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

Which of the following are characteristics of Amazon VPC subnets? (Choose two.)
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 I
E . By default, all subnets can route between each other, whether they are private or public
F . V Each subnet spans at least 2 Availability zones to provide a high-availability environment

Answer: AD

Explanation:

“Each subnet must reside entirely within one Availability Zone and cannot span zones.” “Every subnet that you create is automatically associated with the main route table for the VPC.”

Reference: http://docs.aws.amazon.com/AmazonVPC/latest/UserGuide/VPC_Subnets.html

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