AWS Certified SysOps Administrator – Associate (legacy) — Question 210

Which of the following are characteristics of Amazon VPC subnets? (Choose two.)

Answer options

• A. Each subnet maps to a single Availability Zone
• B. A CIDR block mask of /25 is the smallest range supported
• C. Instances in a private subnet can communicate with the internet only if they have an Elastic IP.
• D. By default, all subnets can route between each other, whether they are private or public
• E. V Each subnet spans at least 2 Availability zones to provide a high-availability environment

Correct answer: A, D

Explanation

Option A is correct because each subnet is indeed associated with a single Availability Zone. Option D is also correct as, by default, subnets can route traffic between themselves. Options B, C, and E are incorrect because a /25 CIDR block is not the smallest range supported, instances in a private subnet typically cannot communicate with the internet without a NAT gateway, and subnets do not span multiple Availability Zones.