ANS-C01 Question 419
Select 3You are designing a high-traffic web application that requires low latency, high availability, and the ability to handle traffic spikes. Your architecture needs to ensure that traffic is distributed evenly across multiple EC2 instances in two different AWS Regions, with failover capabilities. Which configuration would best meet these requirements?
- A
Use an Application Load Balancer (ALB) in each Region and Route 53 with geolocation routing to distribute traffic across Regions.
- B
Use a Network Load Balancer (NLB) in each Region and Route 53 with latency-based routing to distribute traffic across Regions.
- C
Deploy an ALB in one Region and configure Route 53 with weighted routing to distribute traffic between Regions.
- D
Use a Global Accelerator to route traffic dynamically to the closest healthy endpoint across Regions.
- E
Use a single ALB in one Region and configure Auto Scaling to handle traffic spikes.
Show answer and explanation
Correct answers: A, B, D
Explanation
To ensure low latency, high availability, and the ability to handle traffic spikes across multiple Regions, you should use a combination of load balancing within each Region and global traffic distribution. Network Load Balancers (NLBs) are suitable for handling high traffic, and Route 53 with latency-based routing ensures traffic is directed to the Region with the lowest latency. Additionally, AWS Global Accelerator provides global traffic optimization, dynamic routing to the closest healthy endpoint, and failover capabilities, making it a robust solution for meeting the requirements.
- A. Correct.
This option is valid because an Application Load Balancer (ALB) can distribute traffic at the application layer, and Route 53 with geolocation routing can direct users to the nearest Region based on their geographic location. However, it does not dynamically account for latency and may not always ensure the lowest latency.
- B. Correct.
This option is correct because Network Load Balancers (NLBs) are highly performant and can handle sudden traffic spikes. Route 53 with latency-based routing ensures that traffic is routed to the Region with the lowest latency, improving performance for end users.
- C. Incorrect.
This option is incorrect because deploying an ALB in only one Region creates a single point of failure and does not leverage multi-Region capabilities for high availability.
- D. Correct.
This option is correct because AWS Global Accelerator provides global traffic routing, reduces latency by directing users to the closest healthy endpoint, and offers failover capabilities across Regions.
- E. Incorrect.
This option is incorrect because using a single ALB in one Region does not leverage multi-Region deployment, which is essential for high availability and disaster recovery.