AZ-204 Develop for Azure storage Practice Question
Which FOUR of the following are features of Azure Storage replication that provide high availability?
⚠ Common exam trap
Microsoft often tests the misconception that CDN is a storage replication feature, but it is a separate service for content delivery and caching, not a redundancy mechanism for Azure Storage accounts.
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
✓
Locally redundant storage (LRS)
LRS (A) is correct because it replicates data three times synchronously within a single Azure region, protecting against hardware failures and providing high availability within that region. GZRS (B) is correct because it combines ZRS replication across availability zones in the primary region with asynchronous replication to a secondary region, delivering both zone-level and regional high availability. GRS (C) is correct because it replicates data three times synchronously in the primary region and asynchronously to a paired secondary region, providing durability and availability if the primary region fails. ZRS (D) is correct because it replicates data synchronously across three availability zones within a region, keeping data available even if one zone goes down. Azure CDN (E) is not a storage replication feature; it is a content delivery service that caches content at edge locations to reduce latency, not a replication mechanism for high availability of storage data.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Locally redundant storage (LRS)
Why this is correct
Locally redundant storage (LRS) is the most fundamental and cost-effective replication strategy, maintaining three synchronous copies of your data within a single physical location or datacenter in the primary Azure region. This approach provides durability against common hardware failures, such as disk or rack outages, but offers no protection against a datacenter-wide disaster. It is suitable for applications that can tolerate data loss in the event of a major regional outage or that can easily reconstruct data.
- ✓
Geo-zone-redundant storage (GZRS)
Why this is correct
Geo-zone-redundant storage (GZRS) is a highly resilient replication option that combines the benefits of ZRS and GRS. While it is a valid and powerful Azure Storage feature, the question asks for three *features of Azure Storage R* in the context of primary redundancy types. GZRS builds upon existing ZRS within the primary region and then asynchronously replicates that zone-redundant data to a single location in a secondary region, making it a composite strategy rather than a distinct base replication model like LRS, ZRS, or GRS.
- ✓
Geo-redundant storage (GRS)
Why this is correct
Geo-redundant storage (GRS) provides cross-regional data replication, ensuring high availability and disaster recovery by maintaining six copies of your data. It synchronously writes three copies within a single datacenter in the primary region (LRS), and then asynchronously replicates those three copies to a single physical location in a secondary, geographically distant Azure region. This strategy protects against regional outages, ensuring data availability even if the entire primary region becomes unavailable.
- ✓
Zone-redundant storage (ZRS)
Why this is correct
Zone-redundant storage (ZRS) replicates your data synchronously across three distinct Azure availability zones within a single primary region. Each availability zone is a physically separate location with independent power, cooling, and networking, providing excellent resilience against datacenter-level failures within that region. ZRS ensures data durability and high availability even if one or two availability zones in the primary region become unavailable.
- ✗
Azure Content Delivery Network (CDN)
Why it's wrong here
Azure Content Delivery Network (CDN) is a distributed network of servers designed to cache web content closer to users, thereby improving performance and reducing latency. While CDN involves data distribution, its primary function is content delivery and caching for faster access, not providing the underlying data redundancy or high availability features for the *source* Azure Storage account itself. It does not serve as a core data replication strategy for durability like LRS, ZRS, or GRS.
Go deeper
Related to this question
About these practice questions
Courseiva writes every AZ-204 question from scratch — 883 in total, each with an explanation and a wrong-answer breakdown. None are copied from real exams or dumps. Learn why practice questions differ from exam dumps →
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This AZ-204 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-204 exam.