Computer Networking Exam Questions
2026/2027: 90 Multiple-Choice Questions
with Answers for TCP/IP, BGP, OSI Model,
Routing Protocols & Network Architecture -
University Study Guide
Description:
Master your 2026/2027 Computer Networking exam with 90 comprehensive MCQs covering
OSI layers, TCP/IP, BGP routing, congestion control, and network protocols. Complete
with detailed answers and explanations.
Download now and ace your networking certification!
, Computer Networking Exam 2026/2027: 90 Questions & Answers
SECTION A: NETWORK ARCHITECTURE AND MODELS
Question 1
Which of the following correctly describes a primary advantage of layered network
architectures?
A) They eliminate the need for protocol standardization
B) They increase the complexity of implementing network protocols
C) They provide scalability, flexibility, and ease of component modification
D) They reduce the total number of headers required in network transmissions
Answer: C
Explanation: Layered architectures provide several key advantages including scalability,
flexibility, and ease of adding or removing components. This modularity enables cost-effective
implementations and allows independent development of different layers. Options A and B are
incorrect as layered architectures actually rely heavily on standardization and can introduce
complexity. Option D is incorrect because layering typically adds headers rather than reducing
them.
Question 2
What is the primary difference between the OSI seven-layer model and the five-layer Internet
model?
A) The OSI model has no application layer
B) The five-layer model combines the application, presentation, and session layers into a single
application layer
C) The OSI model does not include a transport layer
D) The five-layer model separates the network layer into two distinct sublayers
Answer: B
,Explanation: The five-layer Internet model consolidates the application, presentation, and
session layers from the OSI model into a single application layer. This simplification reflects the
practical implementation of the TCP/IP protocol suite, where the functions of presentation and
session management are typically handled by individual applications rather than by the network
stack itself.
Question 3
In the context of computer networks, what is a socket?
A) A physical hardware connector used to attach network cables
B) A software endpoint for sending and receiving data across a network
C) A routing protocol that determines optimal network paths
D) A security mechanism that encrypts network communications
Answer: B
Explanation: A network socket is a software structure within a network node that serves as an
endpoint for sending and receiving data across the network. As described in Kurose and Ross, a
socket is the interface between the application layer and the transport layer within a host,
analogous to a door between a house and the outside world. Sockets exist only during the
lifetime of an application process.
Question 4
Which of the following best describes the End-to-End (E2E) principle in network design?
A) Network core devices should handle all complex processing functions
B) End systems should contain the intelligence while the network core remains simple
C) All network functions must be distributed equally across all layers
D) Security functions should be implemented exclusively in the network core
Answer: B
Explanation: The End-to-End principle states that the network core should be simple and
minimal, while end systems should carry the intelligence. Lower-level layers should perform
, only their designed functions, while higher-level layers handle more intricate application-specific
functions. This design choice has significantly shaped the current Internet architecture.
Question 5
Which of the following is considered a violation of the End-to-End principle?
A) Using TCP for reliable data transmission
B) Implementing firewalls that drop packets between end hosts
C) Using HTTP for web communications
D) Implementing DNS for name resolution
Answer: B
Explanation: Firewalls violate the End-to-End principle because they operate as intermediate
devices that can drop communications between end hosts. Similarly, Network Address
Translation (NAT) boxes violate the principle because they modify packet headers and create
addresses that are not globally routable, interfering with the direct communication between
endpoints.
Question 6
The EvoArch model of the Internet is described as having which shape?
A) A flat structure with equal layers
B) A pyramid shape with a broad base and narrow top
C) An hourglass shape with narrow middle layers
D) A circular structure with no defined layers
Answer: C
Explanation: The EvoArch model represents the Internet as an hourglass shape where the outer
bands (application and physical layers) are more frequently modified, and the inner layers (IP at
the center) are more stable and difficult to alter. This model captures the evolutionary dynamics
of the Internet architecture, where the narrow waist at the IP layer has proven remarkably stable
while technologies at the edges have evolved rapidly.
