte including the parity bit) an even number.

What is asynchronous transmission v.synchronous transmission? Describe one protocol of each type.

Describe continuous ARQ.

Media access controls refer to the need to control when computers transmit.

__________can obliterate a group of bits, causing a burst error.

When the signals from two circuits combine to form a new signal that falls into a frequency band reserved for another signal, this is called intermodulation noise.

Describe from a high level perspective the packet layout for SDLC, Ethernet, and PPP.

The familiar background static on radios and telephones is called:

Errors normally appear in ______________________________, which is when more than one data bit is changed by the error-causing condition.Is there any difference in the error rates of lower speed lines and of higher speed lines? What kinds of lines are more prone to errors?

__________ is a software-enabled technique that can change the hardcoded MAC address to any MAC address and thus overcome MAC address filtering.

Another term for continuous ARQ is sliding window.

The physical and data link layers of wired Ethernet have been refined over the years as a collection of standards under the IEEE 802.3 workgroup.

Introduction to Data Communications

Application Layer

Physical 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