Network ACLs provide an additional layer of security for your VPC (Virtual Private Cloud) by allowing you to control traffic flow at the subnet level. By default, all inbound and outbound traffic is blocked until you define rules to permit specific traffic based on the desired requirements of your network architecture.
D - https://docs.aws.amazon.com/vpc/latest/userguide/vpc-network-acls.html#custom-network-acl
Trick question, default VPC the NACL is permissive, but because it specifies " that you construct", the below applies -
You can create a custom network ACL and associate it with a subnet. By default, each custom network ACL denies all inbound and outbound traffic until you add rules.
By default, it allows all inbound and outbound IPv4 traffic and, if applicable, IPv6 traffic.
By default, each custom network ACL denies all inbound and outbound traffic until you add rules.
So Answer is D
The answer is D. Check out https://docs.aws.amazon.com/vpc/latest/userguide/vpc-network-acls.html#nacl-basics. Quote "By default, each custom network ACL denies all inbound and outbound traffic until you add rules.".
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