2026/2027: 90 Multiple-Choice Questions
with Answers for TCP/IP, BGP, OSI Model,
Routing Protocols & Network Architecture -
University Study Guide
Description:
Master your 2026/2027 Computer Networking exam with 90 comprehensive MCQs covering
OSI layers, TCP/IP, BGP routing, congestion control, and network protocols. Complete
with detailed answers and explanations.
Download now and ace your networking certification!
, Computer Networking Exam 2026/2027: 90 Questions & Answers
SECTION A: NETWORK ARCHITECTURE AND MODELS
Question 1
Which of the following correctly describes a primary advantage of layered network
architectures?
A) They eliminate the need for protocol standardization
B) They increase the complexity of implementing network protocols
C) They provide scalability, flexibility, and ease of component modification
D) They reduce the total number of headers required in network transmissions
Answer: C
Explanation: Layered architectures provide several key advantages including scalability,
flexibility, and ease of adding or removing components. This modularity enables cost-effective
implementations and allows independent development of different layers. Options A and B are
incorrect as layered architectures actually rely heavily on standardization and can introduce
complexity. Option D is incorrect because layering typically adds headers rather than reducing
them.
Question 2
What is the primary difference between the OSI seven-layer model and the five-layer Internet
model?
A) The OSI model has no application layer
B) The five-layer model combines the application, presentation, and session layers into a single
application layer
C) The OSI model does not include a transport layer
D) The five-layer model separates the network layer into two distinct sublayers
Answer: B
,Explanation: The five-layer Internet model consolidates the application, presentation, and
session layers from the OSI model into a single application layer. This simplification reflects the
practical implementation of the TCP/IP protocol suite, where the functions of presentation and
session management are typically handled by individual applications rather than by the network
stack itself.
Question 3
In the context of computer networks, what is a socket?
A) A physical hardware connector used to attach network cables
B) A software endpoint for sending and receiving data across a network
C) A routing protocol that determines optimal network paths
D) A security mechanism that encrypts network communications
Answer: B
Explanation: A network socket is a software structure within a network node that serves as an
endpoint for sending and receiving data across the network. As described in Kurose and Ross, a
socket is the interface between the application layer and the transport layer within a host,
analogous to a door between a house and the outside world. Sockets exist only during the
lifetime of an application process.
Question 4
Which of the following best describes the End-to-End (E2E) principle in network design?
A) Network core devices should handle all complex processing functions
B) End systems should contain the intelligence while the network core remains simple
C) All network functions must be distributed equally across all layers
D) Security functions should be implemented exclusively in the network core
Answer: B
Explanation: The End-to-End principle states that the network core should be simple and
minimal, while end systems should carry the intelligence. Lower-level layers should perform
, only their designed functions, while higher-level layers handle more intricate application-specific
functions. This design choice has significantly shaped the current Internet architecture.
Question 5
Which of the following is considered a violation of the End-to-End principle?
A) Using TCP for reliable data transmission
B) Implementing firewalls that drop packets between end hosts
C) Using HTTP for web communications
D) Implementing DNS for name resolution
Answer: B
Explanation: Firewalls violate the End-to-End principle because they operate as intermediate
devices that can drop communications between end hosts. Similarly, Network Address
Translation (NAT) boxes violate the principle because they modify packet headers and create
addresses that are not globally routable, interfering with the direct communication between
endpoints.
Question 6
The EvoArch model of the Internet is described as having which shape?
A) A flat structure with equal layers
B) A pyramid shape with a broad base and narrow top
C) An hourglass shape with narrow middle layers
D) A circular structure with no defined layers
Answer: C
Explanation: The EvoArch model represents the Internet as an hourglass shape where the outer
bands (application and physical layers) are more frequently modified, and the inner layers (IP at
the center) are more stable and difficult to alter. This model captures the evolutionary dynamics
of the Internet architecture, where the narrow waist at the IP layer has proven remarkably stable
while technologies at the edges have evolved rapidly.
