300-420 Question 210
Select 3An 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?
- A
Implement dual-homed connections to different ISPs for critical sites.
- B
Leverage SD-WAN to dynamically reroute traffic based on real-time link performance.
- C
Configure static routing across all WAN links to simplify failover.
- D
Use cloud-based WAN optimization for all traffic to the cloud.
- 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.