Question

Two Auto Scaling applications, Application A and Application B, currently run within a shared set of subnets. A Solutions Architect wants to make sure that Application A can make requests to Application B, but Application B should be denied from making requests to Application A. Which is the SIMPLEST solution to achieve this policy

Answer 1

Answer:

Using Network Access Control Lists (ACL) to allow/deny traffic based on application IP addresses

Explanation:

ALL Network Access Control List has has distinct inbound and outbound rules.

Each of these rules are configured to either allow or deny traffic.

This is the best and easiest way to achieve the task at hand.

The Network ACL will be configured to allow inbound and outbound traffic for Application A to send and receive requests and only inbound traffic will be allowed for Application B to receive requests only from A