Question 1

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

Accepted Answer

A) True 
 B)False

Question 2

Describe the process of MAC address spoofing

Accepted Answer

MAC address spoofing is the process of c

Question 3

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 4

What is media access control and why is it important? What are two examples of controlled access methods and contention based media access methods? When might one access method be preferred over another in a network, and why? Under what conditions do contention-based media access control techniques outperform controlled-access techniques i.e., have lower response time)? Explain.

Accepted Answer

Media access control (MAC) is a sublayer

Question 5

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 6

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

Accepted Answer

A) True 
 B)False

Question 7

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 8

Gaussian noise is a special type of attenuation.

Accepted Answer

A) True 
 B)False

Question 9

The simplest method for error correction is retransmission.

Accepted Answer

A) True 
 B)False

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

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 12

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 13

Parity checking can only detect an error when an even number of bits are switched.

Accepted Answer

A) True 
 B)False

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

Data transmission errors are typically uniformly distributed in time.

Accepted Answer

A) True 
 B)False

Question 16

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 17

Forward error correction is commonly used in satellite transmission.

Accepted Answer

A) True 
 B)False

Question 18

With __________ ARQ, the sender pauses for a response from the receiver to alter each message or packet of data.

Accepted Answer

A) open window 
B) halt and be recognized HBR) 
C) sliding window 
D) stop and wait 
E) continuous 
A) open window 
B) halt and be recognized HBR) 
C) sliding window 
D) stop and wait 
E) continuous

Question 19

When a signal is reflected back to the transmitting equipment, it is called an) _________.

Accepted Answer

A) white noise 
B) echo 
C) crosstalk 
D) attenuation 
E) impulse noise 
A) white noise 
B) echo 
C) crosstalk 
D) attenuation 
E) impulse noise

Question 20

Which of the following is not a type of synchronous protocol?

Accepted Answer

A) SDLC 
B) VT100 
C) HDLC 
D) Ethernet 
E) PPP 
A) SDLC 
B) VT100 
C) HDLC 
D) Ethernet 
E) PPP

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

Describe the process of MAC address spoofing

Another term for impulse noise is:

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

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

Calculating the actual throughput of a data communication network is:

Gaussian noise is a special type of attenuation.

The simplest method for error correction is retransmission.

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

ARQ means that:

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

Parity checking can only detect an error when an even number of bits are switched.

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

Data transmission errors are typically uniformly distributed in time.

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?

Forward error correction is commonly used in satellite transmission.

With __________ ARQ, the sender pauses for a response from the receiver to alter each message or packet of data.

When a signal is reflected back to the transmitting equipment, it is called an) _________.

Which of the following is not a type of synchronous protocol?

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

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

Describe the process of MAC address spoofing

Another term for impulse noise is:

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

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

Calculating the actual throughput of a data communication network is:

Gaussian noise is a special type of attenuation.

The simplest method for error correction is retransmission.

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

ARQ means that:

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

Parity checking can only detect an error when an even number of bits are switched.

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

Data transmission errors are typically uniformly distributed in time.

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?

Forward error correction is commonly used in satellite transmission.

With __________ ARQ, the sender pauses for a response from the receiver to alter each message or packet of data.

When a signal is reflected back to the transmitting equipment, it is called an) _________.

Which of the following is not a type of synchronous protocol?

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