ANS-C01 Network Security, Compliance and Governance Practice Question

Correct answer & explanation

The Service Control Policy (SCP). SCPs are used in AWS Organizations to centrally control the maximum available permissions for all accounts in an organization. They can be used to prevent security groups from allowing inbound SSH from 0.0.0.0/0 by denying the ability to create or modify security group rules that permit such traffic. Network ACLs (Option A) operate at the subnet level and are not account-wide; they control traffic entering/exiting subnets, but cannot enforce organizational policies across multiple accounts. IAM policies (Option B) apply to users, groups, or roles, and cannot directly restrict security group configurations. AWS Config rules (Option D) are detective controls that can evaluate compliance but are not preventive; they do not block the creation of non-compliant security group rules. Therefore, SCP is the appropriate preventive policy type.