Software DefineD networking
(SDn) Practice exam 100 queStionS
anD anSwerS aLreaDY graDeD a_+
Level: ICT / Networking Professional
Format: 100 Multiple Choice Questions (MCQs) with Correct Answers and Explanations
PART 1: QUESTIONS 1–25
1. What does SDN stand for?
A. Secure Data Network
B. Software Defined Networking
C. System Data Node
D. Software Digital Network
Answer: B
Rationale: SDN means Software Defined Networking, a networking approach that separates
network control from forwarding functions.
2. The main concept behind SDN is:
A. Increasing hardware dependency
B. Separating control plane and data plane
C. Removing network devices
D. Eliminating IP addresses
Answer: B
Rationale: SDN separates the control logic from network hardware, allowing centralized
management.
1
,3. In traditional networking, the control plane is:
A. Responsible for forwarding packets
B. Responsible for making routing decisions
C. Responsible for storing files
D. Responsible for encryption only
Answer: B
Rationale: The control plane determines where traffic should go.
4. The data plane in SDN is responsible for:
A. Making routing policies
B. Managing applications
C. Forwarding packets
D. User authentication
Answer: C
Rationale: The data plane executes forwarding decisions made by the controller.
5. The central component of an SDN architecture is the:
A. Router
B. Switch
C. SDN Controller
D. Firewall
Answer: C
Rationale: The SDN controller provides centralized network control.
6. Which protocol is commonly associated with communication between SDN controllers and
switches?
A. FTP
B. HTTP
C. OpenFlow
D. SMTP
2
, Answer: C
Rationale: OpenFlow is a key protocol used for SDN communication.
7. OpenFlow operates between the:
A. Application layer and user layer
B. Controller and switches
C. Database and server
D. Router and firewall
Answer: B
Rationale: OpenFlow enables communication between the SDN controller and forwarding
devices.
8. The SDN controller is often described as the:
A. Network brain
B. Network cable
C. Storage device
D. Physical switch
Answer: A
Rationale: The controller makes centralized decisions for the network.
9. Which layer contains business applications in SDN?
A. Data plane
B. Control plane
C. Application plane
D. Hardware plane
Answer: C
Rationale: The application plane contains network applications and services.
10. SDN improves network management by providing:
A. Decentralized control
B. Manual configuration only
3
(SDn) Practice exam 100 queStionS
anD anSwerS aLreaDY graDeD a_+
Level: ICT / Networking Professional
Format: 100 Multiple Choice Questions (MCQs) with Correct Answers and Explanations
PART 1: QUESTIONS 1–25
1. What does SDN stand for?
A. Secure Data Network
B. Software Defined Networking
C. System Data Node
D. Software Digital Network
Answer: B
Rationale: SDN means Software Defined Networking, a networking approach that separates
network control from forwarding functions.
2. The main concept behind SDN is:
A. Increasing hardware dependency
B. Separating control plane and data plane
C. Removing network devices
D. Eliminating IP addresses
Answer: B
Rationale: SDN separates the control logic from network hardware, allowing centralized
management.
1
,3. In traditional networking, the control plane is:
A. Responsible for forwarding packets
B. Responsible for making routing decisions
C. Responsible for storing files
D. Responsible for encryption only
Answer: B
Rationale: The control plane determines where traffic should go.
4. The data plane in SDN is responsible for:
A. Making routing policies
B. Managing applications
C. Forwarding packets
D. User authentication
Answer: C
Rationale: The data plane executes forwarding decisions made by the controller.
5. The central component of an SDN architecture is the:
A. Router
B. Switch
C. SDN Controller
D. Firewall
Answer: C
Rationale: The SDN controller provides centralized network control.
6. Which protocol is commonly associated with communication between SDN controllers and
switches?
A. FTP
B. HTTP
C. OpenFlow
D. SMTP
2
, Answer: C
Rationale: OpenFlow is a key protocol used for SDN communication.
7. OpenFlow operates between the:
A. Application layer and user layer
B. Controller and switches
C. Database and server
D. Router and firewall
Answer: B
Rationale: OpenFlow enables communication between the SDN controller and forwarding
devices.
8. The SDN controller is often described as the:
A. Network brain
B. Network cable
C. Storage device
D. Physical switch
Answer: A
Rationale: The controller makes centralized decisions for the network.
9. Which layer contains business applications in SDN?
A. Data plane
B. Control plane
C. Application plane
D. Hardware plane
Answer: C
Rationale: The application plane contains network applications and services.
10. SDN improves network management by providing:
A. Decentralized control
B. Manual configuration only
3
