200-301 Question 24
Select 3An organization is deploying a new Software-Defined Network (SDN) solution. The network administrator has decided to implement a controller-based architecture. Which of the following are primary functions of a network controller in such an architecture?
- A
Centralized management of network devices and configurations
- B
Directly forwarding packets at the data plane
- C
Providing APIs for application integration and automation
- D
Monitoring network traffic and applying policies dynamically
- E
Replacing the need for physical routers and switches in the network
Show answer and explanation
Correct answers: A, C, D
Explanation
Network controllers in a Software-Defined Network (SDN) architecture operate at the control plane, providing centralized management, monitoring, and automation capabilities. They do not handle data plane tasks such as packet forwarding, nor do they replace physical network devices. Instead, they enhance the network's functionality by enabling dynamic policy enforcement and application integration through APIs.
- A. Correct.
Correct: One of the primary functions of a network controller is to provide centralized management, enabling configuration and control of multiple network devices from a single point.
- B. Incorrect.
Incorrect: Packet forwarding is handled by the data plane on individual devices (such as switches and routers). The controller operates primarily at the control plane level.
- C. Correct.
Correct: Controllers often offer APIs that enable integration with external applications, facilitating automation and advanced network management.
- D. Correct.
Correct: Controllers can monitor network traffic and apply policies dynamically to optimize performance and enforce security.
- E. Incorrect.
Incorrect: Physical routers and switches are still needed in the network to handle hardware-level forwarding and connectivity. Controllers complement these devices rather than replacing them.