A VPC Endpoint is a network component that enables private connectivity between AWS resources in a VPC and supported AWS services, without requiring public IP addresses or traffic to traverse the public internet.
When to Use a VPC Endpoint
Use VPC Endpoints when security and privacy are priorities, as it allows your resources in private subnets to access AWS services (like S3, DynamoDB, or other supported services) without exposure to the internet.
VPC Endpoints can improve performance, reduce latency, and simplify network architecture by removing dependencies on NAT gateways or internet gateways.
They help in scenarios where compliance or regulatory requirements dictate that traffic must remain entirely within the AWS network backbone.
Use them to save on NAT gateway or data transfer costs when large amounts of traffic are sent to or from AWS services.
When Not to Use a VPC Endpoint
They may not be suitable if you require internet access for your workloads (e.g., accessing third-party services).
If your use case does not require private connectivity and your infrastructure already relies on internet/NAT gateways, VPC Endpoints could add unnecessary complexity.
There is an additional cost for interface endpoints, charged per hour and data transferred, which may be a consideration for cost-sensitive environments.
Service support is not universal—gateway endpoints only work for S3 and DynamoDB, and not all AWS services support PrivateLink/interface endpoints.
Alternatives to VPC Endpoints
NAT Gateway or NAT Instance: Provides private subnets with internet access, but all traffic goes over the public internet and incurs NAT gateway/data transfer costs.
VPN Connection or AWS Direct Connect: Used for private connectivity between on-premises networks and AWS VPCs. These are more suitable for hybrid cloud requirements and broader connectivity scenarios.
Internet Gateway: Needed if your resources require general internet access, though this exposes them to the public internet.
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