When should you choose ALB over alternatives?

Summary

Choose ALB when you need HTTP routing, TLS termination, host/path rules, target health checks, WebSockets, redirects, fixed responses, or routing to EC2/ECS/Lambda targets.

Longer Answer

ALB is best viewed as Layer 7 application load balancer for HTTP and HTTPS traffic. It fits when the workload characteristics align with its strengths rather than when a team simply defaults to a familiar service.

For this question, mention the business and operational drivers: control, scaling shape, security boundaries, cost model, and how the service integrates with EC2, ECS, Lambda targets, ACM, WAF, Cognito/OIDC auth, CloudWatch, S3 access logs, Route 53, Global Accelerator, and CodeDeploy.

Key Points

• ALB is best viewed as Layer 7 application load balancer for HTTP and HTTPS traffic
• It fits when the workload characteristics align with its strengths rather than when a team simply defaults to a familiar service
• For this question, mention the business and operational drivers: control, scaling shape, security boundaries, cost model, and how the service integrates with EC2, ECS, Lambda targets, ACM, WAF, Cognito/OIDC auth, CloudWatch, S3 access logs, Route 53, Global Accelerator, and CodeDeploy
• For 'When should you choose ALB over alternatives?', interviewers are looking for a decision process: state the requirement, name the AWS mechanism, describe the limit or failure mode, and explain how you would verify it in production. For this question, mention the business and operational drivers: control, scaling shape, security boundaries, cost model, and how the service integrates with EC2, ECS, Lambda targets, ACM, WAF, Cognito/OIDC auth, CloudWatch, S3 access logs, Route 53, Global Accelerator, and CodeDeploy.

Use the comparison table to show that you understand tradeoffs rather than memorizing a single preferred service

Comparison / Tradeoffs

Use the comparison table to show that you understand tradeoffs rather than memorizing a single preferred service. |

Summary

Choose ALB when you need HTTP routing, TLS termination, host/path rules, target health checks, WebSockets, redirects, fixed responses, or routing to EC2/ECS/Lambda targets.

Longer Answer

For 'When should you choose ALB over alternatives?', interviewers are looking for a decision process: state the requirement, name the AWS mechanism, describe the limit or failure mode, and explain how you would verify it in production. For this question, mention the business and operational drivers: control, scaling shape, security boundaries, cost model, and how the service integrates with EC2, ECS, Lambda targets, ACM, WAF, Cognito/OIDC auth, CloudWatch, S3 access logs, Route 53, Global Accelerator, and CodeDeploy.

Use the comparison table to show that you understand tradeoffs rather than memorizing a single preferred service.

Key Points

• For 'When should you choose ALB over alternatives?', interviewers are looking for a decision process: state the requirement, name the AWS mechanism, describe the limit or failure mode, and explain how you would verify it in production
• For this question, mention the business and operational drivers: control, scaling shape, security boundaries, cost model, and how the service integrates with EC2, ECS, Lambda targets, ACM, WAF, Cognito/OIDC auth, CloudWatch, S3 access logs, Route 53, Global Accelerator, and CodeDeploy
• Use the comparison table to show that you understand tradeoffs rather than memorizing a single preferred service
• Use the answer to connect the concept back to a realistic production or interview scenario for 'When should you choose ALB over alternatives?'

Comparison / Tradeoffs