Question 1

In communication protocols, _________ are used to convey the user's meaning.

Accepted Answer

A) information bits 
B) overhead bits 
C) stop bits 
D) start bits 
E) flag bits 
A) information bits 
B) overhead bits 
C) stop bits 
D) start bits 
E) flag bits

Question 2

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

Question 3

The distance between repeaters or amplifiers on a telephone circuit is determined by the amount of power gained per unit length of the transmission.

Accepted Answer

A) True 
 B)False

Question 4

Synchronous transmission:

Accepted Answer

A) cannot be used on multipoint circuits 
B) is used to send one character at a time 
C) uses start bits before each character to be sent 
D) uses stop bits after each character to be sent 
E) is used to transmit a "frame" or "packet" of data at a time 
A) cannot be used on multipoint circuits 
B) is used to send one character at a time 
C) uses start bits before each character to be sent 
D) uses stop bits after each character to be sent 
E) is used to transmit a "frame" or "packet" of data at a time

Question 5

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

Question 6

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

Accepted Answer

Reducing errors and mitigating the effec

Question 7

Impulse noise is caused by the thermal agitation of electrons.

Accepted Answer

A) True 
 B)False

Question 8

Cross-talk:

Accepted Answer

A) occurs when one circuit picks up signals in another 
B) is always bothersome because it has a high signal strength 
C) decreases with increased proximity of two wires 
D) decreases during wet or damp weather 
E) increases with lower frequency signals 
A) occurs when one circuit picks up signals in another 
B) is always bothersome because it has a high signal strength 
C) decreases with increased proximity of two wires 
D) decreases during wet or damp weather 
E) increases with lower frequency signals

Question 9

What does the data link layer do? What are its primary responsibilities? Where does the data link layer sit in terms of the simplified five layer network model?

Accepted Answer

The data link layer is responsible for t

Question 10

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

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

Which of the following is true about the data link protocol, SDLC:

Accepted Answer

A) It is a client-server protocol developed by Compaq in 1996. 
B) It transmits each character independently of one another and includes start and stop bits for each character sent. 
C) It uses a special bit pattern called a flag at the beginning and end of every frame or packet). 
D) It uses a contention media access control protocol and is used in most LANs today. 
E) It does not have any error detection capabilities. 
A) It is a client-server protocol developed by Compaq in 1996. 
B) It transmits each character independently of one another and includes start and stop bits for each character sent. 
C) It uses a special bit pattern called a flag at the beginning and end of every frame or packet). 
D) It uses a contention media access control protocol and is used in most LANs today. 
E) It does not have any error detection capabilities.

Question 13

How does forward error correction work? How is it different from other error correction methods? Under what circumstances is forward error correction desirable? What is one type of forward error correction by name? Given a diagram like that in the text of forward error correction, be able to explain how the system works.

Accepted Answer

Forward error correction (FEC) is a meth

Question 14

HDLC is very similar to the SDLC synchronous data link protocol.

Accepted Answer

A) True 
 B)False

Question 15

The probability of detecting an error, given that one has occurred, using parity checking is about:

Accepted Answer

A) 100% 
B) 0% 
C) 50% 
D) 75% 
E) 98% 
A) 100% 
B) 0% 
C) 50% 
D) 75% 
E) 98%

Question 16

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 17

With contention:

Accepted Answer

A) computers wait until the circuit is free before they send data 
B) the server or front end processor works consecutively through a list of clients to determine who should have access to the media 
C) the front end processor must wait for a response from the polled client or terminal 
D) one computer starts the poll and passes it to the next computer on the multipoint circuit 
E) there is never a chance for "collision," or two computers trying to send data at the same time 
A) computers wait until the circuit is free before they send data 
B) the server or front end processor works consecutively through a list of clients to determine who should have access to the media 
C) the front end processor must wait for a response from the polled client or terminal 
D) one computer starts the poll and passes it to the next computer on the multipoint circuit 
E) there is never a chance for "collision," or two computers trying to send data at the same time

Question 18

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 19

How does cyclical redundancy checking work?

Accepted Answer

Cyclic Redundancy Check (CRC) is an erro

Question 20

Attenuation refers to the loss of signal strength.

Accepted Answer

A) True 
 B)False

In communication protocols, _________ are used to convey the user's meaning.

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

The distance between repeaters or amplifiers on a telephone circuit is determined by the amount of power gained per unit length of the transmission.

Synchronous transmission:

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:

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

Impulse noise is caused by the thermal agitation of electrons.

Cross-talk:

What does the data link layer do? What are its primary responsibilities? Where does the data link layer sit in terms of the simplified five layer network model?

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

Errors on a network can occur:

Which of the following is true about the data link protocol, SDLC:

HDLC is very similar to the SDLC synchronous data link protocol.

The probability of detecting an error, given that one has occurred, using parity checking is about:

In general, controlled approaches:

With contention:

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

How does cyclical redundancy checking work?

Attenuation refers to the loss of signal strength.

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

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Exam 4: Data Link Layer

In communication protocols, _________ are used to convey the user's meaning.

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

The distance between repeaters or amplifiers on a telephone circuit is determined by the amount of power gained per unit length of the transmission.

Synchronous transmission:

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:

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

Impulse noise is caused by the thermal agitation of electrons.

Cross-talk:

What does the data link layer do? What are its primary responsibilities? Where does the data link layer sit in terms of the simplified five layer network model?

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

Errors on a network can occur:

Which of the following is true about the data link protocol, SDLC:

HDLC is very similar to the SDLC synchronous data link protocol.

The probability of detecting an error, given that one has occurred, using parity checking is about:

In general, controlled approaches:

With contention:

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

How does cyclical redundancy checking work?

Attenuation refers to the loss of signal strength.

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