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Virtual Private Cloud Quiz

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There is a requirement to host a database server. This server should not be able to connect to the Internet except while downloading required database patches. Which of the following solutions would best satisfy all the above requirements? Choose the correct answer from the options below.

A. Setup the database in a private subnet with a security group which only allowsoutbound traffic.

B. Setup the database in a public subnet with a security group which only allows inboundtraffic.

C. Setup the database in a local data center and use a private gateway to connect theapplication to the database.

D. Setup the database in a private subnet which connects to the Internet via a NAT Instance.

D. Setup the database in a private subnet which connects to the Internet via a NATInstance.
This setup coincides with Scenario 2 of setting up a VPC as per AWS documentation:Scenario 2: VPC with Public and Private Subnets (NAT)The configuration for this scenario includes a virtual private cloud (VPC) with a public subnet and a private subnet. We recommend this scenario if you want to run a public-facing web application, while maintaining back-end servers that aren’t publicly accessible. A common example is a multi-tier website, with the web servers in a public subnet and the database servers in a private subnet. You can set up security and routing so that the web servers can communicate with the database servers.
For more information on the VPC Scenario for public and private subnets, please see the below link:
http://docs.aws.amazon.com/AmazonVPC/latest/UserGuide/VPC_Scenario2.html

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