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Virtual Private Cloud Quiz

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A company hosts a popular web application that connects to an Amazon RDS MySQL DB instance running in a private VPC subnet created with default ACL settings. The web servers must be accessible only to customers on an SSL connection and the database must only be accessible to web servers in a public subnet. Which solution meets these requirements without impacting other running applications?
Select 2 answers from the options given below.

A. Createa network ACL on the Web Server’s subnets, allow HTTPS port 443 inbound andspecify the source as 0.0.0.0/0

B. Createa Web Server security group that allows HTTPS port 443 inbound traffic from anywhere(0.0.0.0/0) and apply it to the Web Servers.

C. Createa DB Server security group that allows MySQL port 3306 inbound and specify thesource as the Web Server security group.

D. Createa network ACL on the DB subnet, allow MySQL port 3306 inbound for Web Serversand deny all outbound traffic.

B. & C.
This sort of setup is explained in the AWS documentation.

1) To ensure that traffic can flow into your web server from anywhere on secure traffic, you need to allow inbound security at 443.

2) And then, you need to ensure that traffic can flow from the database server to the web server via the database security group.

https://docs.aws.amazon.com/vpc/latest/userguide/VPC_Scenario2.html

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