What is required in order to implement a Software-Defined Network (SDN)? (Select two)

SDN requires that the underlying network infrastructure support redundant data pathways so the SDN controller can dynamically direct and load-balance traffic across available links, enabling failover and bandwidth optimization as part of centralized control.

Flow evaluation and QoS-based prioritization is a fundamental requirement for SDN because the controller must classify traffic and enforce policies that give high-value flows preferential forwarding treatment across the entire network fabric.

SDN is architecturally defined by the separation of the infrastructure layer, control layer, and application layer - merging them into a single physical switch directly contradicts the SDN model and its core design principle.

Programmable modification of forwarding rules describes a specific protocol-level mechanism such as OpenFlow and represents one way SDN may be implemented, but it is not a universal prerequisite infrastructure requirement for all SDN architectures.

Dynamic application of packet policy is a capability that SDN delivers as an outcome once deployed, not a prerequisite infrastructure requirement that must exist before SDN can be implemented.