,WGU D415 Software Defined Networking Exam 2026 | Most Tested
Questions & Verified Answers | Latest Update | Graded A+
Question 1
What is the primary architectural characteristic that distinguishes
Software-Defined Networking (SDN)?
• A. It tightly couples the control plane and data plane inside each
individual physical router.
• B. It decouples the control plane from the data forwarding plane,
enabling centralized management and programmability.
• C. It relies exclusively on manual command-line configurations on
every switch interface.
• D. It eliminates the need for any physical network hardware or
switches entirely.
Answer: B
Rationale: SDN separates the control plane (where routing decisions are
determined) from the data plane (where packets are moved), allowing
centralized programmability.
Question 2
What is the primary objective of Network Functions Virtualization
(NFV)?
• A. To force all network routing logic to run exclusively on
dedicated proprietary hardware boxes.
, • B. To move network functions from dedicated hardware
appliances to software running on standard commercial off-the-
shelf (COTS) servers.
• C. To completely replace the need for virtual switches and
firewalls in modern cloud architectures.
• D. To convert layer 2 data frames directly into layer 1 analog
waveforms.
Answer: B
Rationale: NFV replaces dedicated hardware appliances with software
running on standard servers, reducing hardware overhead and
deployment time.
Question 3
What are the three main architectural components defined by the
ETSI NFV framework?
• A. Routers, Switches, and Firewalls
• B. Virtual Network Functions (VNFs), Network Functions
Virtualization Infrastructure (NFVI), and NFV Management and
Orchestration (NFV-MANO)
• C. Type 1 Hypervisors, Type 2 Hypervisors, and Bare-metal Servers
• D. Northbound, Southbound, and Eastbound interfaces
Answer: B
Rationale: The ETSI NFV framework is structured around VNFs, the NFVI
underlying platform, and the MANO management plane.
Question 4
, What does NFV-MANO encompass within an NFV architecture?
• A. The physical cooling fans and power distribution units in a
server rack.
• B. All functional blocks, data repositories, reference points, and
interfaces used to manage and orchestrate VNFs and NFVI.
• C. The graphical user interface templates used for end-user web
design.
• D. The low-level ASIC microcode instructions for physical silicon
routers.
Answer: B
Rationale: MANO handles the management, orchestration, and lifecycle
tracking of virtualized network functions and infrastructure resources.
Question 5
What comprises the Network Functions Virtualization Infrastructure
(NFVI)?
• A. Only the optical fiber cables connecting different data centers.
• B. The totality of hardware and software components that build
the environment where VNFs are deployed, including compute,
storage, and networking virtualization layers.
• C. The end-user desktop client computers accessing the cloud.
• D. The manual administrative scripts used for user password
resets.
Answer: B
Questions & Verified Answers | Latest Update | Graded A+
Question 1
What is the primary architectural characteristic that distinguishes
Software-Defined Networking (SDN)?
• A. It tightly couples the control plane and data plane inside each
individual physical router.
• B. It decouples the control plane from the data forwarding plane,
enabling centralized management and programmability.
• C. It relies exclusively on manual command-line configurations on
every switch interface.
• D. It eliminates the need for any physical network hardware or
switches entirely.
Answer: B
Rationale: SDN separates the control plane (where routing decisions are
determined) from the data plane (where packets are moved), allowing
centralized programmability.
Question 2
What is the primary objective of Network Functions Virtualization
(NFV)?
• A. To force all network routing logic to run exclusively on
dedicated proprietary hardware boxes.
, • B. To move network functions from dedicated hardware
appliances to software running on standard commercial off-the-
shelf (COTS) servers.
• C. To completely replace the need for virtual switches and
firewalls in modern cloud architectures.
• D. To convert layer 2 data frames directly into layer 1 analog
waveforms.
Answer: B
Rationale: NFV replaces dedicated hardware appliances with software
running on standard servers, reducing hardware overhead and
deployment time.
Question 3
What are the three main architectural components defined by the
ETSI NFV framework?
• A. Routers, Switches, and Firewalls
• B. Virtual Network Functions (VNFs), Network Functions
Virtualization Infrastructure (NFVI), and NFV Management and
Orchestration (NFV-MANO)
• C. Type 1 Hypervisors, Type 2 Hypervisors, and Bare-metal Servers
• D. Northbound, Southbound, and Eastbound interfaces
Answer: B
Rationale: The ETSI NFV framework is structured around VNFs, the NFVI
underlying platform, and the MANO management plane.
Question 4
, What does NFV-MANO encompass within an NFV architecture?
• A. The physical cooling fans and power distribution units in a
server rack.
• B. All functional blocks, data repositories, reference points, and
interfaces used to manage and orchestrate VNFs and NFVI.
• C. The graphical user interface templates used for end-user web
design.
• D. The low-level ASIC microcode instructions for physical silicon
routers.
Answer: B
Rationale: MANO handles the management, orchestration, and lifecycle
tracking of virtualized network functions and infrastructure resources.
Question 5
What comprises the Network Functions Virtualization Infrastructure
(NFVI)?
• A. Only the optical fiber cables connecting different data centers.
• B. The totality of hardware and software components that build
the environment where VNFs are deployed, including compute,
storage, and networking virtualization layers.
• C. The end-user desktop client computers accessing the cloud.
• D. The manual administrative scripts used for user password
resets.
Answer: B
