Exam AWS Certified Security - Specialty SCS-C02 All Questions

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Exam AWS Certified Security - Specialty SCS-C02 topic 1 question 17 discussion

Exam question from Amazon's AWS Certified Security - Specialty SCS-C02

Question #: 17
Topic #: 1

[All AWS Certified Security - Specialty SCS-C02 Questions]

A security engineer is working with a company to design an ecommerce application. The application will run on Amazon EC2 instances that run in an Auto Scaling group behind an Application Load Balancer (ALB). The application will use an Amazon RDS DB instance for its database.
The only required connectivity from the internet is for HTTP and HTTPS traffic to the application. The application must communicate with an external payment provider that allows traffic only from a preconfigured allow list of IP addresses. The company must ensure that communications with the external payment provider are not interrupted as the environment scales.
Which combination of actions should the security engineer recommend to meet these requirements? (Choose three.)

A. Deploy a NAT gateway in each private subnet for every Availability Zone that is in use.
B. Place the DB instance in a public subnet.
C. Place the DB instance in a private subnet.
D. Configure the Auto Scaling group to place the EC2 instances in a public subnet.
E. Configure the Auto Scaling group to place the EC2 instances in a private subnet.
F. Deploy the ALB in a private subnet.

Show Suggested Answer

Suggested Answer: ACE 🗳️

by aragon_saa at Oct. 3, 2023, 8:20 a.m.

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Comments

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Ptol

Highly Voted 1 year, 1 month ago

Selected Answer: CE

This cannot possibly be an exam question. its poorly worded. None of the partial answers address the need to contol the outgoing connections IP addresses. If A placed the NAT in a public subnet with an elastic IP address attached, then we would have a valid solution

upvoted 8 times

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1329ca5

Most Recent 1 month, 3 weeks ago

Selected Answer: ACE

Based on best practices for security, scalability, and meeting the specific requirements: C. Place the DB instance in a private subnet. (Essential for database security) E. Configure the Auto Scaling group to place the EC2 instances in a private subnet. (Essential for application server security behind an ALB) A. Deploy a NAT gateway in each private subnet for every Availability Zone that is in use. (Essential for EC2 instances in private subnets to reach the external payment provider with a static, highly available outbound IP, supporting ASG scaling)

upvoted 1 times

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Kaps443

4 months, 1 week ago

Selected Answer: ACE

A. Deploy a NAT gateway in each private subnet for every Availability Zone that is in use. ✔️ Ensures EC2s in private subnets can access the internet using static Elastic IPs via NAT — which are pre-approved by the payment provider. C. Place the DB instance in a private subnet. ✔️ Best practice: RDS should never be in a public subnet. Keeps DB isolated and secure. E. Configure the Auto Scaling group to place the EC2 instances in a private subnet. ✔️ EC2s in private subnets use the NAT Gateway to talk to the internet, keeping them protected from direct public access. The ALB handles public traffic.

upvoted 1 times

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phmeeeee

4 months, 1 week ago

Selected Answer: CE

NAT GW in private subnet is useless!,

upvoted 2 times

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Artemiy

4 months, 2 weeks ago

Selected Answer: CE

only two are valid A can't be possible because nat gateway must be in public subnet

upvoted 1 times

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molerowan

5 months, 1 week ago

Selected Answer: CE

C&E is the only legit answer A and F are a terrible idea.

upvoted 1 times

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diegomarin

8 months ago

Selected Answer: ACD

Nat GW em rede privada não tem saída para usar o EIP.

upvoted 2 times

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bukkanni

11 months, 3 weeks ago

NAT Gateway in a private subnet. Seriously? How will EC2 instances in a private subnet get internet access if the NAT Gateway is in a private subnet and itself does not have internet access. Am I missing something?

upvoted 3 times

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FunkyFresco

12 months ago

Selected Answer: ACE

ACE are correct.

upvoted 1 times

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sema2232

1 year, 2 months ago

B,E,F are correct

upvoted 1 times

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shailvardhan

1 year, 2 months ago

Incorrect options as question is not clear enough.

upvoted 1 times

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Raphaello

1 year, 8 months ago

Keyword: " preconfigured allow list of IP addresses" However, the question missed an important detail alongside these keywords..that the communication has to be routed to a VPN and through a virtual private gateway (VGW). That's the only reason you can place NAT GW in a private subnet. Without that piece of detail, placing NAT GW seems unreasonable. Poorly written question, but if you considered that, A C E would make sense. https://docs.aws.amazon.com/vpc/latest/userguide/nat-gateway-scenarios.html#private-nat-allowed-range

upvoted 4 times

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Daniel76

1 year, 9 months ago

Selected Answer: ACE

C and E are definitely correct. A is confusing because NAT gateway should be created in public subnets. It should be referring to created *for each private subnets instead. F is wrong because ALB should be in public subnet.

upvoted 2 times

confusedyeti69

1 year, 8 months ago

There is private NAT gateway as well, but I'm not sure if private NAT gateway is deployed to public or private subnet. https://docs.aws.amazon.com/vpc/latest/userguide/vpc-nat-gateway.html Private – Instances in private subnets can connect to other VPCs or your on-premises network through a private NAT gateway. You can route traffic from the NAT gateway through a transit gateway or a virtual private gateway. You cannot associate an elastic IP address with a private NAT gateway. You can attach an internet gateway to a VPC with a private NAT gateway, but if you route traffic from the private NAT gateway to the internet gateway, the internet gateway drops the traffic.

upvoted 1 times

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