Answer-first summary for fast verification
Answer: Security Groups
Overall explanation Correct option: Security Groups A security group acts as a virtual firewall for your EC2 instances to control incoming and outgoing traffic. Inbound rules control the incoming traffic to your instance, and outbound rules control the outgoing traffic from your instance. Check the security group rules of your EC2 instance. You need a security group rule that allows inbound traffic from your public IPv4 address on the proper port. Incorrect options: IAM Roles - Usually you run into issues with authorization of APIs with roles but not for timeout, so this option does not fit the given use-case. The application is down - Although you can set a health check for application ping or HTTP, timeouts are usually caused by blocked firewall access. The ALB is warming up - ALB has a slow start mode which allows a warm-up period before being able to respond to requests with optimal performance. So this is not the issue.
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As an AWS Certified Developer Associate, you are tasked with managing an application running across multiple Amazon EC2 instances. These instances are fronted by an Internet-facing load balancer which handles incoming client requests from the internet and distributes them to the EC2 instances. Additionally, the load balancer has a health check configured to ping the index.html page located in the root directory of each instance to determine their health status. Recently, visitors accessing the website over the internet have been experiencing timeout errors.
What should be checked first to resolve the issue?
A
Security Groups
B
IAM Roles
C
The application is down
D
The ALB is warming up
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