Software-Defined Networking (SDN) is a revolutionary approach to network management that
separates the control plane from the data (forwarding) plane. Let’s analyze each option:
A . It must manage networks through the use of containers and repositories.
Incorrect: While containers and repositories are important in cloud-native environments, they are
not a requirement for SDN. SDN focuses on programmability and centralized control, not
containerization.
B . It manages networks by separating the data forwarding plane from the control plane.
Correct: SDN separates the control plane (decision-making) from the data forwarding plane (packet
forwarding). This separation enables centralized control, programmability, and dynamic network
management.
C . It applies security policies individually to each separate node.
Incorrect: SDN applies security policies centrally through the SDN controller, not individually to each
node. Centralized policy enforcement is one of the key advantages of SDN.
D . It manages networks by merging the data forwarding plane with the control plane.
Incorrect: Merging the forwarding and control planes contradicts the fundamental principle of SDN.
The separation of these planes is what enables SDN’s flexibility and programmability.
Why This Answer?
Separation of Planes: By decoupling the control plane from the forwarding plane, SDN enables
centralized control over network devices. This architecture simplifies network management,
improves scalability, and supports automation.
JNCIA Cloud Reference:
The JNCIA-Cloud certification covers SDN as a core concept in cloud networking. Understanding the
separation of the control and forwarding planes is essential for designing and managing modern
cloud environments.
For example, Juniper Contrail serves as an SDN controller, centralizing control over network devices
and enabling advanced features like network automation and segmentation.
Reference:
Open Networking Foundation (ONF) SDN Architecture
Juniper JNCIA-Cloud Study Guide: Software-Defined Networking
