| Network ACL | Security Group |
|---|---|
| At subnet level | At instance level |
| First level for ingress | 1st level for egress |
| This can have both allow and deny rules | This can have only allow rules |
| Ordered rules ( processed in a order) | not ordered |
| default - allow all and deny all in that order | default deny all in bound, allow all outbound |
| stateless(rule should be applied both ingress & egrees) | stateful (applied automatically) |
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