WGU D415 Software Defined Networking
Exam Coverage
○ SDN architecture
○ Control and data planes
○ SDN controllers
○ Southbound interfaces
○ Network policy
○ Automation
○ Controller troubleshooting
○ Virtual segmentation
○ Controller security
○ High availability and change management
1. Which action is most appropriate when a software-defined network
separates control decisions from packet forwarding during a real-world
assessment, installation, or operational decision? The decision should be
based on evidence and the requirements applicable to the specific situation.
○ remove switches
○ use DNS as the controller
,● use a centralized or logically centralized control architecture to program network
behavior
○ place every rule only in cabling
Rationale: The correct choice addresses the core requirement or principle in the
scenario and provides a safer, more reliable, and verifiable response than the other
options.
2. A professional encounters this situation: an SDN controller must
communicate with programmable network devices What should be done
next to achieve the safest and most reliable result? The decision should be
based on evidence and the requirements applicable to the specific situation.
○ disable device communication
● use a supported southbound interface or protocol appropriate to the controller and
devices
○ use SMTP for forwarding rules
○ use a printer protocol
Rationale: The correct choice addresses the core requirement or principle in the
scenario and provides a safer, more reliable, and verifiable response than the other
options.
,3. Before the system or program continues, what should happen when an
SDN application needs network-wide policy according to accepted technical
or public health practice? The decision should be based on evidence and the
requirements applicable to the specific situation.
● use controller-based policy and intent mechanisms to apply consistent behavior
○ configure random devices independently
○ remove central policy
○ ignore topology
Rationale: The correct choice addresses the core requirement or principle in the
scenario and provides a safer, more reliable, and verifiable response than the other
options.
4. Why is the following response important when a controller loses
communication with a managed switch while applying the relevant
principles and requirements? The decision should be based on evidence and
the requirements applicable to the specific situation.
○ ignore control traffic
○ change application passwords
○ replace all switches immediately
, ● verify controller reachability, control-channel status, device configuration, and
fail-safe behavior
Rationale: The correct choice addresses the core requirement or principle in the
scenario and provides a safer, more reliable, and verifiable response than the other
options.
5. During routine review, an SDN design requires security controls Which
choice best addresses the underlying issue rather than only the visible
symptom? The decision should be based on evidence and the requirements
applicable to the specific situation.
○ share administrator credentials
○ disable logs
● apply authentication, authorization, encryption, segmentation, monitoring, and
controller protection
○ trust every controller user
Rationale: The correct choice addresses the core requirement or principle in the
scenario and provides a safer, more reliable, and verifiable response than the other
options.
6. When a network administrator wants to automate configuration across
many devices what is the best next step for the responsible professional to
Exam Coverage
○ SDN architecture
○ Control and data planes
○ SDN controllers
○ Southbound interfaces
○ Network policy
○ Automation
○ Controller troubleshooting
○ Virtual segmentation
○ Controller security
○ High availability and change management
1. Which action is most appropriate when a software-defined network
separates control decisions from packet forwarding during a real-world
assessment, installation, or operational decision? The decision should be
based on evidence and the requirements applicable to the specific situation.
○ remove switches
○ use DNS as the controller
,● use a centralized or logically centralized control architecture to program network
behavior
○ place every rule only in cabling
Rationale: The correct choice addresses the core requirement or principle in the
scenario and provides a safer, more reliable, and verifiable response than the other
options.
2. A professional encounters this situation: an SDN controller must
communicate with programmable network devices What should be done
next to achieve the safest and most reliable result? The decision should be
based on evidence and the requirements applicable to the specific situation.
○ disable device communication
● use a supported southbound interface or protocol appropriate to the controller and
devices
○ use SMTP for forwarding rules
○ use a printer protocol
Rationale: The correct choice addresses the core requirement or principle in the
scenario and provides a safer, more reliable, and verifiable response than the other
options.
,3. Before the system or program continues, what should happen when an
SDN application needs network-wide policy according to accepted technical
or public health practice? The decision should be based on evidence and the
requirements applicable to the specific situation.
● use controller-based policy and intent mechanisms to apply consistent behavior
○ configure random devices independently
○ remove central policy
○ ignore topology
Rationale: The correct choice addresses the core requirement or principle in the
scenario and provides a safer, more reliable, and verifiable response than the other
options.
4. Why is the following response important when a controller loses
communication with a managed switch while applying the relevant
principles and requirements? The decision should be based on evidence and
the requirements applicable to the specific situation.
○ ignore control traffic
○ change application passwords
○ replace all switches immediately
, ● verify controller reachability, control-channel status, device configuration, and
fail-safe behavior
Rationale: The correct choice addresses the core requirement or principle in the
scenario and provides a safer, more reliable, and verifiable response than the other
options.
5. During routine review, an SDN design requires security controls Which
choice best addresses the underlying issue rather than only the visible
symptom? The decision should be based on evidence and the requirements
applicable to the specific situation.
○ share administrator credentials
○ disable logs
● apply authentication, authorization, encryption, segmentation, monitoring, and
controller protection
○ trust every controller user
Rationale: The correct choice addresses the core requirement or principle in the
scenario and provides a safer, more reliable, and verifiable response than the other
options.
6. When a network administrator wants to automate configuration across
many devices what is the best next step for the responsible professional to
