200-301 · Question #406
200-301 Question #406: Real Exam Question with Answer & Explanation
The correct answer is B: coordinating VTNs. An SDN controller acts as the centralized brain of a Software-Defined Network, performing critical functions like coordinating Virtualized Network Topologies (VTNs) and managing the overall network topology. It provides a global view of the network and programs data plane devices
Question
What are two functions of an SDN controller? (Choose two)
Options
- ALayer 2 forwarding
- Bcoordinating VTNs
- Ctracking hosts
- Dmanaging the topology
- Eprotecting against DDoS attacks
Explanation
An SDN controller acts as the centralized brain of a Software-Defined Network, performing critical functions like coordinating Virtualized Network Topologies (VTNs) and managing the overall network topology. It provides a global view of the network and programs data plane devices.
Common mistakes.
- A. Layer 2 forwarding is primarily a function of the data plane devices (switches), which receive instructions from the SDN controller, rather than a direct function of the controller itself.
- C. While an SDN controller might have information about hosts, actively 'tracking hosts' is more often a function of specific network monitoring tools or security systems rather than a core function of the controller's control plane duties.
- E. Protecting against DDoS attacks is a security function that might be implemented through an SDN controller by programming network policies, but it is not a direct, core function of the controller itself.
Concept tested. Software-Defined Networking (SDN) controller functions
Reference. https://www.cisco.com/c/en/us/products/cloud-systems-management/what-is-sdn.html
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