Computer Networks Exam Questions and
Answers PDF 2026/2027: 80 Multiple-Choice
Questions Covering Flow Control,
Multiplexing, Routing Protocols, Network
Devices, OSI Layers, and Troubleshooting
for University Students
Description:
This comprehensive Computer Networks examination paper features 80 expertly crafted
multiple-choice questions with detailed answers and explanations, covering essential
networking topics including flow control mechanisms, sliding window protocols,
multiplexing techniques (FDM, TDM, ATDM), access methods (CSMA/CD, CSMA/CA),
network devices (switches, routers, repeaters, hubs), routing algorithms, ARP, Spanning
Tree Protocol, VLANs, QoS, and network troubleshooting. Designed for 2026/2027
academic standards, this test bank serves as an invaluable study resource for university students
preparing for computer science and information technology examinations. Each question is
accompanied by clear answers and comprehensive explanations to reinforce understanding of
complex networking concepts.
Download now to excel in your Computer Networks exams and secure top grades with this
complete examination preparation guide.
, Computer Networks Exam 2026/2027: 80 Questions & Answers
SECTION A: NETWORK FUNDAMENTALS AND DATA TRANSMISSION
(Questions 1-10)
Question 1
Which of the following best describes the primary function of flow control in data
communication networks?
A) To regulate the rate at which a sender transmits data to prevent overwhelming the receiver
B) To establish a physical connection between two communicating devices
C) To encrypt data during transmission for security purposes
D) To determine the optimal path for data packets through the network
Answer: A
Explanation: Flow control manages the pace of data transmission between sender and receiver
to prevent the sender from overwhelming the receiver's processing and buffering capacity,
thereby avoiding data loss through various protocols that regulate data flow based on receiver
capacity and network conditions.
Question 2
Which statement accurately characterizes the stop-and-wait flow control mechanism?
A) It allows multiple packets to be in transit before receiving acknowledgments
B) It is highly efficient for high-bandwidth, long-distance connections
C) It sends one packet and waits for an acknowledgment before sending the next
D) It uses a sliding window to dynamically adjust transmission rates
Answer: C
Explanation: The stop-and-wait protocol transmits a single packet and pauses until it receives
an acknowledgment from the receiver, and while this ensures reliable data transfer, it is
,inherently inefficient in high-latency environments because the transmission medium remains
idle during the waiting period, significantly underutilizing available bandwidth.
Question 3
The sliding window protocol improves transmission efficiency by:
A) Eliminating the need for error detection mechanisms
B) Allowing a specified number of packets to be sent without waiting for individual
acknowledgments
C) Using frequency division multiplexing to increase bandwidth
D) Reducing the size of each data packet to minimize transmission time
Answer: B
Explanation: The sliding window protocol permits multiple packets to be transmitted before
requiring an acknowledgment, and the window size determines the maximum number of
outstanding packets allowed, which dramatically improves channel utilization and throughput as
the sender can continuously transmit while acknowledgments are being processed.
Question 4
Which of the following correctly describes the relationship between analog audio and its digital
representation in modern communication systems?
A) Digital audio is an exact replica of the original analog signal without any data loss
B) Digitized audio represents continuous analog signals through discrete sampling and
quantization
C) Analog audio provides better quality than digital audio in all applications
D) Digital conversion of analog audio eliminates the need for compression techniques
Answer: B
Explanation: Digitization of analog audio involves sampling the continuous analog waveform at
discrete time intervals and quantizing the amplitude values to finite digital representations, and
, this process governed by the Nyquist-Shannon sampling theorem converts continuous-time
signals into discrete digital signals enabling efficient storage and transmission.
Question 5
Digital trunks in modern telecommunications infrastructure refer to:
A) Physical copper cables used for analog voice transmission
B) Wireless communication channels between mobile devices
C) High-capacity digital circuits capable of carrying multiple simultaneous transmissions
D) Backup communication paths used during network failures
Answer: C
Explanation: Digital trunks are high-bandwidth digital circuits that serve as the backbone of
telecommunications networks carrying aggregated traffic from multiple sources, and these
circuits implemented using technologies such as T-carrier or SONET provide the capacity to
transport numerous voice calls and data streams simultaneously.
Question 6
SONET (Synchronous Optical Network) is characterized by which of the following features?
A) It is a wireless transmission standard for local area networks
B) It provides encoding and transmission standards specifically designed for fiber optic networks
C) It operates exclusively in the radio frequency spectrum
D) It is a proprietary standard developed by a single vendor
Answer: B
Explanation: SONET is an American National Standards Institute standard that defines physical
layer and data link layer protocols for optical fiber transmission, and it provides a synchronous
multiplexing format that enables multiple data streams of different rates to be transported over
the same optical fiber with robust error detection and automatic protection switching.
