AWS Technical Essentials Practice Exam 2025 – Complete Preparation Guide

The service that allows instances in a private subnet to connect to other AWS services and the Internet is Network Address Translation (NAT). NAT acts as a gateway that enables instances in a private subnet to initiate outbound Internet traffic while preventing unsolicited inbound traffic from reaching those instances. This is particularly important for maintaining the security of the resources within the private subnet while still allowing them to access updates, web services, and other resources on the Internet.

When instances within a private subnet need to connect to services outside their subnet, they can route their traffic through a NAT gateway. The NAT gateway translates the private IP addresses of the instances into a public IP address, which is necessary for communication over the Internet. This allows those instances to reach AWS services such as S3, DynamoDB, and others securely.

Using NAT doesn't expose the private instances to the Internet directly but enables controlled connectivity, which is a critical requirement for many architectures that prioritize security while still needing access to external resources.

In contrast, networking services generally refer to a broad range of functionalities without a specific role in providing external connectivity for private subnets. Network attached storage is unrelated to networking traffic management and focuses on storage solutions, while private backend servers do not specifically define a method for enabling Internet connectivity for