300-420 exam dumps

300-420 practice question 210 of 323

Designing Cisco Enterprise Networks. Professional level, Cisco. Free question with the correct answer and a full explanation.

300-420 Question 210

Select 3

An enterprise is designing a highly available WAN architecture to support on-premises, hybrid, and cloud-based applications. The design must ensure continuous connectivity even during link or device failures. Which of the following design considerations would best meet these high availability requirements?

  1. A

    Implement dual-homed connections to different ISPs for critical sites.

  2. B

    Leverage SD-WAN to dynamically reroute traffic based on real-time link performance.

  3. C

    Configure static routing across all WAN links to simplify failover.

  4. D

    Use cloud-based WAN optimization for all traffic to the cloud.

  5. E

    Deploy redundant edge routers at each critical site.

Show answer and explanation

Correct answers: A, B, E

Explanation

The best design for high availability in an enterprise WAN involves addressing redundancy at multiple layers, including ISP connections, dynamic traffic management, and device-level failover. Dual-homed ISP connections prevent provider outages from affecting connectivity. SD-WAN adds dynamic routing to handle link quality issues in real time, while redundant edge routers prevent a single device failure from disrupting service. Static routing and WAN optimization do not directly address high availability in this context.

  • A. Correct.

    This is correct because dual-homed connections to different ISPs ensure redundancy in case one provider experiences an outage.

  • B. Correct.

    This is correct because SD-WAN can dynamically reroute traffic based on link performance, ensuring high availability and resilience.

  • C. Incorrect.

    This is incorrect because static routing does not automatically adapt to failures, which can lead to service disruption.

  • D. Incorrect.

    This is incorrect because while cloud-based WAN optimization can improve performance, it does not inherently provide high availability or handle link or device failures.

  • E. Correct.

    This is correct because deploying redundant edge routers ensures device-level resilience and prevents single points of failure at critical sites.

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