What are two functions of an SDN controller? (Choose two)

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.

SDN controllers are responsible for orchestrating and coordinating various virtualized network services and topologies (VTNs), allowing for flexible and programmatic network segmentation and resource allocation.

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.

The SDN controller maintains a comprehensive view of the entire network topology, enabling it to manage and program network devices centrally for optimal traffic flow and resource utilization.

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.