200-301 Question #491: Real Exam Question with Answer & Explanation

Question

What is the function of a controller in controller-based networking?

Options

• AIt serves as the centralized management point of an SDN architecture.
• BIt centralizes the data plane for the network.
• CIt is the card on a core router that maintains all routing decisions for a campus.
• DIt is a pair of core routers that maintain all routing decisions for a campus

Explanation

An SDN controller is an application in a software-defined networking (SDN) architecture that manages flow control for improved network management and application performance. The SDN controller platform typically runs on a server and uses protocols to tell switches where to send SDN controllers direct traffic according to forwarding policies that a network operator puts in place, thereby minimizing manual configurations for individual network devices. By taking the control plane off of the network hardware and running it instead as software, the centralized controller facilitates automated network management and makes it easier to integrate and administer business applications. In effect, the SDN controller serves as a sort of operating system (OS) for the network. The controller is the core of a software-defined network. It resides between network devices at one end of the network and applications at the other end. Any communication between applications and network devices must go through the controller.

No community discussion yet for this question.