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VPC and Subnet

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Understanding VPC and Subnets

Amazon Virtual Private Cloud (VPC) is a significant part of Amazon Web Services (AWS), which provides a user-defined cloud network. VPC allows the user to create a logically isolated section of the AWS Cloud where the user can launch AWS resources in a virtual network. Subnets are a part of VPC, which is used to partition the VPC IP address range and segregate the resources launched in different subnets.

VPC

VPC provides a secure and scalable cloud network that can be customized by the user. The user can define their IP address range, create subnets, and configure route tables, network gateways, and security settings. With VPC, the user can launch resources such as EC2 instances, RDS databases, and Elastic Load Balancers (ELB) in a virtual network. VPC allows the user to extend an on-premises network to the cloud by using a virtual private network (VPN) connection or AWS Direct Connect. VPC provides a secure and isolated environment for the user’s resources.

Subnets

Subnets are a part of VPC, which is used to partition the VPC IP address range and segregate the resources launched in different subnets. Each subnet maps to a unique Availability Zone (AZ) in the AWS region, which provides the user with high availability and fault tolerance. The user can launch resources in different subnets, and each subnet can have its routing table and network access control list (NACL) to control the inbound and outbound traffic. The user can create public or private subnets and launch resources accordingly. Public subnets are directly connected to the internet, and resources launched in public subnets can be accessed from the internet. Private subnets are not connected to the internet, and resources launched in private subnets can only be accessed from within the VPC or through a VPN connection.

Security

VPC provides a secure and isolated environment for the user’s resources. The user can configure the security settings for the VPC, subnets, and resources launched in the VPC. The user can use security groups to control the inbound and outbound traffic at the instance level. Security groups act as a firewall for the instances and can be configured to allow or deny traffic based on IP addresses, ports, and protocols. NACL can also be used to control the inbound and outbound traffic at the subnet level. NACL operates at the subnet level and can be used to allow or deny traffic based on IP addresses, ports, and protocols.

Conclusion

VPC and subnets are essential components of AWS, which provide a secure and scalable cloud network for the user’s resources. VPC allows the user to create a logically isolated section of the AWS Cloud where the user can launch AWS resources in a virtual network. Subnets are used to partition the VPC IP address range and segregate the resources launched in different subnets. VPC and subnets provide the user with high availability, fault tolerance, and security for their resources.

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