300-420 Question #379: Real Exam Question with Answer & Explanation

Question

What is the main purpose of the Cisco SD-Access underlay design?

Options

• Ato enable automated network provisioning and configuration
• Bto provide network segmentation and isolation for security
• Cto support advanced firewall and IPS features
• Dto optimize network traffic routing and load-balancing

Explanation

{"question_number": 3, "question": "What is the main purpose of the Cisco SD-Access underlay design?", "correct_answer": "D. to optimize network traffic routing and load-balancing", "explanation": "In Cisco SD-Access, the underlay is the physical IP network that interconnects all fabric nodes (edge, border, and control-plane nodes). It is purpose-built to provide fast-converging, loop-free, and load-balanced IP transport for the VXLAN overlay tunnels that carry user traffic. Cisco recommends IS-IS as the underlay routing protocol and ECMP (Equal-Cost Multi-Path) for load distribution across multiple paths. Automated provisioning (option A) belongs to the management plane (DNA/Catalyst Center). Network segmentation and security (option B) are handled by the overlay using VNs and SGTs. Advanced firewall/IPS features (option C) are not a function of the underlay at all.", "generated_by": "claude-sonnet", "llm_judge_score": 4}

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