AWS VPC Part 1 [ EC2 Instance, Security Group, Public Subnet, Elastic IP ]

Amazon Virtual Private Cloud (Amazon VPC) is a foundational AWS service that enables you to create a logically isolated network for your cloud resources. It allows you to define and control a virtual network closely resembling a traditional data center network, but with the scalability and flexibility of the AWS cloud.
Key Features of Amazon VPC:
Customizable Network Settings:
You can specify an IP address range for the VPC using CIDR notation (e.g., 10.0.0.0/16).
Divide the VPC into smaller subnets within different Availability Zones (AZs).
Subnets:
Public Subnets: Subnets with access to the internet, typically for web servers.
Private Subnets: Subnets without direct internet access, used for internal services like databases.
Route Tables:
Define how traffic is directed within the VPC and to external destinations.
Internet Gateway:
Enables internet access for resources in public subnets.
NAT Gateway or NAT Instances:
Allow resources in private subnets to access the internet without exposing them to inbound internet traffic.
Security Controls:
Security Groups: Act as virtual firewalls for EC2 instances, controlling inbound and outbound traffic.
Network ACLs (Access Control Lists): Provide an additional layer of subnet-level security.
Peering and Interconnectivity:
Connect VPCs (even across regions) using VPC Peering or AWS Transit Gateway.
Use VPN or AWS Direct Connect to integrate with on-premises networks.
Elastic IPs and Private IPs:
Allocate static public IPs for EC2 instances in public subnets.
Use private IPs for communication within the VPC.
Benefits of Amazon VPC:
Isolation: Complete network separation from other customers' networks.
Control: Full control over network configuration and routing.
Scalability: Automatically scales resources as demand grows.
Cost-Effectiveness: Only pay for what you use, without upfront hardware costs.
Integration: Seamlessly integrate with other AWS services like EC2, RDS, Lambda, and more.
Common Use Cases:
Host Web Applications: Deploy public-facing and private backend applications in a secure, scalable manner.
Hybrid Cloud Connectivity: Extend on-premises networks to the cloud using VPN or AWS Direct Connect.
Multi-Tier Applications: Separate application tiers (e.g., web, application, database) into different subnets for security.
Big Data Analytics: Run big data pipelines within an isolated and high-performance network.
With VPC, AWS provides the flexibility to design the network architecture according to your application's needs, ensuring both performance and security.
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