Oracle Cloud Infrastructure 2019 Developer Associate — Question 95

You are the Solutions Architect of a large company and are tasked with migrating all your services to Oracle Cloud Infrastructure. As part of this, you first design a
Virtual Cloud Network (VCN) with a public subnet and a private subnet. Then in order to provide Internet connectivity to the instances in your private subnet, you create an Oracle Linux instance in your public subnet and configure NAT on it. However, even after adding all related security list rules and routes in the Route
Table, your private subnet instances still cannot connect to the Internet.
Which action should you perform to enable Internet connectivity?

Answer options

• A. Disable "Source and Destination Check" on the VNIC of your Linux instance.
• B. There is no way that a private subnet can connect to the Internet.
• C. Create a Dynamic Routing Gateway (DRG) and route your private IP traffic to the DRG.
• D. Restart the NAT instance.

Correct answer: A

Explanation

The correct choice is A because disabling 'Source and Destination Check' on the VNIC of the Linux instance allows it to function as a NAT device properly. Option B is incorrect since private subnets can connect to the Internet through a NAT instance. Option C is not necessary for this scenario, as the NAT instance alone can handle Internet traffic. Option D is unlikely to resolve the issue if the configuration settings are not correct.