Exam AWS Certified SysOps Administrator - Associate topic 1 question 196 discussion

Option A (Create a new security group to block traffic to the external IP address and assign it to the EC2 instance) is incorrect because security groups control inbound and outbound traffic to and from an EC2 instance, but they cannot be used to block traffic to external IP addresses. They only allow you to specify allowed traffic based on ports and protocols. Option B (Use VPC flow logs with Amazon Athena to block traffic to the external IP address) is incorrect because VPC flow logs do not have the capability to block traffic. They are used for monitoring and logging network traffic, but they cannot be used for active traffic control. Option D (Create a new security group to block traffic to the external IP address and assign it to the entire VPC) is incorrect because, like in Option A, security groups are not meant to block traffic to specific external IP addresses. Assigning the security group to the entire VPC will not achieve the goal of blocking traffic to the specific IP address identified by GuardDuty.