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Amazon DOP-C02 Exam - Topic 4 Question 56 Discussion

Actual exam question for Amazon's DOP-C02 exam
Question #: 56
Topic #: 4
[All DOP-C02 Questions]

A company has an application that runs on Amazon EC2 instances behind an Application Load Balancer (ALB) The EC2 Instances are in multiple Availability Zones The application was misconfigured in a single Availability Zone, which caused a partial outage of the application.

A DevOps engineer made changes to ensure that the unhealthy EC2 instances in one Availability Zone do not affect the healthy EC2 instances in the other Availability Zones. The DevOps engineer needs to test the application's failover and shift where the ALB sends traffic During failover. the ALB must avoid sending traffic to the Availability Zone where the failure has occurred.

Which solution will meet these requirements?

Show Suggested Answer Hide Answer
Suggested Answer: B

* Turn off cross-zone load balancing on the ALB's target group:

Cross-zone load balancing distributes traffic evenly across all registered targets in all enabled Availability Zones. Turning this off will ensure that each target group only handles requests from its respective Availability Zone.

To disable cross-zone load balancing:

Go to the Amazon EC2 console.

Navigate to Load Balancers and select the ALB.

Choose the Target Groups tab, select the target group, and then select the Group details tab.

Click on Edit and turn off Cross-zone load balancing.

* Use Amazon Route 53 Application Recovery Controller to start a zonal shift away from the Availability Zone:

Amazon Route 53 Application Recovery Controller provides the ability to control traffic flow to ensure high availability and disaster recovery.

By using Route 53 Application Recovery Controller, you can perform a zonal shift to redirect traffic away from the unhealthy Availability Zone.

To start a zonal shift:

Configure Route 53 Application Recovery Controller by creating a cluster and control panel.

Create routing controls to manage traffic shifts between Availability Zones.

Use the routing control to shift traffic away from the affected Availability Zone.


Disabling cross-zone load balancing

Route 53 Application Recovery Controller

by Rikki at Nov 25, 2025, 06:39 PM

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Rueben
5 hours ago
I think B might actually work better since it focuses on the target group.
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Sophia
5 days ago
Option A seems like the best choice for zonal shifts.
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Laurena
11 days ago
I wonder if they'll get a bonus for fixing this so quickly. Kudos to them for staying on top of it!
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Carlee
16 days ago
Ah, the joys of distributed systems. Glad the DevOps engineer has a plan to handle this partial outage.
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Elenor
21 days ago
Option B looks good too, but I think C is the more straightforward solution. Gotta love those AWS services that make our lives easier.
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Dominque
26 days ago
Haha, I bet the DevOps engineer is regretting that misconfiguration. At least they're on top of it now!
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Olga
1 month ago
Option C seems like the right choice here. Using Route 53 ARC to shift traffic away from the problematic Availability Zone is a smart move.
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Dianne
1 month ago
I’m a bit confused about the difference between using the DNS hostname versus the ARN of the target group. I think I need to review that part again.
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Lawrence
1 month ago
I feel like option D might be the best choice since it involves a readiness check, but I’m not entirely confident about the specifics of the ElbV2TargetGroupsCanServeTraffic rule.
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Arletta
2 months ago
This question seems similar to one we practiced where we had to manage traffic during outages. I think using Route 53 for zonal shifts is key.
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Annelle
2 months ago
I remember studying about cross-zone load balancing, but I'm not sure if turning it off is the right approach here.
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Eura
2 months ago
This is a tough one, but I'm feeling pretty confident. I'll double-check the details, but I think option B is the way to go - turning off cross-zone load balancing on the target group and using the Application Recovery Controller.
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Reynalda
2 months ago
Okay, I think I've got it. The key is using the Amazon Route 53 Application Recovery Controller to shift traffic away from the failed Availability Zone. Option C looks like the best solution to meet the requirements.
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Avery
2 months ago
This question is tricky. I think option A makes sense.
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Layla
3 months ago
I feel like option D is the best. Readiness checks are crucial.
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Phil
3 months ago
I'm a bit confused by the details here. It's talking about the Application Load Balancer and Availability Zones, which I'm not super familiar with. I'll need to think this through step-by-step.
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Chauncey
3 months ago
This seems like a tricky question, but I think I have a good strategy. I'll carefully read through the options and try to identify the key requirements, like avoiding sending traffic to the failed Availability Zone.
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Barrett
2 months ago
I think option A makes sense. Turning off cross-zone load balancing could help.
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Lai
3 months ago
Option B is interesting too. It targets the ALB's group directly.
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