A Network Access Control List (ACL) is a stateless network filtering mechanism provided by AWS for controlling traffic in and out of subnets within a VPC. Unlike security groups, which are stateful, network ACLs are stateless. This means that they do not automatically allow responses to inbound traffic unlessexplicitly specified. Network ACLs allow you to set rules for both inbound and outbound traffic, making them suitable for stateless filtering. Security groups, on the other hand, are stateful, while AWS WAF is primarily for web application-level security. AWS PrivateLink is used for privately connecting VPCs to AWS services without using an internet gateway. Therefore, for stateless network filtering, Network ACL is the correct choice.
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