Amazon DOP-C02 Exam - Topic 4 Question 51 Discussion

Actual exam question for Amazon's DOP-C02 exam

Question #: 51
Topic #: 4

A company requires that its internally facing web application be highly available. The architecture is made up of one Amazon EC2 web server instance and one NAT instance that provides outbound internet access for updates and accessing public data.

Which combination of architecture adjustments should the company implement to achieve high availability? (Choose two.)

AAdd the NAT instance to an EC2 Auto Scaling group that spans multiple Availability Zones. Update the route tables.

BCreate additional EC2 instances spanning multiple Availability Zones. Add an Application Load Balancer to split the load between them.

CConfigure an Application Load Balancer in front of the EC2 instance. Configure Amazon CloudWatch alarms to recover the EC2 instance upon host failure.

DReplace the NAT instance with a NAT gateway in each Availability Zone. Update the route tables.

EReplace the NAT instance with a NAT gateway that spans multiple Availability Zones. Update the route tables.

Show Suggested Answer

Suggested Answer: B, D

https://docs.aws.amazon.com/vpc/latest/userguide/vpc-nat-gateway.html

by Nan at Jul 12, 2025, 05:48 AM

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Kattie

2 months ago

B is a must, can't rely on just one instance!

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Leota

2 months ago

I think A and C might work too.

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Stephen

3 months ago

Definitely B and D for high availability!

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Margo

3 months ago

Not sure about E, seems like overkill.

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Evangelina

3 months ago

Surprised that NAT gateways are even an option!

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Aja

3 months ago

I feel like option D makes sense because it talks about having a NAT gateway in each Availability Zone, but I’m not sure if that's the best approach compared to option E.

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Shawnna

3 months ago

I think replacing the NAT instance with a NAT gateway is crucial, but I can't recall if it should span multiple Availability Zones or just one.

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Willodean

4 months ago

I'm not entirely sure, but I feel like option C might be relevant since it mentions an Application Load Balancer, which we practiced in class.

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Buddy

4 months ago

I remember we discussed the importance of using multiple Availability Zones for high availability, so I think options A and B could be good choices.

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Dominque

4 months ago

Replacing the NAT instance with a multi-AZ NAT gateway seems like a good way to improve redundancy. I'll make sure to pair that with the web server changes.

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Keva

4 months ago

The CloudWatch alarm option sounds interesting, but I'm not sure if that's the best approach for high availability. I'll need to think that one through a bit more.

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Cecilia

4 months ago

Okay, I think I've got it. Adding the NAT instance to an Auto Scaling group and creating additional web servers with a load balancer should do the trick.

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Genevive

5 months ago

Hmm, I'm a bit unsure about the NAT instance. Should I focus more on making the web server highly available?

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Avery

5 months ago

This seems like a straightforward high availability question. I'll start by considering the options that involve redundancy across Availability Zones.

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Felix

6 months ago

Replacing the NAT instance with a NAT gateway that spans multiple Availability Zones could also improve availability.

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Anisha

6 months ago

Ah, the classic 'how to make your infrastructure more robust than a tank' question. B and E, obviously.

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Theodora

5 months ago

E) Replace the NAT instance with a NAT gateway that spans multiple Availability Zones. Update the route tables.

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Darci

5 months ago

B) Create additional EC2 instances spanning multiple Availability Zones. Add an Application Load Balancer to split the load between them.

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Niesha

6 months ago

That makes sense, spreading the load between multiple instances.

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Katina

7 months ago

I believe creating additional EC2 instances and adding an Application Load Balancer would also be a good idea.

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Jeniffer

7 months ago

I agree with Niesha. That would help with high availability.

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Goldie

7 months ago

This is a no-brainer, B and D all the way. I'd rather not have my web app go down like a lead balloon.

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Alaine

7 months ago

B and E. NAT gateway, the MVP of high availability. Who needs a NAT instance anyway?

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Mel

5 months ago

Configuring an Application Load Balancer in front of the EC2 instance and setting up CloudWatch alarms is crucial for recovering the instance upon failure.

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