AWS Certified Advanced Networking – Specialty (ANS-C00) — Question 188

What are two reasons that could cause an HTTP health check to fail? (Choose two.)

Answer options

• A. Security group blocking port 80 to the instance
• B. HTTP server not running
• C. No Internet Gateway
• D. NACL blocking port 443 to the instance

Correct answer: A, B

Explanation

Option A is correct as a security group that blocks port 80 will prevent HTTP traffic, causing the health check to fail. Option B is also correct because if the HTTP server is not running, it cannot respond to health checks. Options C and D are incorrect because they do not directly impact the HTTP health check functionality for port 80.