Answers PDF 2026/2027: 80 Multiple-Choice
Questions Covering Flow Control,
Multiplexing, Routing Protocols, Network
Devices, OSI Layers, and Troubleshooting
for University Students
Description:
This comprehensive Computer Networks examination paper features 80 expertly crafted
multiple-choice questions with detailed answers and explanations, covering essential
networking topics including flow control mechanisms, sliding window protocols,
multiplexing techniques (FDM, TDM, ATDM), access methods (CSMA/CD, CSMA/CA),
network devices (switches, routers, repeaters, hubs), routing algorithms, ARP, Spanning
Tree Protocol, VLANs, QoS, and network troubleshooting. Designed for 2026/2027
academic standards, this test bank serves as an invaluable study resource for university students
preparing for computer science and information technology examinations. Each question is
accompanied by clear answers and comprehensive explanations to reinforce understanding of
complex networking concepts.
Download now to excel in your Computer Networks exams and secure top grades with this
complete examination preparation guide.
, Computer Networks Exam 2026/2027: 80 Questions & Answers
SECTION A: NETWORK FUNDAMENTALS AND DATA TRANSMISSION
(Questions 1-10)
Question 1
Which of the following best describes the primary function of flow control in data
communication networks?
A) To regulate the rate at which a sender transmits data to prevent overwhelming the receiver
B) To establish a physical connection between two communicating devices
C) To encrypt data during transmission for security purposes
D) To determine the optimal path for data packets through the network
Answer: A
Explanation: Flow control manages the pace of data transmission between sender and receiver
to prevent the sender from overwhelming the receiver's processing and buffering capacity,
thereby avoiding data loss through various protocols that regulate data flow based on receiver
capacity and network conditions.
Question 2
Which statement accurately characterizes the stop-and-wait flow control mechanism?
A) It allows multiple packets to be in transit before receiving acknowledgments
B) It is highly efficient for high-bandwidth, long-distance connections
C) It sends one packet and waits for an acknowledgment before sending the next
D) It uses a sliding window to dynamically adjust transmission rates
Answer: C
Explanation: The stop-and-wait protocol transmits a single packet and pauses until it receives
an acknowledgment from the receiver, and while this ensures reliable data transfer, it is
,inherently inefficient in high-latency environments because the transmission medium remains
idle during the waiting period, significantly underutilizing available bandwidth.
Question 3
The sliding window protocol improves transmission efficiency by:
A) Eliminating the need for error detection mechanisms
B) Allowing a specified number of packets to be sent without waiting for individual
acknowledgments
C) Using frequency division multiplexing to increase bandwidth
D) Reducing the size of each data packet to minimize transmission time
Answer: B
Explanation: The sliding window protocol permits multiple packets to be transmitted before
requiring an acknowledgment, and the window size determines the maximum number of
outstanding packets allowed, which dramatically improves channel utilization and throughput as
the sender can continuously transmit while acknowledgments are being processed.
Question 4
Which of the following correctly describes the relationship between analog audio and its digital
representation in modern communication systems?
A) Digital audio is an exact replica of the original analog signal without any data loss
B) Digitized audio represents continuous analog signals through discrete sampling and
quantization
C) Analog audio provides better quality than digital audio in all applications
D) Digital conversion of analog audio eliminates the need for compression techniques
Answer: B
Explanation: Digitization of analog audio involves sampling the continuous analog waveform at
discrete time intervals and quantizing the amplitude values to finite digital representations, and
, this process governed by the Nyquist-Shannon sampling theorem converts continuous-time
signals into discrete digital signals enabling efficient storage and transmission.
Question 5
Digital trunks in modern telecommunications infrastructure refer to:
A) Physical copper cables used for analog voice transmission
B) Wireless communication channels between mobile devices
C) High-capacity digital circuits capable of carrying multiple simultaneous transmissions
D) Backup communication paths used during network failures
Answer: C
Explanation: Digital trunks are high-bandwidth digital circuits that serve as the backbone of
telecommunications networks carrying aggregated traffic from multiple sources, and these
circuits implemented using technologies such as T-carrier or SONET provide the capacity to
transport numerous voice calls and data streams simultaneously.
Question 6
SONET (Synchronous Optical Network) is characterized by which of the following features?
A) It is a wireless transmission standard for local area networks
B) It provides encoding and transmission standards specifically designed for fiber optic networks
C) It operates exclusively in the radio frequency spectrum
D) It is a proprietary standard developed by a single vendor
Answer: B
Explanation: SONET is an American National Standards Institute standard that defines physical
layer and data link layer protocols for optical fiber transmission, and it provides a synchronous
multiplexing format that enables multiple data streams of different rates to be transported over
the same optical fiber with robust error detection and automatic protection switching.
