Oracle Cloud Infrastructure 2021 Architect Associate — Question 13

You created a virtual cloud network (VCN) with three private subnets. Two of the subnets contain application servers and the third subnet contains a DB System. The application requires a shared file system so you have provisioned one using the file storage service (FSS).
You also created the corresponding mount target in one of the application subnets. The VCN security lists are properly configured so that both application servers and the DB system can access the file system. The security team determines that the DB System should have read-only access to the file system.
What change should you make to satisfy this requirement?

Answer options

• A. Create an NFS export option that allows READ_ONLY access where the source is the CIDR range of the DB System subnet.
• B. Create an instance principal for the DB System. Write an Identity and Access Management (IAM) policy that allows the instance principal read-only access to the file storage service.
• C. Modify the security list associated with the subnet where the mount target resides. Change the ingress rules corresponding to the DB System subnet to be stateless.
• D. Connect via SSH to one of the application servers where the file system has been mounted. Use the Unix command chmod to change permissions on the file system directory, allowing the database user read only access.

Correct answer: A

Explanation

The correct answer is A because creating an NFS export option with READ_ONLY access specifically for the DB System subnet ensures that the database can only read from the file system, fulfilling the security requirement. Option B is incorrect as it discusses IAM policies, which are not applicable for controlling NFS access. Option C does not directly address the read-only requirement for the DB System. Option D is wrong because changing permissions via chmod does not guarantee that access controls are aligned with the security team's restriction of read-only access.