Question 1

With roll-call polling, a server polls clients in a consecutive, pre-arranged priority list.

Accepted Answer

A) True 
 B)False

Question 2

Describe three approaches to detecting errors, including how they work, the probability of detecting an error, and any other benefits or limitations.

Accepted Answer

1. Checksums: This approach involves add

Question 3

Optical media is:

Accepted Answer

A) more likely to suffer from noise than electrical media 
B) has about the same likelihood of suffering from noise as electrical media 
C) has about the same likelihood of suffering from noise as coaxial cable 
D) less likely to suffer from noise than electrical media 
E) more prone to noise than twisted pair media 
A) more likely to suffer from noise than electrical media 
B) has about the same likelihood of suffering from noise as electrical media 
C) has about the same likelihood of suffering from noise as coaxial cable 
D) less likely to suffer from noise than electrical media 
E) more prone to noise than twisted pair media

Question 4

ARQ means that:

Accepted Answer

A) a receiver that detects an error in a message simply asks the sender to retransmit the message until it is received without error 
B) the common carrier Automatically Returns Queries to the subscriber upon receipt of such queries 
C) a sender is using a data link protocol called Asynchronous Repeating reQuest 
D) a fiber optic cable meets the American Registered Quality, a certification standard for use in high-quality data communication transmission lines 
E) a sender is using a parity scheme called Array Resource Quality 
A) a receiver that detects an error in a message simply asks the sender to retransmit the message until it is received without error 
B) the common carrier Automatically Returns Queries to the subscriber upon receipt of such queries 
C) a sender is using a data link protocol called Asynchronous Repeating reQuest 
D) a fiber optic cable meets the American Registered Quality, a certification standard for use in high-quality data communication transmission lines 
E) a sender is using a parity scheme called Array Resource Quality

Question 5

______________ controls errors by detecting and correcting them at the receiving end without retransmission of the original message.

Accepted Answer

A) Hamming code 
B) Huffman encoding 
C) Front end processing 
D) Wave division multiplexing 
E) Hub polling 
A) Hamming code 
B) Huffman encoding 
C) Front end processing 
D) Wave division multiplexing 
E) Hub polling

Question 6

Compare and contrast roll call polling, hub polling or token passing), and contention.Which is better, hub polling or contention? Explain.

Accepted Answer

Roll call polling, hub polling, and toke

Question 7

Media access control:

Accepted Answer

A) is not very important in point-to-point with full duplex configuration 
B) is not very important in local area networks 
C) is not very important in a point-to-point with a half duplex configuration 
D) is not very important in a multipoint configuration 
E) does not control when computers transmit 
A) is not very important in point-to-point with full duplex configuration 
B) is not very important in local area networks 
C) is not very important in a point-to-point with a half duplex configuration 
D) is not very important in a multipoint configuration 
E) does not control when computers transmit

Question 8

When we amplify the signal on an analog circuit, we also amplify any noise that is present on the circuit.

Accepted Answer

A) True 
 B)False

Question 9

The two categories of network errors are: lost data and delimited data.

Accepted Answer

A) True 
 B)False

Question 10

What is transparency?

Accepted Answer

Transparency, in a general context, refe

Question 11

Another term for impulse noise is:

Accepted Answer

A) Gaussian noise 
B) spikes 
C) attenuation 
D) cross-talk 
E) intermodulation noise 
A) Gaussian noise 
B) spikes 
C) attenuation 
D) cross-talk 
E) intermodulation noise

Question 12

Calculating the actual throughput of a data communication network is:

Accepted Answer

A) not normally required for synchronous networks because they are so fast 
B) complex because many factors affect throughput 
C) simple because packet size is the primary factor affecting throughput 
D) not needed for satellite-based networks 
E) far less complicated if the system operates on a contention basis 
A) not normally required for synchronous networks because they are so fast 
B) complex because many factors affect throughput 
C) simple because packet size is the primary factor affecting throughput 
D) not needed for satellite-based networks 
E) far less complicated if the system operates on a contention basis

