- A
Azure Cache for Redis (Premium tier)
The Premium tier of Azure Cache for Redis provides features like data persistence (RDB/AOF), clustering, and zone redundancy with replication across availability zones for high availability. It is fully managed.
- B
Azure Cache for Redis (Basic tier)
Why wrong: The Basic tier is a single-node cache with no SLA, no data persistence, and no replication. It is not suitable for production scenarios requiring high availability and persistence.
- C
Azure Cache for Redis (Standard tier)
Why wrong: The Standard tier offers replication (two nodes) and a 99.9% SLA, but it does not support data persistence or zone redundancy. It is suitable for high availability but not for persistence across zones.
- D
Azure Cache for Redis (Enterprise tier)
Why wrong: The Enterprise tier supports data persistence and zone redundancy, but it is based on Redis Enterprise, which is more expensive. While it meets requirements, the Premium tier is the appropriate and more common choice for in-region zone redundancy and persistence.
Quick Answer
The correct choice is Azure Cache for Redis Premium tier because it uniquely combines data persistence with zone redundancy, making it ideal for session state and frequently accessed product data that must survive failures across availability zones. The Premium tier supports both RDB and AOF persistence options, ensuring session data is not lost during a restart, while its zone redundancy feature replicates cached data across multiple availability zones within the same region for high availability. On the AZ-305 exam, this scenario tests your ability to match caching requirements to the correct tier, with a common trap being the Standard tier—it offers replication but lacks both persistence and zone redundancy, which the question explicitly requires. Remember that Basic is for dev/test only, Standard adds replication but no persistence or zones, and Enterprise is overkill for session state. Memory tip: “Premium Persists across Zones” — if you need persistence plus zone redundancy, skip Standard and go Premium.
AZ-305 Design data storage solutions Practice Question
This AZ-305 practice question tests your understanding of design data storage solutions. 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.
A company deploys a web application on Azure VMs. The application stores session state and frequently accessed product data. They need a low-latency, in-memory cache to reduce database load and improve response times. The cache must be managed and support data persistence with replication across availability zones within the region. Which Azure service and tier should they choose?
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
Azure Cache for Redis (Premium tier)
Azure Cache for Redis Premium tier is the correct choice because it supports data persistence (RDB/AOF), replication across availability zones via zone redundancy, and provides low-latency, in-memory caching for session state and product data. The Basic tier lacks replication and persistence, Standard tier offers replication but not zone redundancy or persistence, and Enterprise tier is overkill for this scenario, adding unnecessary cost and complexity.
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.
- ✓
Azure Cache for Redis (Premium tier)
Why this is correct
The Premium tier of Azure Cache for Redis provides features like data persistence (RDB/AOF), clustering, and zone redundancy with replication across availability zones for high availability. It is fully managed.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Azure Cache for Redis (Basic tier)
Why it's wrong here
The Basic tier is a single-node cache with no SLA, no data persistence, and no replication. It is not suitable for production scenarios requiring high availability and persistence.
- ✗
Azure Cache for Redis (Standard tier)
Why it's wrong here
The Standard tier offers replication (two nodes) and a 99.9% SLA, but it does not support data persistence or zone redundancy. It is suitable for high availability but not for persistence across zones.
- ✗
Azure Cache for Redis (Enterprise tier)
Why it's wrong here
The Enterprise tier supports data persistence and zone redundancy, but it is based on Redis Enterprise, which is more expensive. While it meets requirements, the Premium tier is the appropriate and more common choice for in-region zone redundancy and persistence.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse the Standard tier's replication (which is within a single datacenter) with zone redundancy, or assume Enterprise tier is always better for persistence, when Premium tier specifically offers both persistence and zone redundancy at a lower cost.
Trap categories for this question
Scenario analysis trap
The Basic tier is a single-node cache with no SLA, no data persistence, and no replication. It is not suitable for production scenarios requiring high availability and persistence.
Detailed technical explanation
How to think about this question
Azure Cache for Redis Premium tier uses Redis persistence via RDB snapshots or AOF logs, stored in a managed storage account, ensuring data survives restarts. Zone redundancy in Premium tier replicates data across three availability zones within a region, providing resilience against zonal failures while maintaining sub-millisecond latency. The Enterprise tier, built on Redis Enterprise, uses a different architecture with OSS cluster policy and active geo-replication, but for single-region, zone-redundant persistence, Premium is the optimal and cost-effective choice.
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 startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
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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Design data storage solutions — study guide chapter
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FAQ
Questions learners often ask
What does this AZ-305 question test?
Design data storage solutions — This question tests Design data storage solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Azure Cache for Redis (Premium tier) — Azure Cache for Redis Premium tier is the correct choice because it supports data persistence (RDB/AOF), replication across availability zones via zone redundancy, and provides low-latency, in-memory caching for session state and product data. The Basic tier lacks replication and persistence, Standard tier offers replication but not zone redundancy or persistence, and Enterprise tier is overkill for this scenario, adding unnecessary cost and complexity.
What should I do if I get this AZ-305 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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Same concept, more angles
1 more ways this is tested on AZ-305
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A company uses Azure Redis Cache to improve the performance of a web application. They need to ensure that cached data survives a failover to a secondary region. Which Azure Redis Cache tier should they choose?
medium- A.Standard tier
- B.Basic tier
- ✓ C.Premium tier
- D.Enterprise tier
Why C: Azure Redis Cache Premium tier supports geo-replication for cross-region disaster recovery. Standard tier only replicates within a datacenter. Basic tier has no replication. Enterprise tier also supports geo-replication but is more expensive and complex.
Last reviewed: Jun 11, 2026
This AZ-305 practice question is part of Courseiva's free Microsoft 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 AZ-305 exam.
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