AWS Certified SysOps Administrator – Associate (legacy) — Question 628

Network ACLs are _______.

Answer options

• A. stateful
• B. stateless
• C. asynchronous
• D. synchronous

Correct answer: B

Explanation

Network Access Control Lists (NACLs) operate as stateless firewalls, meaning they do not remember the state of a connection and require separate rules to be explicitly configured for both inbound and outbound traffic. In contrast, security groups are stateful because they automatically allow return traffic for any established connection. Synchronous and asynchronous are terms that describe communication timing and do not apply to ACL filtering behavior.