VPC endpoints for private access in DynamoDB - Step-by-Step Execution

Concept Flow - VPC endpoints for private access

Start: Client in VPC

↓

Request DynamoDB Access

↓

Check VPC Endpoint Exists?

No→Request goes to Internet Gateway

Yes↓

Route Request via VPC Endpoint

↓

Access DynamoDB Privately

↓

Response Sent Back Privately

↓

End

This flow shows how a client inside a VPC accesses DynamoDB privately using a VPC endpoint, avoiding the public internet.

Execution Sample

DynamoDB

aws ec2 create-vpc-endpoint \
  --vpc-id vpc-123abc \
  --service-name com.amazonaws.us-east-1.dynamodb \
  --route-table-ids rtb-456def

This command creates a VPC endpoint for DynamoDB in a specified VPC and associates it with route tables.

Execution Table

Step	Action	Condition/Check	Result	Next Step
1	Client sends request to DynamoDB	Client is inside VPC	Request initiated	Check VPC endpoint existence
2	Check if VPC endpoint exists	VPC endpoint exists	Yes	Route request via VPC endpoint
3	Route request	Using VPC endpoint	Request routed privately	Access DynamoDB service
4	DynamoDB processes request	Request received via endpoint	Data accessed securely	Send response back
5	Response sent	Via VPC endpoint	Response received by client privately	End
6	If no VPC endpoint	Request goes to internet	Access denied or public route	End

💡 Execution stops after response is sent back privately or if no VPC endpoint exists, request goes via internet.

Variable Tracker

Variable	Start	After Step 2	After Step 3	After Step 5
Request Route	None	VPC Endpoint Exists	Routed via VPC Endpoint	Response received privately
Access Method	None	Private access enabled	Private access ongoing	Private access complete

Key Moments - 2 Insights

Why does the request not go through the internet when a VPC endpoint exists?

Because the VPC endpoint creates a private connection inside the AWS network, routing requests directly to DynamoDB without using the public internet, as shown in execution_table step 3.

What happens if the VPC endpoint is not created or associated properly?

The request will try to go through the internet gateway, which may be blocked or less secure, as shown in execution_table step 6.

Visual Quiz - 3 Questions

Look at the execution_table, at which step is the request routed privately via the VPC endpoint?

A Step 2

B Step 3

C Step 4

D Step 6

💡 Hint

Check the 'Result' column in execution_table row for Step 3.

According to variable_tracker, what is the 'Request Route' after Step 3?

A None

B Internet Gateway

C Routed via VPC Endpoint

D Blocked

💡 Hint

Look at the 'Request Route' row under 'After Step 3' in variable_tracker.

If the VPC endpoint does not exist, what is the likely outcome according to the execution_table?

A Request routed privately

B Access denied or public route

C Request sent to another AWS service

D Request automatically creates endpoint

💡 Hint

See the 'Condition/Check' and 'Result' columns in execution_table step 6.

Concept Snapshot

VPC endpoints allow private access to DynamoDB from inside a VPC.
They route requests within AWS network, avoiding the internet.
Create endpoints with AWS CLI or console, associating with route tables.
Requests use endpoint if it exists; otherwise, they go public.
This improves security and reduces latency.

Full Transcript

This visual execution shows how a client inside a VPC accesses DynamoDB privately using a VPC endpoint. The client sends a request, which checks if a VPC endpoint exists. If yes, the request routes privately through the endpoint to DynamoDB, and the response returns the same way. If no endpoint exists, the request tries to go through the internet, which may be blocked or less secure. Variables like 'Request Route' and 'Access Method' track the private routing state. Key moments clarify why private routing happens and what occurs if the endpoint is missing. The quiz tests understanding of routing steps and outcomes. Overall, VPC endpoints secure DynamoDB access inside AWS networks.