CKA Practice Question: Cluster Architecture, Installation & Configuration
This CKA practice question tests your understanding of cluster architecture, installation & configuration. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 system administrator needs to install a Kubernetes cluster using kubeadm. The control plane node must be initialized with a specific Pod network CIDR of 10.244.0.0/16 for Flannel. Which command should be used?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "which command"
Why it matters: Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
kubeadm init --pod-network-cidr 10.244.0.0/16
Option B is correct because `kubeadm init` uses the `--pod-network-cidr` flag to specify the CIDR range for Pod IP addresses, which is required by Flannel and other CNI plugins to allocate subnets to nodes. The 10.244.0.0/16 range is the default Pod network CIDR for Flannel, ensuring proper network configuration without conflicts.
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.
✗
kubeadm init --service-cidr 10.244.0.0/16
Why it's wrong here
--service-cidr is for service IP range, not pod network.
✓
kubeadm init --pod-network-cidr 10.244.0.0/16
Why this is correct
Correct flag to specify pod network CIDR for Flannel.
Clue confirmation
The clue word "which command" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
--apiserver-advertise-address is for API server IP, not pod network.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse `--pod-network-cidr` with `--service-cidr` or invent non-existent flags like `--network-cidr`, because kubeadm has multiple CIDR-related options and the exam tests precise flag recall.
Detailed technical explanation
How to think about this question
The `--pod-network-cidr` flag defines the overall Pod IP address pool from which each node receives a /24 subnet (by default) via the CNI plugin. Flannel uses this CIDR to assign Pod IPs and encapsulate traffic using VXLAN or host-gw backends; if the CIDR overlaps with the node's physical network or the service CIDR, routing failures occur. In production, you must ensure the Pod CIDR does not conflict with existing network ranges to avoid IP address collisions.
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 network engineer segments a warehouse floor into three subnets: 20 scanners, 5 printers, and 2 management hosts. Picking the wrong mask wastes addresses or leaves too few usable hosts. Exam questions test whether you can apply CIDR notation, calculate block size, and identify the correct usable-host range for a given prefix.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CKA question in full detail.
Cluster Architecture, Installation & Configuration — This question tests Cluster Architecture, Installation & Configuration — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: kubeadm init --pod-network-cidr 10.244.0.0/16 — Option B is correct because `kubeadm init` uses the `--pod-network-cidr` flag to specify the CIDR range for Pod IP addresses, which is required by Flannel and other CNI plugins to allocate subnets to nodes. The 10.244.0.0/16 range is the default Pod network CIDR for Flannel, ensuring proper network configuration without conflicts.
What should I do if I get this CKA 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: "which command". Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
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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