Learn the essential steps to create a highly available Virtual Private Cloud (VPC) on AWS. Discover the optimal subnet placement strategy across Availability Zones to ensure maximum resilience and fault tolerance for your cloud infrastructure.
Table of Contents
Question
Which statement is true about building a highly available VPC?
A. Place more than one subnet in at least two Availability Zones.
B. Place multiple subnets in the same Availability Zone.
C. Attach two internet gateways to your VPC.
D. Place more than one subnet in at least two Regions.
Answer
A. Place more than one subnet in at least two Availability Zones.
Explanation
To build a highly available architecture in a VPC, you should place your subnets in multiple Availability Zones. The purpose for this arrangement is if one Availability Zone fails, your instances in the subnets in the other Availability Zones will still be available.
The correct statement about building a highly available VPC is to place more than one subnet in at least two Availability Zones.
In AWS, an Availability Zone (AZ) is a distinct location within a Region that is engineered to be isolated from failures in other AZs. Each AZ consists of one or more discrete data centers equipped with independent power, cooling, and networking infrastructure. By placing subnets in multiple AZs, you can ensure that your VPC remains highly available even if one AZ experiences an outage or failure.
Here’s why the other options are incorrect:
B. Place multiple subnets in the same Availability Zone.
Placing multiple subnets in the same AZ does not provide high availability. If that particular AZ experiences an issue, all subnets within it will be affected, potentially rendering your VPC inaccessible.
C. Attach two internet gateways to your VPC.
Attaching multiple internet gateways to a VPC is not possible. Each VPC can have only one internet gateway attached to it. Moreover, having multiple internet gateways does not contribute to high availability.
D. Place more than one subnet in at least two Regions.
While placing subnets in multiple Regions can provide geo-redundancy, it is not the primary focus of building a highly available VPC. Regions are geographically separate areas, and deploying across multiple Regions is typically done for global presence and disaster recovery purposes.
To summarize, the key to building a highly available VPC is to distribute your subnets across multiple Availability Zones within a Region. This ensures that if one AZ faces issues, your applications and services can continue running in the other AZs, minimizing downtime and maintaining high availability.
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