- A
Configure Kubernetes TLS Secrets and mount them as volumes in each pod.
Why wrong: Manually managing TLS Secrets requires certificate rotation, application code to load certs, and doesn't provide automatic mTLS between services. This requires code changes and significant operational work.
- B
Enable Anthos Service Mesh with mTLS policy set to STRICT mode.
ASM (based on Istio) injects Envoy sidecars that handle mTLS automatically. In STRICT mode, all service-to-service communication requires mTLS. No application code changes needed — the sidecar handles everything.
- C
Use Cloud Armor to enforce TLS between services within the cluster.
Why wrong: Cloud Armor is an edge security service (WAF/DDoS protection) for internet-facing load balancers, not for in-cluster service-to-service encryption.
- D
Enable GKE node-to-node encryption to encrypt all traffic between nodes.
Why wrong: Node-to-node encryption encrypts traffic at the node level (host-to-host network layer), not at the application service level. It doesn't provide mTLS between specific services.
How to Enforce mTLS Between Services in GKE Without Code Changes
This ACE practice question tests your understanding of your organization mandates that all…. 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.
Your organization mandates that all service-to-service communication within a GKE cluster must be encrypted in transit using mutual TLS (mTLS). The team does not want to manage certificates or modify application code. Which solution meets these requirements?
Quick Answer
The answer is to enable Anthos Service Mesh with mTLS policy set to STRICT mode. This solution meets the requirement for mTLS service-to-service encryption in GKE without code changes because Anthos Service Mesh automatically injects Envoy sidecar proxies into each pod, handling all certificate issuance, rotation, and mutual TLS handshakes transparently at the infrastructure layer. On the Google Associate Cloud Engineer exam, this scenario tests your understanding that ASM decouples security from application logic—a common trap is assuming you need to modify deployments or use a separate certificate manager, but STRICT mode enforces encryption cluster-wide with zero application changes. Remember the key distinction: PERMISSIVE mode allows both plaintext and TLS traffic for gradual migration, while STRICT mode enforces mTLS exclusively. A useful memory tip is “STRICT means no exceptions—every service must talk TLS, no code required.”
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
Enable Anthos Service Mesh with mTLS policy set to STRICT mode.
Anthos Service Mesh (ASM) with mTLS set to STRICT mode enforces mutual TLS between all services in the mesh without requiring any application code changes or manual certificate management. ASM automatically injects Envoy sidecar proxies that handle certificate issuance, rotation, and encryption, meeting the requirement for encrypted service-to-service communication with mTLS.
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.
- ✗
Configure Kubernetes TLS Secrets and mount them as volumes in each pod.
Why it's wrong here
Manually managing TLS Secrets requires certificate rotation, application code to load certs, and doesn't provide automatic mTLS between services. This requires code changes and significant operational work.
- ✓
Enable Anthos Service Mesh with mTLS policy set to STRICT mode.
Why this is correct
ASM (based on Istio) injects Envoy sidecars that handle mTLS automatically. In STRICT mode, all service-to-service communication requires mTLS. No application code changes needed — the sidecar handles everything.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use Cloud Armor to enforce TLS between services within the cluster.
Why it's wrong here
Cloud Armor is an edge security service (WAF/DDoS protection) for internet-facing load balancers, not for in-cluster service-to-service encryption.
- ✗
Enable GKE node-to-node encryption to encrypt all traffic between nodes.
Why it's wrong here
Node-to-node encryption encrypts traffic at the node level (host-to-host network layer), not at the application service level. It doesn't provide mTLS between specific services.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the distinction between network-layer encryption (node-to-node) and application-layer mTLS (service-to-service), leading candidates to mistakenly choose node-to-node encryption as a solution for service-level mTLS requirements.
Detailed technical explanation
How to think about this question
Anthos Service Mesh leverages the Istio control plane to issue X.509 certificates to each Envoy sidecar proxy via the Citadel agent, enabling automatic mTLS. The STRICT mTLS policy (peerAuthentication) ensures that any service without a valid client certificate is rejected, providing both encryption and mutual authentication. Under the hood, the sidecar proxies intercept all TCP traffic using iptables rules and perform TLS handshakes transparently to the application containers.
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 cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
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 ACE question test?
Read the scenario before looking for a memorised answer.
What is the correct answer to this question?
The correct answer is: Enable Anthos Service Mesh with mTLS policy set to STRICT mode. — Anthos Service Mesh (ASM) with mTLS set to STRICT mode enforces mutual TLS between all services in the mesh without requiring any application code changes or manual certificate management. ASM automatically injects Envoy sidecar proxies that handle certificate issuance, rotation, and encryption, meeting the requirement for encrypted service-to-service communication with mTLS.
What should I do if I get this ACE 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: Jun 30, 2026
This ACE practice question is part of Courseiva's free Google Cloud certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the ACE exam.
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