300-420 Question #375: Real Exam Question with Answer & Explanation

Question

An architect must design a topology for a WAN network that satisfies these requirements: - Devices must be able to make informed decisions. - Suboptimal paths are allowed only in case of a failure. - Backup paths must always be available. Which topology must the architect select?

Options

• Afull mesh
• BClos
• Cpartial mesh
• Dhub and spoke

Explanation

{"question_number": 1, "question": "An architect must design a topology for a WAN network that satisfies these requirements: - Devices must be able to make informed decisions. - Suboptimal paths are allowed only in case of a failure. - Backup paths must always be available. Which topology must the architect select?", "correct_answer": "A. full mesh", "explanation": "A full mesh topology connects every device directly to every other device. This satisfies all three requirements: (1) because every node has a direct link to all peers, routing protocols can exchange complete topology information, enabling truly informed path decisions; (2) in normal operation the optimal direct path is used, and a suboptimal alternate path is only taken when the primary link fails; (3) because N-1 redundant paths exist for each node, a backup is always available regardless of any single failure. Hub-and-spoke fails because the hub is a single point of failure with no backup path. Partial mesh cannot guarantee a backup path exists for every device pair. Clos is a data-center switching fabric architecture, not a WAN topology.", "generated_by": "claude-sonnet", "llm_judge_score": 4}

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