Software‑Defined Networking improves network elasticity and agility, but its promises must be validated through rigorous testing. As SDN introduces new challenges in reliability, scalability, and security, it is essential to assess controller behavior and network resilience. Key SDN test objectives include verifying programmability across multi‑vendor environments, ensuring scalability when programming millions of traffic‑engineering paths, measuring performance in how quickly these paths are applied, and confirming reliability through fast recovery from failures. Testing also validates redundancy, load sharing, state synchronization, and protection against malicious or DDoS attacks to ensure a secure and resilient SDN ecosystem.

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