300-420 Question #106: Real Exam Question with Answer & Explanation

Question

An engineer must propose a solution for a campus network that includes the capability to create multiple Layer 3 virtual networks. Each network must have its own addressing structure and routing table for data forwarding. The solution must be scalable to support hundreds of virtual networks and allow simple configuration and management with minimal administrative overhead. Which solution does the engineer recommend?

Options

• Ahop-by-hop EVN
• Bmultihop MPLS core
• Cmultihop IPsec tunneling
• Dhop-by-hop VRF-Lite

Explanation

{"question_number": 7, "question": "Which solution supports hundreds of Layer 3 virtual networks with separate routing tables and minimal administrative overhead in a campus network?", "correct_answer": "A", "explanation": "Hop-by-hop EVN (Easy Virtual Network) is the correct answer. EVN is Cisco's simplification of VRF-Lite for campus environments. It uses 802.1Q trunk links to automatically propagate VRF membership information between devices without requiring manual VRF configuration on every intermediate router. This dramatically reduces administrative overhead when scaling to hundreds of virtual networks. Each EVN has its own routing table and address space, satisfying the Layer 3 isolation requirement. Option D (VRF-Lite) requires manual configuration at every hop, making it operationally burdensome at scale. Option B (multihop MPLS) is complex, typically provider-grade infrastructure, and introduces significant overhead for a campus deployment. Option C (IPsec tunneling) is not designed for campus-scale Layer 3 virtualization.", "generated_by": "claude-sonnet", "llm_judge_score": 3}

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