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What is the key difference between a security group and a network ACL?

  1. A Security groups are stateful and allow-only; NACLs are stateless and support deny rules
  2. B NACLs are stateful
  3. C Security groups operate at subnet level
  4. D They are identical
Answer

Security groups are stateful and allow-only; NACLs are stateless and support deny rules

Because NACLs are stateless, return traffic including ephemeral ports must be explicitly allowed, which is a common source of confusion.

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