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Amazon DOP-C02 Exam - Topic 4 Question 51 Discussion

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.)
B) Create additional EC2 instances spanning multiple Availability Zones. Add an Application Load Balancer to split the load between them. and D) Replace the NAT instance with a NAT gateway in each Availability Zone. Update the route tables.
A) Add the NAT instance to an EC2 Auto Scaling group that spans multiple Availability Zones. Update the route tables.
C) Configure an Application Load Balancer in front of the EC2 instance. Configure Amazon CloudWatch alarms to recover the EC2 instance upon host failure.
E) Replace the NAT instance with a NAT gateway that spans multiple Availability Zones. Update the route tables.

Amazon DOP-C02 Exam - Topic 4 Question 51 Discussion

Actual exam question for Amazon's DOP-C02 exam
Question #: 51
Topic #: 4
[All DOP-C02 Questions]

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.)

Show Suggested Answer Hide 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
8 months ago
B is a must, can't rely on just one instance!
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Leota
9 months ago
I think A and C might work too.
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Stephen
9 months ago
Definitely B and D for high availability!
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Margo
9 months ago
Not sure about E, seems like overkill.
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Evangelina
9 months ago
Surprised that NAT gateways are even an option!
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Aja
9 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
10 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
10 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
10 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
10 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
10 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
11 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
11 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
11 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
1 year ago
Replacing the NAT instance with a NAT gateway that spans multiple Availability Zones could also improve availability.
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Anisha
1 year ago
Ah, the classic 'how to make your infrastructure more robust than a tank' question. B and E, obviously.
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Theodora
12 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
12 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
1 year ago
That makes sense, spreading the load between multiple instances.
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Katina
1 year ago
I believe creating additional EC2 instances and adding an Application Load Balancer would also be a good idea.
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Jeniffer
1 year ago
I agree with Niesha. That would help with high availability.
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Goldie
1 year 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
1 year ago
B and E. NAT gateway, the MVP of high availability. Who needs a NAT instance anyway?
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Mel
12 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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Eulah
1 year ago
Having additional EC2 instances spanning multiple Availability Zones with an Application Load Balancer is a great way to split the load.
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Lawrence
1 year ago
Adding the NAT instance to an EC2 Auto Scaling group that spans multiple Availability Zones is also important for high availability.
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Virgina
1 year ago
I agree, using a NAT gateway that spans multiple Availability Zones is definitely a good choice.
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Dylan
1 year ago
Hmm, C and D. Recover the EC2 instance? Sounds like a party trick I gotta see!
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Alonzo
1 year ago
I was thinking B and E. Gotta love that multi-AZ NAT gateway action!
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Jamie
1 year ago
User 1: I think B and E are the way to go.
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Ahmed
1 year ago
B and D for sure. Can't have a single point of failure for that NAT instance!
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Glenna
1 year ago
Agreed, having multiple EC2 instances across Availability Zones and using NAT gateways will definitely improve our high availability.
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Ressie
1 year ago
B and D are definitely the way to go. We need to spread the load and eliminate that single point of failure.
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Niesha
1 year ago
I think we should add the NAT instance to an EC2 Auto Scaling group and update the route tables.
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