This KCNA practice question tests your understanding of container orchestration. 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.
Which THREE of the following are correct statements about Kubernetes Deployments?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
A Deployment manages ReplicaSets
A Deployment manages ReplicaSets, which in turn manage Pods. This is the core abstraction: the Deployment controller creates and updates ReplicaSets to achieve the desired state, and each ReplicaSet ensures a specified number of Pod replicas are running. This layered architecture enables features like rolling updates and rollbacks without the Deployment directly interacting with individual Pods.
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.
✗
Deployments support canary deployments natively
Why it's wrong here
Canary deployments require additional tools like service mesh or multiple Deployments.
✓
A Deployment manages ReplicaSets
Why this is correct
Deployment creates and manages ReplicaSets to ensure the desired state.
Related concept
Read the scenario before looking for a memorised answer.
✗
A Deployment directly manages Pods
Why it's wrong here
Deployment manages ReplicaSets, which manage Pods.
✓
The default update strategy is RollingUpdate
Why this is correct
The default strategy is RollingUpdate, which gradually replaces pods.
Related concept
Read the scenario before looking for a memorised answer.
✓
Deployment supports rolling back to an earlier revision
Why this is correct
Deployment retains revision history and allows rollback.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that Deployments directly manage Pods, when in fact they manage ReplicaSets, and that canary deployments are a built-in feature of Deployments, whereas they require external traffic management.
Detailed technical explanation
How to think about this question
Under the hood, the Deployment controller uses a hash-based label selector to create a new ReplicaSet for each revision; during a rolling update, it scales up the new ReplicaSet and scales down the old one, respecting maxSurge and maxUnavailable parameters (default 25%). This design allows rollbacks by reverting to a previous ReplicaSet revision, stored in the Deployment's revision history (default 10 revisions). In real-world scenarios, a misconfigured maxSurge can cause resource contention, and the revisionHistoryLimit must be tuned to balance rollback capability with etcd storage.
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 KCNA question in full detail.
Container Orchestration — This question tests Container Orchestration — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: A Deployment manages ReplicaSets — A Deployment manages ReplicaSets, which in turn manage Pods. This is the core abstraction: the Deployment controller creates and updates ReplicaSets to achieve the desired state, and each ReplicaSet ensures a specified number of Pod replicas are running. This layered architecture enables features like rolling updates and rollbacks without the Deployment directly interacting with individual Pods.
What should I do if I get this KCNA 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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Question Discussion
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