Network ACL

Description

Network Access Control Lists (ACLs) are an essential component of AWS. They provide a way to secure network traffic by allowing the customer to specify which traffic is allowed on their AWS cloud instances, and which should be blocked. Through the use of rules and conditions, ACLs provide granular control over inbound and outbound traffic. Network ACLs are stateless; they do not manage connections or sessions but rather act as a packet filter. They are applied at the subnet level, allowing customers to create different sets of rules for different parts of their network. Network ACLs can be used in conjunction with security groups for extra protection against malicious activity or unauthorised access.

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Network ACL
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EC2 Subnet
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.
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EC2 Subnet

VPC
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.
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VPC

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