The differences between NACL and security groups have been discussed below:
|Network Access Control List that helps provide a layer of security to the amazon web services. There are two kinds of NACL- Customized and default.
|A security group has to be explicitly assigned to an instance; it doesn’t associate itself to a subnet.
|Multiple subnets can be bound with a single NACL, but one subnet can be bound with a single NACL only, at a time
|Security groups are associated with an instance of a service. It can be associated with one or more security groups which has been created by the user.
|NACL can be understood as the firewall or protection for the subnet.
|Security group can be understood as a firewall to protect EC2 instances.
|These are stateless, meaning any change applied to an incoming rule isn’t automatically applied to an outgoing rule.
|These are stateful, which means any changes which are applied to an incoming rule is automatically applied to a rule which is outgoing.
|Example: If a request comes through port 80, it should be explicitly indicated that its outgoing response would be the same port 80.
|Example: If the incoming port of a request is 80, the outgoing response of that request is also 80 (it is opened automatically) by default.
|NACL can be used to support as well as deny rules. Denial of rules can be explicitly mentioned, so that when the layer sees a specific IP address, it blocks connecting to it.
|They support rules only, and the default behaviour is denial of all rules.
Every VPC can belong to different security groups.
|It is considered to be the second layer of defence, which helps protect AWS stack. It is an optional layer for VPC, which adds another security layer to the amazon service.
|It is considered to be the first defence layer that helps protect the Amazon Web Services infrastructure.
|In case of NACL, the rules are applied in the order of their priority, wherein priority is indicated by the number the rule is assigned.
|In case of a security group, all the rules are applied to an instance.
|This means every rule is evaluated based on the priority it has.
|This means all rules are evaluated before they allow a traffic.
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