WGU D415 | Software-Defined Networking (SDN) |
Objective Assessment (Oa) Exam| NEWEST 2026 ||
MOST RECENT EXAM 2026|2027 ACTUAL COMPLETE
REAL EXAM QUESTIONS AND CORRECT ANSWERS
(VERIFIED ANSWERS) ALREADY GRADED A+ |
GUARANTEED SUCCESS!! NEWEST EXAM | JUST
RELEASED!!
Which component of an SDN architecture is primarily responsible for
making routing and forwarding decisions?
A. Control plane B. Data plane C. Physical cabling layer D. Network
interface card
Answer: A. Control plane.
Rationale: The control plane makes decisions about where traffic
should go and which forwarding rules should be installed. The data
plane executes those rules by forwarding packets. In an SDN
environment, a controller often coordinates control decisions across
multiple switches and other network devices.
What is the primary responsibility of the data plane in an SDN-enabled
switch?
A. Defining organization-wide security policies B. Managing
application requirements C. Developing network-wide routing
strategies D. Forwarding packets according to installed rules
Answer: D. Forwarding packets according to installed rules.
,Rationale: The data plane performs packet-processing operations,
including forwarding, dropping, and sometimes modifying packets
based on flow-table entries or other forwarding mechanisms. The
controller generally determines the policies and rules, while the switch
applies them at forwarding time.
What is a major advantage of using an SDN controller?
A. It makes every network connection physically redundant. B. It
removes the need for network security controls. C. It provides a
logically centralized point for coordinating network behavior. D. It
guarantees that network failures never occur.
Answer: C. It provides a logically centralized point for coordinating
network behavior.
Rationale: An SDN controller maintains a network-wide or domain-
wide view and coordinates configuration and forwarding policies. This
can simplify management and improve consistency. However, logical
centralization does not require a single physical controller, and SDN
does not guarantee uninterrupted service or eliminate security
requirements.
Which statement best describes the relationship between the SDN
control plane and data plane?
A. The control plane determines forwarding behavior, and the data
plane executes forwarding actions. B. The data plane creates business
applications, and the control plane stores user files. C. Both planes
perform exactly the same tasks. D. The control plane only operates
when the network has no traffic.
,Answer: A. The control plane determines forwarding behavior, and the
data plane executes forwarding actions.
Rationale: The control plane calculates or coordinates network
decisions, while the data plane processes packets using the rules and
instructions available to it. Separating these functions makes network
behavior easier to program and manage. The planes have distinct
responsibilities even though they work together to deliver traffic.
What is the purpose of a northbound interface in an SDN architecture?
A. To connect switches directly to their power supplies B. To enable
communication between the controller and higher-level applications C.
To connect end-user computers to wireless access points D. To replace
the controller's internal operating system
Answer: B. To enable communication between the controller and
higher-level applications.
Rationale: Northbound interfaces allow applications and orchestration
systems to request network services, retrieve network information, or
express policies through controller APIs. These interfaces abstract
many low-level implementation details. They are different from
southbound interfaces, which allow the controller to communicate with
network devices.
What is the main purpose of a southbound interface in SDN?
A. To provide a user interface for business managers B. To connect
applications to databases C. To translate email messages into network
packets D. To enable the controller to communicate with forwarding
devices
, Answer: D. To enable the controller to communicate with forwarding
devices.
Rationale: Southbound interfaces carry instructions, configuration
information, or network-state information between the SDN controller
and infrastructure devices. OpenFlow is a well-known example of a
southbound protocol, although SDN systems may also use other
protocols and device APIs.
Which characteristic most clearly distinguishes SDN from traditional
network management?
A. SDN can operate only on wireless networks. B. SDN eliminates all
network protocols. C. SDN supports programmable control of network
behavior through software. D. SDN requires every switch to make all
decisions independently.
Answer: C. SDN supports programmable control of network behavior
through software.
Rationale: SDN enables network policies and behavior to be controlled
programmatically, often through a controller and APIs. Traditional
networks commonly rely more heavily on device-by-device
configuration and distributed control mechanisms. SDN still uses
network protocols and may coexist with conventional networking
equipment.
What does the term logically centralized control mean in SDN?
