Discover which AWS services, including VPC Peering and AWS Transit Gateway, allow secure and scalable network connections between two VPCs. Essential for passing the AWS Certified Cloud Practitioner CLF-C02 exam.
Question
Which AWS services or features allow users to create a network connection between two VPCs? (Select TWO.)
A. VPC endpoints
B. Amazon Route 53
C. VPC peering
D. AWS Direct Connect
E. AWS Transit Gateway
Answer
C. VPC peering
E. AWS Transit Gateway
Explanation
VPC peering and AWS Transit Gateway are two AWS services or features that allow users to create a network connection between two VPCs.
When connecting two Virtual Private Clouds (VPCs) in AWS, the correct options are VPC Peering and AWS Transit Gateway. Here’s a detailed explanation of these services:
VPC Peering
VPC Peering establishes a direct networking connection between two VPCs, enabling them to communicate as if they are part of the same network. This is achieved using private IP addresses without traversing the public internet.
Key Features:
- Supports connections within the same AWS account, across different accounts, or even across regions (inter-region peering).
- Traffic remains private and secure within the AWS backbone.
- Simple to set up for one-to-one connections.
Limitations:
- It does not support transitive routing (i.e., VPC A cannot communicate with VPC C through VPC B).
- Managing multiple VPC peering connections can become complex at scale.
- Use Case: Ideal for direct communication between two VPCs when transitive routing is not required.
AWS Transit Gateway
AWS Transit Gateway acts as a central hub that connects multiple VPCs and on-premises networks. It is designed for scalability and simplifies large-scale network architectures.
Key Features:
- Supports transitive routing, allowing traffic between multiple connected VPCs.
- Centralized management of routing configurations.
- High availability and scalability by design.
- Can connect thousands of VPCs within a region or across regions using Transit Gateway peering.
Use Case: Best for managing complex multi-VPC environments or hybrid cloud architectures where transitive routing is required.
Incorrect Options
A. VPC Endpoints: These are used to privately connect your VPC to supported AWS services without traversing the public internet but do not connect two VPCs.
B. Amazon Route 53: A DNS web service used for domain name resolution, not for connecting networks.
D. AWS Direct Connect: Provides a dedicated physical connection between on-premises data centers and AWS but does not directly connect two VPCs9.
To create a network connection between two VPCs, you should use either VPC Peering for simple, one-to-one connections or AWS Transit Gateway for scalable, hub-and-spoke architectures that require transitive routing capabilities. These services are critical for building secure and efficient cloud networks on AWS.
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