ANS-C01 Question 76
Select 3You are designing an application running on Amazon EC2 instances behind an Application Load Balancer (ALB) in a single AWS Region. During testing, you observe that the ALB is not scaling as expected to handle a surge in traffic, leading to increased latency and connection timeouts. Which of the following factors should you consider to ensure the ALB scales appropriately?
- A
Pre-warm the ALB by contacting AWS Support with traffic patterns if you expect a sudden traffic spike.
- B
Ensure the ALB security group allows inbound traffic from the expected client IP ranges.
- C
Verify that the Elastic Load Balancing quota limits are not exceeded for your AWS account.
- D
Configure the ALB with cross-zone load balancing to distribute traffic evenly across all registered targets.
- E
Ensure that the target group health checks are properly configured and returning healthy status.
Show answer and explanation
Correct answers: A, C, E
Explanation
To ensure an ALB scales appropriately during traffic surges, it is important to consider factors such as pre-warming the ALB for sudden spikes, ensuring account quota limits for Elastic Load Balancing are not exceeded, and confirming that target group health checks are properly configured. These aspects directly affect the ALB's scaling behavior and ability to handle traffic efficiently. On the other hand, while security group settings and cross-zone load balancing are important for ALB functionality, they do not directly influence the ALB's scaling capabilities.
- A. Correct.
Pre-warming the ALB by contacting AWS Support can help handle sudden surges in traffic more effectively, especially for unexpected high traffic scenarios.
- B. Incorrect.
While security group settings are important, they do not directly impact the ALB's ability to scale. They control access but do not affect scaling behavior.
- C. Correct.
Elastic Load Balancing has quota limits (e.g., number of load balancers, targets, etc.) that, if exceeded, can prevent the ALB from scaling. Verifying these limits can resolve scaling issues.
- D. Incorrect.
Cross-zone load balancing ensures traffic is distributed evenly across targets in different Availability Zones but does not directly affect the ALB's ability to scale in response to traffic surges.
- E. Correct.
Target group health checks are critical to scaling because unhealthy targets reduce the ALB's capacity to route traffic effectively, impacting overall performance.