Question 13

In general, controlled approaches:

Accepted Answer

A) work better than contention approaches for small networks that have low usage 
B) work better than contention approaches for large networks that have high usage 
C) work better than contention approaches for all sizes of networks 
D) do not require a host, server, or active monitor to assign media access control 
E) have many collisions 
A) work better than contention approaches for small networks that have low usage 
B) work better than contention approaches for large networks that have high usage 
C) work better than contention approaches for all sizes of networks 
D) do not require a host, server, or active monitor to assign media access control 
E) have many collisions

Question 14

Only the sender of a data transmission needs to be concerned about the rules or protocols that govern how it communicates with the receiver.

Accepted Answer

A) True 
 B)False

Question 15

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 16

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 17

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

Accepted Answer

Asynchronous transmission and synchronou

Question 18

Using parity, the probability for detecting an error, given that one has occurred, is:

Accepted Answer

A) about 50% for either even or odd parity 
B) about 70% for even parity and 30% for odd parity 
C) about 30% for even parity and 70% for odd parity 
D) about 0% for either even or odd parity 
E) about 100% for either even or odd parity 
A) about 50% for either even or odd parity 
B) about 70% for even parity and 30% for odd parity 
C) about 30% for even parity and 70% for odd parity 
D) about 0% for either even or odd parity 
E) about 100% for either even or odd parity

Question 19

How do amplifiers differ from repeaters?

Accepted Answer

Amplifiers and repeaters are both device

Question 20

If a signal with a frequency of 500 MHz combines with a another signal of 1500 MHz and they form a new signal of 2000 MHz; this is an example of:

Accepted Answer

A) intermodulation noise 
B) attenuation 
C) echo 
D) white noise 
E) cross-talk 
A) intermodulation noise 
B) attenuation 
C) echo 
D) white noise 
E) cross-talk

With roll-call polling, a server polls clients in a consecutive, pre-arranged priority list.

Describe three approaches to detecting errors, including how they work, the probability of detecting an error, and any other benefits or limitations.

Optical media is:

ARQ means that:

______________ controls errors by detecting and correcting them at the receiving end without retransmission of the original message.

Compare and contrast roll call polling, hub polling or token passing), and contention.Which is better, hub polling or contention? Explain.

Media access control:

When we amplify the signal on an analog circuit, we also amplify any noise that is present on the circuit.

The two categories of network errors are: lost data and delimited data.

What is transparency?

Another term for impulse noise is:

Calculating the actual throughput of a data communication network is:

In general, controlled approaches:

Only the sender of a data transmission needs to be concerned about the rules or protocols that govern how it communicates with the receiver.

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?

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

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

Using parity, the probability for detecting an error, given that one has occurred, is:

How do amplifiers differ from repeaters?

If a signal with a frequency of 500 MHz combines with a another signal of 1500 MHz and they form a new signal of 2000 MHz; this is an example of:

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

With roll-call polling, a server polls clients in a consecutive, pre-arranged priority list.

Describe three approaches to detecting errors, including how they work, the probability of detecting an error, and any other benefits or limitations.

Optical media is:

ARQ means that:

______________ controls errors by detecting and correcting them at the receiving end without retransmission of the original message.

Compare and contrast roll call polling, hub polling or token passing), and contention.Which is better, hub polling or contention? Explain.

Media access control:

When we amplify the signal on an analog circuit, we also amplify any noise that is present on the circuit.

The two categories of network errors are: lost data and delimited data.

What is transparency?

Another term for impulse noise is:

Calculating the actual throughput of a data communication network is:

In general, controlled approaches:

Only the sender of a data transmission needs to be concerned about the rules or protocols that govern how it communicates with the receiver.

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?

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

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

Using parity, the probability for detecting an error, given that one has occurred, is:

How do amplifiers differ from repeaters?

If a signal with a frequency of 500 MHz combines with a another signal of 1500 MHz and they form a new signal of 2000 MHz; this is an example of:

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