Question 1

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 2

Which of the following media is least susceptible to noise?

Accepted Answer

A)  fiber optic cable 
B)  coaxial cable 
C)  twisted pair 
D)  unshielded twisted pair 
E)  shielded twisted pair 
A)  fiber optic cable 
B)  coaxial cable 
C)  twisted pair 
D)  unshielded twisted pair 
E)  shielded twisted pair

Question 3

One type of forward error correction is the Hamming code.

Accepted Answer

A) True 
 B)False

Question 4

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

Accepted Answer

Stop-and-wait ARQ and continuous ARQ are

Question 5

_____________ is an effective way to prevent impulse noise,cross talk,and intermodulation noise.

Accepted Answer

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

Question 6

____________ 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 7

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

Accepted Answer

A) True 
 B)False

Question 8

TRIB,an acronym that relates to throughput,stands for:

Accepted Answer

A)  Throughput Reduction of Information Barriers 
B)  Transmission Rate of Information Bits 
C)  Throughput Rate of Iso-synchronous Bytes 
D)  Transmission Regulation for Inverse-multiplexing Bands 
E)  Trellis-coded Regulation of Information Bits 
A)  Throughput Reduction of Information Barriers 
B)  Transmission Rate of Information Bits 
C)  Throughput Rate of Iso-synchronous Bytes 
D)  Transmission Regulation for Inverse-multiplexing Bands 
E)  Trellis-coded Regulation of Information Bits

Question 9

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

Question 10

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

Question 11

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 12

How do amplifiers differ from repeaters?

Accepted Answer

Amplifiers and repeaters are both device

Question 13

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

Accepted Answer

The packet layout for SDLC (Synchronous

Question 14

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 15

With __________ ARQ,the sender immediately sends the next message or packet of data.

Accepted Answer

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

Question 16

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 17

The data link layer accepts messages from the network layer and controls the hardware that transmits them.

Accepted Answer

A) True 
 B)False

Question 18

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 is a byte-count-oriented protocol 
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 
E)  It does not have a problem with transparency 
A)  It is a client-server protocol developed by Compaq in 1996 
B)  It is a byte-count-oriented protocol 
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 
E)  It does not have a problem with transparency

Question 19

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 20

Impulse noise is caused by the thermal agitation of electrons.

Accepted Answer

A) True 
 B)False

With contention:

Which of the following media is least susceptible to noise?

One type of forward error correction is the Hamming code.

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

_____________ is an effective way to prevent impulse noise,cross talk,and intermodulation noise.

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

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

TRIB,an acronym that relates to throughput,stands for:

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

In ARQ,a NAK:

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?

How do amplifiers differ from repeaters?

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

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.

With __________ ARQ,the sender immediately sends the next message or packet of data.

ARQ means that:

The data link layer accepts messages from the network layer and controls the hardware that transmits them.

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

Media access control:

Impulse noise is caused by the thermal agitation of electrons.

Introduction to Data Communications

Application Layer

Physical Layer

Network and Transport Layers

Wired and Wireless LANs

Backbone Networks

Wide Area Networks

The Internet

Network Security

Network Design

Network Management

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Exam 4: Data Link Layer

With contention:

Which of the following media is least susceptible to noise?

One type of forward error correction is the Hamming code.

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

_____________ is an effective way to prevent impulse noise,cross talk,and intermodulation noise.

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

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

TRIB,an acronym that relates to throughput,stands for:

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

In ARQ,a NAK:

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?

How do amplifiers differ from repeaters?

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

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.

With __________ ARQ,the sender immediately sends the next message or packet of data.

ARQ means that:

The data link layer accepts messages from the network layer and controls the hardware that transmits them.

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

Media access control:

Impulse noise is caused by the thermal agitation of electrons.

Introduction to Data Communications

Application Layer

Physical Layer

Network and Transport Layers

Wired and Wireless LANs

Backbone Networks

Wide Area Networks

The Internet

Network Security

Network Design

Network Management

Filters