Question 260
A team faces the following situation: A team wants an instance-level virtual firewall that permits application traffic on selected ports. Which AWS approach best fits?
Explanation
Correct Answer
Attach appropriately scoped security groups to the protected resources. This directly addresses the question rather than a different AWS use case. Security groups control permitted traffic at supported AWS resources and are stateful. Recognize the requirement: Look for instance network interfaces and the need for allow-list rules. At a high level, attach appropriately scoped security groups to the protected resources. The intended outcome is: Allowed application requests reach the instance while unapproved traffic is blocked. Keep in mind: Security groups allow rules but do not serve as a web application firewall.
Incorrect Answers
Amazon VPC provides logically isolated networking with subnet and routing configuration. That addresses a different mechanism; this question turns on Attach appropriately scoped security groups to the protected resources.
Amazon Route 53 provides DNS and related routing functions. It does not establish Attach appropriately scoped security groups to the protected resources; the scenario instead depends on Attach appropriately scoped security groups to the protected resources.
Network ACLs provide stateless traffic filtering at the subnet boundary. That observation may hold without resolving the relevant issue: Attach appropriately scoped security groups to the protected resources.