This CKAD practice question tests your understanding of application deployment. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
You are responsible for deploying a critical application that must be highly available. The application consists of a single pod that should always be running on a node that has an SSD. You have two node pools: one with standard HDD and one with SSD. The application must be rescheduled immediately if the node fails. You create a Deployment with replicas: 1 and a nodeSelector for the SSD label. However, after a node failure, the pod is not rescheduled on another SSD node for several minutes. You check the Deployment and it shows the desired replica count is 1 but the current replica count is 0. What is the most likely reason for the delay?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Clue: "always"
Why it matters: Absolute qualifier. An answer using 'always' is only correct if there are genuinely no exceptions — absolute statements are often wrong in networking.
Clue: "immediately / without restart"
Why it matters: Time or reboot constraint — the correct answer must take effect right away without requiring a reboot or reload.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The pod is in Terminating state on the failed node and the ReplicaSet waits for it to be fully deleted
Option C is correct because when a node fails, the pod on that node enters the Terminating state (as the kubelet is unreachable to confirm deletion). The ReplicaSet controller waits for the pod to be fully deleted before creating a replacement, due to the default terminationGracePeriodSeconds (30s) plus the node failure detection time (up to node-monitor-grace-period, default 40s). This delay is compounded by the pod's status not being updated until the node controller marks the node as unreachable, causing the ReplicaSet to not immediately create a new pod.
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.
✗
The Deployment's progressDeadlineSeconds is set too high
Why it's wrong here
progressDeadlineSeconds is for rollout progress, not pod rescheduling.
✗
The application's readiness probe is failing on the new node
Why it's wrong here
Readiness probe would cause pod not ready, but not delay creation.
✓
The pod is in Terminating state on the failed node and the ReplicaSet waits for it to be fully deleted
Why this is correct
Until the pod is confirmed deleted, ReplicaSet may not create a replacement immediately.
Clue confirmation
The clue words "most likely", "always", "immediately / without restart" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The nodeSelector is preventing the pod from being scheduled on available SSD nodes
Why it's wrong here
NodeSelector would cause pending, but the delay is due to termination.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume a Deployment with replicas: 1 will immediately create a new pod upon node failure, but they overlook the pod's Terminating state and the ReplicaSet's dependency on pod deletion before creating a replacement, which is a common source of delay in real-world scenarios.
Detailed technical explanation
How to think about this question
Under the hood, when a node fails, the kube-controller-manager's node controller sets the node's status to Unknown after node-monitor-grace-period (default 40s), then the pod's status transitions to Terminating. The ReplicaSet controller uses the pod's deletionTimestamp to decide if a replacement is needed; it will not create a new pod until the old pod is fully removed from the API server, which requires the node controller to force-delete the pod after node-eviction-timeout (default 5m). This behavior is governed by the Kubernetes garbage collection and pod lifecycle, where the ReplicaSet ensures at-most-one semantics for stateful workloads, but for stateless deployments, this delay can be mitigated by setting a short terminationGracePeriodSeconds or using a StatefulSet with podManagementPolicy: Parallel.
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 small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CKAD question in full detail.
Application Deployment — This question tests Application Deployment — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The pod is in Terminating state on the failed node and the ReplicaSet waits for it to be fully deleted — Option C is correct because when a node fails, the pod on that node enters the Terminating state (as the kubelet is unreachable to confirm deletion). The ReplicaSet controller waits for the pod to be fully deleted before creating a replacement, due to the default terminationGracePeriodSeconds (30s) plus the node failure detection time (up to node-monitor-grace-period, default 40s). This delay is compounded by the pod's status not being updated until the node controller marks the node as unreachable, causing the ReplicaSet to not immediately create a new pod.
What should I do if I get this CKAD question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "most likely", "always", "immediately / without restart". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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