300-435 Question #20: Real Exam Question with Answer & Explanation

Question

Which two features are foundations of a software-defined network instead of a traditional network? (Choose two.)

Options

• AControl plane and data plane are tightly coupled
• Bbuilt upon a robust software stack
• Crequires device by device level configurations
• Dautomated through expressed intent to a software controller
• Erequires significant physical hardware resources

Explanation

Software-Defined Networking (SDN) is fundamentally built upon a robust software stack, enabling network automation through an intent-based software controller.

Common mistakes.

• A. In a traditional network, the control plane (routing decisions) and data plane (packet forwarding) are tightly coupled within each network device, whereas SDN aims to decouple them.
• C. Traditional networks require manual, device-by-device configuration, while SDN seeks to abstract and centralize control, reducing the need for individual device configurations.
• E. While networks require hardware, "significant physical hardware resources" is not a distinguishing feature of SDN compared to traditional networks; SDN's defining features relate to control and programmability rather than raw hardware scale.

Concept tested. SDN fundamental principles

Reference. https://www.cisco.com/c/en/us/solutions/enterprise-networks/software-defined-networking/what-is-sdn.html

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