300-420 Question 208
Select 3An enterprise organization is designing a WAN architecture to ensure high availability for its hybrid cloud solution. The design must support failover between on-premises data centers and cloud-hosted applications while maintaining application performance during outages. Which design considerations would best meet these requirements?
- A
Implement dual redundant VPN tunnels between the on-premises data centers and the cloud.
- B
Deploy a software-defined WAN (SD-WAN) solution to dynamically reroute traffic based on real-time performance metrics.
- C
Use a single MPLS connection for both on-premises and cloud connectivity to reduce complexity.
- D
Configure equal-cost multi-path (ECMP) routing between on-premises sites and cloud endpoints.
- E
Rely on the default failover mechanisms provided by cloud service providers without additional WAN design changes.
Show answer and explanation
Correct answers: A, B, D
Explanation
To design high availability for a hybrid cloud WAN, redundancy, dynamic traffic management, and multipath routing are crucial. Dual redundant VPN tunnels provide fault tolerance, SD-WAN enables dynamic rerouting to optimize performance, and ECMP routing enhances path redundancy. A single MPLS connection and reliance on cloud provider defaults do not meet the high availability or performance goals required for enterprise WAN design.
- A. Correct.
Implementing dual redundant VPN tunnels ensures failover in case one tunnel fails, providing a highly available connection between on-premises and cloud.
- B. Correct.
Deploying an SD-WAN solution enhances WAN performance by dynamically rerouting traffic based on link quality and real-time metrics, which ensures application performance during outages.
- C. Incorrect.
Using a single MPLS connection introduces a single point of failure, which does not align with high availability requirements.
- D. Correct.
ECMP routing allows multiple paths to be used simultaneously, improving redundancy and failover capabilities for on-premises and cloud traffic.
- E. Incorrect.
Relying solely on cloud service providers' default failover mechanisms does not address WAN-level redundancy or performance considerations, and additional design changes are needed for true high availability.