Data Communications Exam Practice
Questions And Correct Answers
(Verified Answers) Plus Rationale 2027
Q&A| Instant Download Pdf.
1. Which statement most accurately defines data communication in the
context of computer networks?
A. The process of storing data permanently on a computer's secondary
storage device
B. The process of exchanging digital or analog information between two or
more devices through a transmission medium
C. The process of converting source code into machine code
D. The process of controlling access to files stored on a local computer
Answer: B
Data communication is the exchange of information between
communicating devices through a suitable transmission medium using
agreed communication procedures or protocols.
2. Which of the following is NOT one of the fundamental components of
a basic data communication system?
A. Sender
B. Receiver
C. Transmission medium
D. Compiler
,Answer: D
A basic data communication system consists of a sender, receiver,
message, transmission medium, and protocol; a compiler is a software-
development tool and is not a fundamental communication component.
3. In a data communication system, what is the primary function of the
sender?
A. To interpret the received message
B. To initiate and transmit the message toward the destination
C. To provide permanent storage for the message
D. To determine the physical length of the transmission medium
Answer: B
The sender is the device or system that originates the data and prepares it
for transmission toward the intended receiver.
4. Which characteristic of data communication refers to the ability of a
system to deliver data to the intended destination accurately?
A. Delivery
B. Timeliness
C. Jitter
D. Multiplexing
Answer: A
Delivery means that transmitted data must reach the correct destination
or intended device in the communication system.
5. Which characteristic requires data to arrive at the destination within
an appropriate period?
A. Accuracy
B. Timeliness
,C. Security
D. Modulation
Answer: B
Timeliness requires data to arrive when it is needed, because excessively
delayed information may be useless even if it is eventually delivered
correctly.
6. Which communication mode permits data transmission in both
directions, but only one direction at a time?
A. Simplex
B. Half-duplex
C. Full-duplex
D. Multiplex
Answer: B
Half-duplex communication permits both devices to transmit and receive,
but the two directions cannot normally operate simultaneously.
7. Which communication mode allows simultaneous transmission of data
in both directions?
A. Simplex
B. Half-duplex
C. Full-duplex
D. Asynchronous simplex
Answer: C
Full-duplex communication allows both communicating devices to transmit
and receive simultaneously, making it suitable for interactive applications
such as telephone conversations.
, 8. A television broadcast in which information travels primarily from the
broadcasting station to viewers is an example of which transmission
mode?
A. Simplex
B. Half-duplex
C. Full-duplex
D. Multiplex
Answer: A
Simplex communication provides communication in only one direction, so a
conventional broadcast from a transmitter to receivers is an appropriate
example.
9. Which topology connects every device to a central connecting device
such as a switch?
A. Bus
B. Ring
C. Star
D. Mesh
Answer: C
In a star topology, each node has a separate connection to a central
device, which commonly manages communication between the connected
nodes.
10. What is a major disadvantage of a bus topology?
A. It requires a dedicated physical link between every pair of devices
B. Failure of the central switch disconnects the entire network
C. A break in the main backbone can disrupt communication for many or all
devices
D. It cannot support digital communication
Questions And Correct Answers
(Verified Answers) Plus Rationale 2027
Q&A| Instant Download Pdf.
1. Which statement most accurately defines data communication in the
context of computer networks?
A. The process of storing data permanently on a computer's secondary
storage device
B. The process of exchanging digital or analog information between two or
more devices through a transmission medium
C. The process of converting source code into machine code
D. The process of controlling access to files stored on a local computer
Answer: B
Data communication is the exchange of information between
communicating devices through a suitable transmission medium using
agreed communication procedures or protocols.
2. Which of the following is NOT one of the fundamental components of
a basic data communication system?
A. Sender
B. Receiver
C. Transmission medium
D. Compiler
,Answer: D
A basic data communication system consists of a sender, receiver,
message, transmission medium, and protocol; a compiler is a software-
development tool and is not a fundamental communication component.
3. In a data communication system, what is the primary function of the
sender?
A. To interpret the received message
B. To initiate and transmit the message toward the destination
C. To provide permanent storage for the message
D. To determine the physical length of the transmission medium
Answer: B
The sender is the device or system that originates the data and prepares it
for transmission toward the intended receiver.
4. Which characteristic of data communication refers to the ability of a
system to deliver data to the intended destination accurately?
A. Delivery
B. Timeliness
C. Jitter
D. Multiplexing
Answer: A
Delivery means that transmitted data must reach the correct destination
or intended device in the communication system.
5. Which characteristic requires data to arrive at the destination within
an appropriate period?
A. Accuracy
B. Timeliness
,C. Security
D. Modulation
Answer: B
Timeliness requires data to arrive when it is needed, because excessively
delayed information may be useless even if it is eventually delivered
correctly.
6. Which communication mode permits data transmission in both
directions, but only one direction at a time?
A. Simplex
B. Half-duplex
C. Full-duplex
D. Multiplex
Answer: B
Half-duplex communication permits both devices to transmit and receive,
but the two directions cannot normally operate simultaneously.
7. Which communication mode allows simultaneous transmission of data
in both directions?
A. Simplex
B. Half-duplex
C. Full-duplex
D. Asynchronous simplex
Answer: C
Full-duplex communication allows both communicating devices to transmit
and receive simultaneously, making it suitable for interactive applications
such as telephone conversations.
, 8. A television broadcast in which information travels primarily from the
broadcasting station to viewers is an example of which transmission
mode?
A. Simplex
B. Half-duplex
C. Full-duplex
D. Multiplex
Answer: A
Simplex communication provides communication in only one direction, so a
conventional broadcast from a transmitter to receivers is an appropriate
example.
9. Which topology connects every device to a central connecting device
such as a switch?
A. Bus
B. Ring
C. Star
D. Mesh
Answer: C
In a star topology, each node has a separate connection to a central
device, which commonly manages communication between the connected
nodes.
10. What is a major disadvantage of a bus topology?
A. It requires a dedicated physical link between every pair of devices
B. Failure of the central switch disconnects the entire network
C. A break in the main backbone can disrupt communication for many or all
devices
D. It cannot support digital communication
