TEST BANK FOR BUSINESS DATA
COMMUNICATIONS CHAPTER 4-6
EXAM 2025/2026 QUESTIONS AND
ANSWERS 100% PASS
Media access controls - ANS Refer to the need to control when computers transmit.
Data link layer - ANS Accepts messages from the network layer and controls the hardware
that transmits them.
Rules or protocols in data transmission - ANS Both the sender and receiver need to be
concerned about the rules or protocols that govern how they communicate.
Contention - ANS A form of media access control where a computer does not have to wait
before it can transmit; it can transmit at any time.
Polling - ANS The process of permitting clients to transmit or receive at specific times, not at
any time.
Roll-call polling - ANS A server polls clients in a consecutive, pre-arranged priority list.
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
,Token passing - ANS A term that refers to hub polling, where one computer starts a poll and
passes it to the next computer on a multipoint circuit.
Ethernet local area networks - ANS Widely use contention for media access control.
Controlled access MAC approaches - ANS Work well in a large network with high usage.
Commonly used controlled access techniques - ANS Include access requests, access
demands, and polling.
Categories of network errors - ANS Include lost data and delimited data.
Message corruption - ANS Occurs if a computer transmits a message containing 'ABC' and the
destination computer receives 'abc'.
Data transmission errors - ANS Typically are not distributed uniformly in time.
Undesirable stray electrical voltage - ANS Can cause data communication errors.
Gaussian noise - ANS Is a special type of attenuation.
Impulse noise - ANS Is caused by the thermal agitation of electrons.
Crosstalk - ANS Occurs when the signal transmitted on one circuit or channel creates an
undesired effect in another circuit or channel.
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
,Attenuation - ANS Refers to the loss of signal strength.
Intermodulation noise - ANS Occurs when the signals from two circuits combine to form a
new signal that falls into a frequency band reserved for another signal.
Physical and data link layers of wired Ethernet - ANS Have been refined over the years as a
collection of standards under the IEEE 802.3 workgroup.
Distance between repeaters or amplifiers on a telephone circuit - ANS Is determined by the
amount of power gained per unit length of the transmission.
Amplifying the signal on an analog circuit - ANS Also amplifies any noise that is present on
the circuit.
Error detection and correction - ANS Requires extra error detection 'data' to be included with
each message.
Odd parity-checking scheme - ANS Sets the parity bit to make the total number of ones in the
byte an even number.
Parity checking - ANS Can only detect an error when an even number of bits are switched.
Cyclical redundancy check - ANS Is one of the most popular polynomial error-checking
schemes.
Simplest method for error correction - ANS Is retransmission.
3 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
, Continuous ARQ - ANS Is another term for sliding window.
Forward error correction - ANS One type is the Hamming code.
Forward error correction - ANS Commonly used in satellite transmission.
HDLC - ANS Very similar to the SDLC synchronous data link protocol.
Overhead bits - ANS Used for error checking and marking the start and end of characters and
packets.
Transmission efficiency - ANS Refers to the percentage of bits transmitted without errors.
Data link layer - ANS Accepts streams of bits from the application layer.
Data link layer - ANS Responsible for encoding the bit-stream as a series of electronic
voltages.
Data link layer - ANS Performs error detection.
Data link layer - ANS Performs routing functions.
Data link layer - ANS Organizes data from the physical layer and passes these coherent
messages directly to the application layer.
4 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
COMMUNICATIONS CHAPTER 4-6
EXAM 2025/2026 QUESTIONS AND
ANSWERS 100% PASS
Media access controls - ANS Refer to the need to control when computers transmit.
Data link layer - ANS Accepts messages from the network layer and controls the hardware
that transmits them.
Rules or protocols in data transmission - ANS Both the sender and receiver need to be
concerned about the rules or protocols that govern how they communicate.
Contention - ANS A form of media access control where a computer does not have to wait
before it can transmit; it can transmit at any time.
Polling - ANS The process of permitting clients to transmit or receive at specific times, not at
any time.
Roll-call polling - ANS A server polls clients in a consecutive, pre-arranged priority list.
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
,Token passing - ANS A term that refers to hub polling, where one computer starts a poll and
passes it to the next computer on a multipoint circuit.
Ethernet local area networks - ANS Widely use contention for media access control.
Controlled access MAC approaches - ANS Work well in a large network with high usage.
Commonly used controlled access techniques - ANS Include access requests, access
demands, and polling.
Categories of network errors - ANS Include lost data and delimited data.
Message corruption - ANS Occurs if a computer transmits a message containing 'ABC' and the
destination computer receives 'abc'.
Data transmission errors - ANS Typically are not distributed uniformly in time.
Undesirable stray electrical voltage - ANS Can cause data communication errors.
Gaussian noise - ANS Is a special type of attenuation.
Impulse noise - ANS Is caused by the thermal agitation of electrons.
Crosstalk - ANS Occurs when the signal transmitted on one circuit or channel creates an
undesired effect in another circuit or channel.
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
,Attenuation - ANS Refers to the loss of signal strength.
Intermodulation noise - ANS Occurs when the signals from two circuits combine to form a
new signal that falls into a frequency band reserved for another signal.
Physical and data link layers of wired Ethernet - ANS Have been refined over the years as a
collection of standards under the IEEE 802.3 workgroup.
Distance between repeaters or amplifiers on a telephone circuit - ANS Is determined by the
amount of power gained per unit length of the transmission.
Amplifying the signal on an analog circuit - ANS Also amplifies any noise that is present on
the circuit.
Error detection and correction - ANS Requires extra error detection 'data' to be included with
each message.
Odd parity-checking scheme - ANS Sets the parity bit to make the total number of ones in the
byte an even number.
Parity checking - ANS Can only detect an error when an even number of bits are switched.
Cyclical redundancy check - ANS Is one of the most popular polynomial error-checking
schemes.
Simplest method for error correction - ANS Is retransmission.
3 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
, Continuous ARQ - ANS Is another term for sliding window.
Forward error correction - ANS One type is the Hamming code.
Forward error correction - ANS Commonly used in satellite transmission.
HDLC - ANS Very similar to the SDLC synchronous data link protocol.
Overhead bits - ANS Used for error checking and marking the start and end of characters and
packets.
Transmission efficiency - ANS Refers to the percentage of bits transmitted without errors.
Data link layer - ANS Accepts streams of bits from the application layer.
Data link layer - ANS Responsible for encoding the bit-stream as a series of electronic
voltages.
Data link layer - ANS Performs error detection.
Data link layer - ANS Performs routing functions.
Data link layer - ANS Organizes data from the physical layer and passes these coherent
messages directly to the application layer.
4 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