A. Network control appears coordinated from a central perspective,
even if multiple controller instances are deployed. B. Every forwarding
decision must be made by one physical switch. C. All network devices
Objective Assessment (Oa) Exam| NEWEST 2026 ||
MOST RECENT EXAM 2026|2027 ACTUAL COMPLETE
REAL EXAM QUESTIONS AND CORRECT ANSWERS
(VERIFIED ANSWERS) ALREADY GRADED A+ |
GUARANTEED SUCCESS!! NEWEST EXAM | JUST
RELEASED!!
Which component of an SDN architecture is primarily responsible for
making routing and forwarding decisions?
A. Control plane B. Data plane C. Physical cabling layer D. Network
interface card
Answer: A. Control plane.
Rationale: The control plane makes decisions about where traffic
should go and which forwarding rules should be installed. The data
plane executes those rules by forwarding packets. In an SDN
environment, a controller often coordinates control decisions across
multiple switches and other network devices.
What is the primary responsibility of the data plane in an SDN-enabled
switch?
A. Defining organization-wide security policies B. Managing
application requirements C. Developing network-wide routing
strategies D. Forwarding packets according to installed rules
Answer: D. Forwarding packets according to installed rules.
,Rationale: The data plane performs packet-processing operations,
including forwarding, dropping, and sometimes modifying packets
based on flow-table entries or other forwarding mechanisms. The
controller generally determines the policies and rules, while the switch
applies them at forwarding time.
What is a major advantage of using an SDN controller?
A. It makes every network connection physically redundant. B. It
removes the need for network security controls. C. It provides a
logically centralized point for coordinating network behavior. D. It
guarantees that network failures never occur.
Answer: C. It provides a logically centralized point for coordinating
network behavior.
Rationale: An SDN controller maintains a network-wide or domain-
wide view and coordinates configuration and forwarding policies. This
can simplify management and improve consistency. However, logical
centralization does not require a single physical controller, and SDN
does not guarantee uninterrupted service or eliminate security
requirements.
Which statement best describes the relationship between the SDN
control plane and data plane?
A. The control plane determines forwarding behavior, and the data
plane executes forwarding actions. B. The data plane creates business
applications, and the control plane stores user files. C. Both planes
perform exactly the same tasks. D. The control plane only operates
when the network has no traffic.
,Answer: A. The control plane determines forwarding behavior, and the
data plane executes forwarding actions.
Rationale: The control plane calculates or coordinates network
decisions, while the data plane processes packets using the rules and
instructions available to it. Separating these functions makes network
behavior easier to program and manage. The planes have distinct
responsibilities even though they work together to deliver traffic.
What is the purpose of a northbound interface in an SDN architecture?
A. To connect switches directly to their power supplies B. To enable
communication between the controller and higher-level applications C.
To connect end-user computers to wireless access points D. To replace
the controller's internal operating system
Answer: B. To enable communication between the controller and
higher-level applications.
Rationale: Northbound interfaces allow applications and orchestration
systems to request network services, retrieve network information, or
express policies through controller APIs. These interfaces abstract
many low-level implementation details. They are different from
southbound interfaces, which allow the controller to communicate with
network devices.
What is the main purpose of a southbound interface in SDN?
A. To provide a user interface for business managers B. To connect
applications to databases C. To translate email messages into network
packets D. To enable the controller to communicate with forwarding
devices
, Answer: D. To enable the controller to communicate with forwarding
devices.
Rationale: Southbound interfaces carry instructions, configuration
information, or network-state information between the SDN controller
and infrastructure devices. OpenFlow is a well-known example of a
southbound protocol, although SDN systems may also use other
protocols and device APIs.
Which characteristic most clearly distinguishes SDN from traditional
network management?
A. SDN can operate only on wireless networks. B. SDN eliminates all
network protocols. C. SDN supports programmable control of network
behavior through software. D. SDN requires every switch to make all
decisions independently.
Answer: C. SDN supports programmable control of network behavior
through software.
Rationale: SDN enables network policies and behavior to be controlled
programmatically, often through a controller and APIs. Traditional
networks commonly rely more heavily on device-by-device
configuration and distributed control mechanisms. SDN still uses
network protocols and may coexist with conventional networking
equipment.
What does the term logically centralized control mean in SDN?
A. Network control appears coordinated from a central perspective,
even if multiple controller instances are deployed. B. Every forwarding
decision must be made by one physical switch. C. All network devices
