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Question 44 - DEA-C01 discussion

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A company uses Amazon RDS to store transactional data. The company runs an RDS DB instance in a private subnet. A developer wrote an AWS Lambda function with default settings to insert, update, or delete data in the DB instance.

The developer needs to give the Lambda function the ability to connect to the DB instance privately without using the public internet.

Which combination of steps will meet this requirement with the LEAST operational overhead? (Choose two.)

A.

Turn on the public access setting for the DB instance.

Answers
A.

Turn on the public access setting for the DB instance.

B.

Update the security group of the DB instance to allow only Lambda function invocations on the database port.

Answers
B.

Update the security group of the DB instance to allow only Lambda function invocations on the database port.

C.

Configure the Lambda function to run in the same subnet that the DB instance uses.

Answers
C.

Configure the Lambda function to run in the same subnet that the DB instance uses.

D.

Attach the same security group to the Lambda function and the DB instance. Include a self-referencing rule that allows access through the database port.

Answers
D.

Attach the same security group to the Lambda function and the DB instance. Include a self-referencing rule that allows access through the database port.

E.

Update the network ACL of the private subnet to include a self-referencing rule that allows access through the database port.

Answers
E.

Update the network ACL of the private subnet to include a self-referencing rule that allows access through the database port.

Suggested answer: C, D

Explanation:

To enable the Lambda function to connect to the RDS DB instance privately without using the public internet, the best combination of steps is to configure the Lambda function to run in the same subnet that the DB instance uses, and attach the same security group to the Lambda function and the DB instance. This way, the Lambda function and the DB instance can communicate within the same private network, and the security group can allow traffic between them on the database port. This solution has the least operational overhead, as it does not require any changes to the public access setting, the network ACL, or the security group of the DB instance.

The other options are not optimal for the following reasons:

A . Turn on the public access setting for the DB instance. This option is not recommended, as it would expose the DB instance to the public internet, which can compromise the security and privacy of the data. Moreover, this option would not enable the Lambda function to connect to the DB instance privately, as it would still require the Lambda function to use the public internet to access the DB instance.

B . Update the security group of the DB instance to allow only Lambda function invocations on the database port. This option is not sufficient, as it would only modify the inbound rules of the security group of the DB instance, but not the outbound rules of the security group of the Lambda function. Moreover, this option would not enable the Lambda function to connect to the DB instance privately, as it would still require the Lambda function to use the public internet to access the DB instance.

E . Update the network ACL of the private subnet to include a self-referencing rule that allows access through the database port. This option is not necessary, as the network ACL of the private subnet already allows all traffic within the subnet by default. Moreover, this option would not enable the Lambda function to connect to the DB instance privately, as it would still require the Lambda function to use the public internet to access the DB instance.

1: Connecting to an Amazon RDS DB instance

2: Configuring a Lambda function to access resources in a VPC

3: Working with security groups

: Network ACLs

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asked 29/10/2024
Kyle Roarick
36 questions
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