The correct answer is to configure network security groups (NSGs) to restrict traffic between tiers and enforce TLS for all inter-tier communication. This combination works because NSGs act as a virtual firewall, allowing you to define inbound and outbound rules that limit access—for example, permitting only the web front end to reach the API layer and only the API layer to reach the database—thereby enforcing a zero-trust network perimeter. Meanwhile, TLS (Transport Layer Security) encrypts data in transit, preventing eavesdropping or tampering as sensitive information moves between tiers. On the AZ-204 exam, this scenario tests your understanding of defense-in-depth for multi-tier applications, where a common trap is to rely solely on network controls or encryption alone. Remember that NSGs handle *who* can talk, while TLS secures *what* they say. Memory tip: think of NSGs as the bouncer at the door and TLS as the sealed envelope—both are needed for secure multi-tier communication.
AZ-204 Implement Azure security Practice Question
This AZ-204 practice question tests your understanding of implement azure security. 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 company is deploying a multi-tier application on Azure. The application consists of a web front end, an API layer, and a database. You need to ensure secure communication between tiers. Which TWO actions should you take? (Choose two.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use TLS for all internal service-to-service communication
Option C is correct because TLS (Transport Layer Security) encrypts data in transit between application tiers, preventing eavesdropping and man-in-the-middle attacks. For internal service-to-service communication, using TLS ensures that sensitive data passed between the web front end, API layer, and database remains confidential and tamper-proof, which is a fundamental security best practice for multi-tier applications.
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.
✗
Enable HTTPS on the web front end
Why it's wrong here
HTTPS secures client-to-web communication, not between internal tiers.
✗
Enable Azure Storage encryption at rest
Why it's wrong here
Encryption at rest protects stored data, not data in transit between tiers.
✓
Use TLS for all internal service-to-service communication
Why this is correct
TLS ensures encryption between API and database, and between web and API.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use managed identities to authenticate between tiers
Why it's wrong here
Managed identities provide authentication, not encryption of data in transit.
✓
Configure network security groups (NSGs) to allow only the web layer to access the API layer, and only the API layer to access the database
Why this is correct
NSGs provide network segmentation and restrict access to only necessary tiers.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse authentication (managed identities) with encryption (TLS), thinking that authenticating between tiers automatically secures the communication channel, when in fact encryption is required to protect data in transit.
Detailed technical explanation
How to think about this question
TLS 1.2 or 1.3 should be enforced for all internal HTTP-based calls, often by configuring mutual TLS (mTLS) for service-to-service authentication and encryption. In Azure, this can be implemented using Azure API Management policies, service endpoints with TLS, or by configuring application code to require HTTPS and validate certificates. A real-world scenario where this matters is when a microservices architecture uses internal load balancers—without TLS, traffic between containers in the same virtual network could be intercepted by a compromised pod.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-204 question in full detail.
Implement Azure security — This question tests Implement Azure security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use TLS for all internal service-to-service communication — Option C is correct because TLS (Transport Layer Security) encrypts data in transit between application tiers, preventing eavesdropping and man-in-the-middle attacks. For internal service-to-service communication, using TLS ensures that sensitive data passed between the web front end, API layer, and database remains confidential and tamper-proof, which is a fundamental security best practice for multi-tier applications.
What should I do if I get this AZ-204 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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