Google PCA Manage implementation of cloud architecture Practice Question
This PCA practice question tests your understanding of manage implementation of cloud architecture. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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.
Exhibit
Refer to the exhibit.
gcloud container clusters describe prod-cluster --region us-central1
...
networkPolicy:
enabled: true
provider: CALICO
...
The cluster is using Calico network policies. A developer deploys a manifest that defines a NetworkPolicy that allows ingress from pods with label 'app: frontend' but the traffic is still blocked. The pod logs show no network error but the connection times out.
What is the most likely reason the NetworkPolicy is not taking effect?
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.
Refer to the exhibit.
gcloud container clusters describe prod-cluster --region us-central1
...
networkPolicy:
enabled: true
provider: CALICO
...
The cluster is using Calico network policies. A developer deploys a manifest that defines a NetworkPolicy that allows ingress from pods with label 'app: frontend' but the traffic is still blocked. The pod logs show no network error but the connection times out.
A
The developer used the networking.k8s.io/v1 API version instead of the Calico CRD projectcalico.org/v3.
GKE with Calico expects Calico-specific CRDs for full functionality.
B
The cluster has a global network policy that overrides per-namespace policies.
Why wrong: GKE supports global policy but not implicitly overriding.
C
The pod labels do not match because of a capitalization mismatch.
Why wrong: Labels are case-sensitive but 'app: frontend' matches if correct.
D
The NetworkPolicy is missing a spec.podSelector.matchLabels entry.
Why wrong: Even if missing, default selects all pods.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The developer used the networking.k8s.io/v1 API version instead of the Calico CRD projectcalico.org/v3.
The NetworkPolicy is not taking effect because the developer used the standard Kubernetes API version `networking.k8s.io/v1`, which defines a different schema and behavior than the Calico CRD `projectcalico.org/v3`. Calico NetworkPolicies support advanced features like order-of-precedence, global policies, and non-IP match criteria that are not available in the native Kubernetes NetworkPolicy API. When a Calico-specific policy is defined using the wrong API version, the cluster's policy engine (Calico) ignores it, resulting in no enforcement.
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 developer used the networking.k8s.io/v1 API version instead of the Calico CRD projectcalico.org/v3.
Why this is correct
GKE with Calico expects Calico-specific CRDs for full functionality.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The cluster has a global network policy that overrides per-namespace policies.
Why it's wrong here
GKE supports global policy but not implicitly overriding.
✗
The pod labels do not match because of a capitalization mismatch.
Why it's wrong here
Labels are case-sensitive but 'app: frontend' matches if correct.
✗
The NetworkPolicy is missing a spec.podSelector.matchLabels entry.
Why it's wrong here
Even if missing, default selects all pods.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the distinction between native Kubernetes NetworkPolicies and CNI-specific CRDs (like Calico), trapping candidates who assume all NetworkPolicies use the same API version and ignore the need to match the policy engine's schema.
Detailed technical explanation
How to think about this question
Calico NetworkPolicies use a separate CRD (`projectcalico.org/v3`) that extends the Kubernetes NetworkPolicy model with features like ordered policy tiers, deny-by-default rules, and support for non-IP traffic (e.g., eBPF). When a policy is created under `networking.k8s.io/v1`, the Calico CNI plugin treats it as a native Kubernetes NetworkPolicy, which has a simpler schema and does not support Calico-specific fields like `order` or `types` with `Ingress`/`Egress` in the same way. In a real-world scenario, a developer might accidentally use the wrong API version when copying a Calico policy from documentation, leading to silent policy failure that is hard to debug without checking the API version in the YAML.
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 healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this PCA question in full detail.
Manage implementation of cloud architecture — This question tests Manage implementation of cloud architecture — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The developer used the networking.k8s.io/v1 API version instead of the Calico CRD projectcalico.org/v3. — The NetworkPolicy is not taking effect because the developer used the standard Kubernetes API version `networking.k8s.io/v1`, which defines a different schema and behavior than the Calico CRD `projectcalico.org/v3`. Calico NetworkPolicies support advanced features like order-of-precedence, global policies, and non-IP match criteria that are not available in the native Kubernetes NetworkPolicy API. When a Calico-specific policy is defined using the wrong API version, the cluster's policy engine (Calico) ignores it, resulting in no enforcement.
What should I do if I get this PCA 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". 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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