AWS Certified Advanced Networking – Specialty (ANS-C00) — Question 215

You have just configured an Elastic Load Balancer. Assuming all settings are configured properly, about how long will it take an instance to become healthy with a
6 second HealthCheck Interval, an unhealthy threshold of 5 and a healthy threshold of 10?

Answer options

• A. 120 seconds
• B. 30 seconds
• C. 6 seconds
• D. 60 seconds

Correct answer: D

Explanation

The correct answer is D because it takes 60 seconds for the instance to transition from unhealthy to healthy. This is calculated by the unhealthy threshold (5) multiplied by the health check interval (6 seconds) which totals 30 seconds. After that, the instance would need to pass 10 health checks, taking another 60 seconds (10 checks * 6 seconds). Thus, it takes a total of 60 seconds to become healthy after reaching the healthy threshold. Options A, B, and C do not correctly account for the number of health checks and the specified intervals.