- A
Use a horizontal pod autoscaler for the ingress controller.
Why wrong: HPA does not protect against node upgrades.
- B
Enable cluster autoscaler to add more nodes during the upgrade.
Why wrong: Autoscaler doesn't prevent ingress controller from being terminated.
- C
Use a managed node group with a higher instance count.
Why wrong: Managed node groups still get upgraded.
- D
Schedule the ingress controller pod on a dedicated node with a taint that prevents node upgrades.
Dedicated nodes can be excluded from upgrades, ensuring ingress availability.
Question 1,727 of 1,750
DOP-C02 Resilient Cloud Solutions Practice Question
This DOP-C02 practice question tests your understanding of resilient cloud solutions. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A company runs a containerized application on Amazon EKS. The application uses an ALB Ingress Controller. During a cluster upgrade, the ingress controller stops responding, causing downtime. The team wants to ensure resilience during upgrades. Which approach is BEST?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Schedule the ingress controller pod on a dedicated node with a taint that prevents node upgrades.
Option D is correct because applying a taint (e.g., `node-role.kubernetes.io/ingress:NoSchedule`) to a dedicated node and scheduling the ingress controller pod with a corresponding toleration ensures that the pod is not evicted during node upgrades. Managed node groups or cluster upgrades typically cordon and drain nodes, but a tainted node can be excluded from the upgrade process by setting `maxUnavailable: 0` or using a node group with `updateConfig` to skip that node. This prevents the ALB Ingress Controller from becoming unavailable during the cluster upgrade.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Use a horizontal pod autoscaler for the ingress controller.
Why it's wrong here
HPA does not protect against node upgrades.
- ✗
Enable cluster autoscaler to add more nodes during the upgrade.
Why it's wrong here
Autoscaler doesn't prevent ingress controller from being terminated.
- ✗
Use a managed node group with a higher instance count.
Why it's wrong here
Managed node groups still get upgraded.
- ✓
Schedule the ingress controller pod on a dedicated node with a taint that prevents node upgrades.
Why this is correct
Dedicated nodes can be excluded from upgrades, ensuring ingress availability.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse scaling mechanisms (HPA, cluster autoscaler) with pod scheduling guarantees, failing to realize that node upgrades cause pod eviction regardless of replica count or node count.
Detailed technical explanation
How to think about this question
Under the hood, EKS managed node groups use an `updateConfig` field that controls the maximum number of nodes that can be unavailable during an upgrade. By tainting a dedicated node with `node.kubernetes.io/unschedulable:NoSchedule` and setting `maxUnavailable: 0` on that node group, the upgrade process will skip that node entirely, keeping the ingress controller running. This is similar to using a `nodeSelector` with a custom label and a `toleration` for the `node.kubernetes.io/unschedulable` taint to pin critical workloads away from upgrade cycles.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Questions learners often ask
What does this DOP-C02 question test?
Resilient Cloud Solutions — This question tests Resilient Cloud Solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Schedule the ingress controller pod on a dedicated node with a taint that prevents node upgrades. — Option D is correct because applying a taint (e.g., `node-role.kubernetes.io/ingress:NoSchedule`) to a dedicated node and scheduling the ingress controller pod with a corresponding toleration ensures that the pod is not evicted during node upgrades. Managed node groups or cluster upgrades typically cordon and drain nodes, but a tainted node can be excluded from the upgrade process by setting `maxUnavailable: 0` or using a node group with `updateConfig` to skip that node. This prevents the ALB Ingress Controller from becoming unavailable during the cluster upgrade.
What should I do if I get this DOP-C02 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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