Question 1

In a _________ , more than one data bit is changed by the error-causing condition.

Accepted Answer

A) burst error 
B) data rate shift 
C) Trellis-coded modulation 
D) uniform distribution 
E) amplitude key shift 
A) burst error 
B) data rate shift 
C) Trellis-coded modulation 
D) uniform distribution 
E) amplitude key shift

Question 2

Controlled access MAC approaches work better in a large network with high usage.

Accepted Answer

A) True 
 B)False

Question 3

Most computer networks managed by a host mainframe computer use contention media access control.

Accepted Answer

A) True 
 B)False

Question 4

What are three ways of reducing errors and the types of noise they affect?

Accepted Answer

Reducing errors and mitigating the effec

Question 5

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

Question 6

The probability of detecting an error, provided that one has occurred, using cyclic redundancy checking is about:

Accepted Answer

A) 75% 
B) 0% 
C) exactly 100% 
D) 50% 
E) > 99% 
A) 75% 
B) 0% 
C) exactly 100% 
D) 50% 
E) > 99%

Question 7

Compare and contrast stop-and-wait ARQ and continuous ARQ.

Accepted Answer

Stop-and-wait ARQ and continuous ARQ are

Question 8

Overhead bits are used for error checking and marking the start and end of characters and packets.

Accepted Answer

A) True 
 B)False

Question 9

Which of the following is true about the data link protocol, Ethernet IEEE 802.3)?

Accepted Answer

A) it is not very popular 
B) it is a bit-oriented protocol 
C) it uses block check characters for error detection 
D) newer version permits jumbo frames 
E) it uses parity bits for error detection 
A) it is not very popular 
B) it is a bit-oriented protocol 
C) it uses block check characters for error detection 
D) newer version permits jumbo frames 
E) it uses parity bits for error detection

Question 10

Crosstalk occurs when the signal transmitted on one circuit or channel of a transmission system creates an undesired effect in another circuit or channel.

Accepted Answer

A) True 
 B)False

Question 11

Errors on a network can occur:

Accepted Answer

A) only on dial-up type of circuits 
B) because of noise on the line 
C) only on poorly maintained networks 
D) only due to Gaussian noise 
E) only due to lightning strikes 
A) only on dial-up type of circuits 
B) because of noise on the line 
C) only on poorly maintained networks 
D) only due to Gaussian noise 
E) only due to lightning strikes

Question 12

Gaussian noise is a special type of attenuation.

Accepted Answer

A) True 
 B)False

Question 13

_________________ is defined as the total number of information bits divided by the total number of bits in the transmission.

Accepted Answer

A) Asynchronous rate 
B) Protocol percentage 
C) Throughput 
D) Transmission Rate of Information Bits 
E) Transmission efficiency 
A) Asynchronous rate 
B) Protocol percentage 
C) Throughput 
D) Transmission Rate of Information Bits 
E) Transmission efficiency

Question 14

On digital circuits, we use _________ to reshape the incoming signal and prevent attenuation.

Accepted Answer

A) amplifiers 
B) repeaters 
C) multiplexers 
D) digitizers 
E) modems 
A) amplifiers 
B) repeaters 
C) multiplexers 
D) digitizers 
E) modems

Question 15

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 16

____________ is not a function of a data link protocol.

Accepted Answer

A) Media access control 
B) Message delineation 
C) Amplitude shift keying 
D) Indicating when a message starts and stops 
E) Error control 
A) Media access control 
B) Message delineation 
C) Amplitude shift keying 
D) Indicating when a message starts and stops 
E) Error control

Question 17

The simplest method for error correction is retransmission.

Accepted Answer

A) True 
 B)False

Question 18

With odd parity assume that the parity bit in bold) has been placed at the end of each of the following) and a 7-bit ASCII code, which of the following is incorrect?

Accepted Answer

A) 01101011 
B) 00011011 
C) 00100101 
D) 10110110 
E) 11111110 
A) 01101011 
B) 00011011 
C) 00100101 
D) 10110110 
E) 11111110

Question 19

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 20

Which of the following is not a controlled access method of media access control?

Accepted Answer

A) Token passing 
B) CSMA/CD 
C) polling 
D) roll call polling 
E) hub polling 
A) Token passing 
B) CSMA/CD 
C) polling 
D) roll call polling 
E) hub polling

In a _________ , more than one data bit is changed by the error-causing condition.

Controlled access MAC approaches work better in a large network with high usage.

Most computer networks managed by a host mainframe computer use contention media access control.

What are three ways of reducing errors and the types of noise they affect?

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.

The probability of detecting an error, provided that one has occurred, using cyclic redundancy checking is about:

Compare and contrast stop-and-wait ARQ and continuous ARQ.

Overhead bits are used for error checking and marking the start and end of characters and packets.

Which of the following is true about the data link protocol, Ethernet IEEE 802.3)?

Crosstalk occurs when the signal transmitted on one circuit or channel of a transmission system creates an undesired effect in another circuit or channel.

Errors on a network can occur:

Gaussian noise is a special type of attenuation.

_________________ is defined as the total number of information bits divided by the total number of bits in the transmission.

On digital circuits, we use _________ to reshape the incoming signal and prevent attenuation.

____________ is not a function of a data link protocol.

The simplest method for error correction is retransmission.

With odd parity assume that the parity bit in bold) has been placed at the end of each of the following) and a 7-bit ASCII code, which of the following is incorrect?

The familiar background static on radios and telephones is called:

Which of the following is not a controlled access method of media access control?

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

In a _________ , more than one data bit is changed by the error-causing condition.

Controlled access MAC approaches work better in a large network with high usage.

Most computer networks managed by a host mainframe computer use contention media access control.

What are three ways of reducing errors and the types of noise they affect?

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.

The probability of detecting an error, provided that one has occurred, using cyclic redundancy checking is about:

Compare and contrast stop-and-wait ARQ and continuous ARQ.

Overhead bits are used for error checking and marking the start and end of characters and packets.

Which of the following is true about the data link protocol, Ethernet IEEE 802.3)?

Crosstalk occurs when the signal transmitted on one circuit or channel of a transmission system creates an undesired effect in another circuit or channel.

Errors on a network can occur:

Gaussian noise is a special type of attenuation.

_________________ is defined as the total number of information bits divided by the total number of bits in the transmission.

On digital circuits, we use _________ to reshape the incoming signal and prevent attenuation.

____________ is not a function of a data link protocol.

The simplest method for error correction is retransmission.

With odd parity assume that the parity bit in bold) has been placed at the end of each of the following) and a 7-bit ASCII code, which of the following is incorrect?

The familiar background static on radios and telephones is called:

Which of the following is not a controlled access method of media access control?

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