Learn how to identify a public subnet in AWS.
Table of Contents
Question
What is the defining characteristic of a public subnet?
A. It has a route to an Internet Gateway
B. It automatically assigns public IP addresses
C. It has an Network ACL that allows all inbound traffic
D. It has a route to a NAT gateway
Answer
A. It has a route to an Internet Gateway
Explanation
The correct answer is A. It has a route to an Internet Gateway. A public subnet is a subnet that has direct access to the Internet. This is achieved by attaching an Internet Gateway to the VPC and adding a default route to the subnet’s route table that points to the Internet Gateway. The other options are not necessary or sufficient to make a subnet public.
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