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Subnet Groups

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Subnet Groups are collections of subnets that reside within an Amazon Virtual Private Cloud (VPC). They are used to simplify the process of deploying ElastiCache clusters within a VPC. Subnets within a group will be distributed among multiple Availability Zones (AZ) to ensure high availability and …

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AWS Certified Solutions Architect - Subnet Groups Example Questions

Test your knowledge of Subnet Groups

Question 1

In AWS, you are designing a production workload in a single VPC that requires three subnets. You must tolerate the loss of any one Availability Zone without service interruption and keep inter-subnet latency low by staying within a single region. Which subnet placement best meets these requirements?

Correct Answer: 3 subnets in different Availability Zones within the same region

Placing each of the three subnets in a different Availability Zone within the same AWS region provides fault isolation and rapid failover if an AZ becomes unavailable, while maintaining low, predictable latency because all traffic remains within a single region’s backbone. Keeping all subnets in one AZ creates a single point of failure. Spreading subnets across different regions introduces significantly higher latency and complexity, and in AWS a VPC is regional—its subnets cannot span multiple regions. Using two subnets in one AZ and one in another is less resilient than distributing one subnet per AZ, as it concentrates risk and reduces the ability to evenly fail over.

Question 2

You are designing a highly sensitive application that needs to maintain a secure network environment. Which method should you use to create subnet groups to ensure the highest level of security?

Correct Answer: Use dedicated tenancy with individual VPCs for each subnet group

Higher levels of security can be achieved by utilizing dedicated tenancy with individual VPCs for each subnet group. This ensures that each subnet group is completely isolated, ensuring no other tenants or users have access to your subnet groups.

Question 3

Your application includes a database that utilizes Amazon RDS. You are required to place the database in a subnet group for high availability. How should the subnet group be configured?

Correct Answer: Create a subnet group with multiple subnets in different Availability Zones

RDS uses subnet groups for high availability by creating a primary database instance in one Availability Zone and a standby instance in another. This requires a subnet group with multiple subnets in different Availability Zones to allow for automatic failover in case of an outage.

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