Network ACL

The link between ec2-network-acl and ec2-subnet in Amazon Web Services (AWS) lies in their ability to work together to provide secure access control. In AWS, an EC2 Network ACL is a virtual firewall that acts as an additional layer of security for the EC2 subnets it is associated with. It provides control over both inbound and outbound traffic at the subnet level, allowing administrators to specify which protocols, ports, and IP addresses are allowed or denied access. The network ACLs also make it possible to prioritize the order of rules applied on a per-subnet basis for more granular control. By pairing EC2 Network ACLs with EC2 Subnets, administrators can ensure that only authorized users are able to access resources within their AWS environment.

The relationship between Amazon EC2 Network ACLs (NACLs) and VPCs is an important one. NACLs are associated with a single VPC and act as a firewall for controlling inbound and outbound traffic at the subnet level. They provide an additional layer of security for instances in the VPC by allowing you to specify which traffic is allowed to reach the instances. NACLs allow you to set rules that control ingress and egress network traffic from your subnets, including port numbers, IP addresses, or protocol types. You can also define separate rules to allow or deny specific traffic within a given port range. In addition, it is possible to assign multiple NACLs to individual subnets within a single VPC; however, only one of them can be active at any given time. Lastly, when creating new resources within AWS such as EC2 instances or ELB load balancers, it is important to ensure that the associated NACL allows access from those resources.