SAA-C03 · Question #669
SAA-C03 Question #669: Real Exam Question with Answer & Explanation
The correct answer is B: Run the application servers in an Auto Scaling group behind an internal Application Load. Placing the application servers in an Auto Scaling group behind an internal Application Load Balancer (ALB) allows you to scale the application tier horizontally without changing application code. The internal ALB keeps all traffic inside the VPC, and updating the private Route 5
Question
A company uses a three-tier application architecture that includes web servers, application servers, and a database cluster inside the same VPC. The traffic between the tiers must remain inside the VPC. The web servers use Amazon Route 53 and a private hosted zone to resolve the application name to application server IP addresses by using a round-robin method. The application tier uses a fixed number of Amazon EC2 instances. The EC2 instances are near their CPU usage capacity. The company wants to add scalability to the application tier without changing the application code. Which solution will meet these requirements?
Options
- ACreate an Amazon Simple Queue Service (Amazon SQS) queue between the web tier and the
- BRun the application servers in an Auto Scaling group behind an internal Application Load
- CCreate an Amazon Simple Queue Service (Amazon SQS) queue between the application tier and
- DRun the application servers in an Auto Scaling group behind an internet-facing Application Load
Explanation
Placing the application servers in an Auto Scaling group behind an internal Application Load Balancer (ALB) allows you to scale the application tier horizontally without changing application code. The internal ALB keeps all traffic inside the VPC, and updating the private Route 53 record to point to the ALB means the web tier still uses DNS to reach the app tier, but now benefits from load balancing and automatic scaling.
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