We can define multiple inbound and outbound rules in an NACL. An NACL can be associated with one or multiple subnets in the VPC. An inbound rule allows or blocks incoming network requests from outside of the subnet to the resources hosted in the subnet. An outbound rule allows or blocks network requests from resources hosted within the subnet to outside of the subnet. Each rule has a number. The rules are evaluated from the rule with the lowest number first and then the rule with the next highest number. However, if a rule allows particular network traffic, other rules are not evaluated. So if a rule with the lowest number allows all traffic, more restrictive rule that would have blocked the traffic will not take effect. An ...
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