AZ-900 Describe Azure architecture and services Practice Test 21 — 15 Questions

Question 1

What does Azure Auto-Shutdown for virtual machines provide?

Accepted Answer

Automatic daily power-off of VMs at a configured time to reduce costs. Azure Auto-Shutdown is a cost-saving feature that automatically powers off virtual machines at a user-defined schedule (e.g., nightly at 7 PM). It helps reduce compute costs by ensuring VMs are not running when not needed, but does not delete or modify the VM's configuration or resources.

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Automatic deletion of VMs that haven't been used for 30 days

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Automatic scaling down of VM CPU when under low utilization

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Automatic failover of VMs to another region during outages

Question 2

Which Azure service provides a high-performance computing environment for running scientific, financial, and engineering simulations?

Accepted Answer

Azure Batch. Azure Batch is a cloud-based job scheduling and compute management service designed for large-scale parallel and high-performance computing (HPC) workloads. It automatically provisions and manages a pool of virtual machines, installs the required software, schedules tasks, and scales resources based on job demands, making it ideal for running scientific simulations, financial risk modeling, and engineering analysis.

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Azure Functions

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Azure Container Instances

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Azure App Service

Question 3

Which Azure compute size family is optimized for memory-intensive workloads like large in-memory analytics or SAP HANA?

Accepted Answer

Memory-optimized VMs (M-series, E-series). Memory-optimized VMs, such as the M-series and E-series, are designed with a high memory-to-core ratio and large memory capacities (up to 12 TB for M-series) to handle workloads that require massive amounts of RAM, such as large in-memory analytics and SAP HANA. SAP HANA specifically requires certified VM sizes with sufficient memory to load the entire database into RAM, and Azure's M-series is SAP-certified for this purpose.

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Compute-optimized VMs (Fsv2-series)

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Storage-optimized VMs (Lsv2-series)

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GPU VMs (NC-series)

Question 4

Which Azure storage feature enables you to recover previous versions of blob files that were accidentally deleted or overwritten?

Accepted Answer

Blob versioning and soft delete. Blob versioning and soft delete work together to protect blob data. Soft delete retains deleted blobs for a specified retention period, while versioning automatically saves previous versions of blobs when they are overwritten or deleted. This allows you to recover blob files to any previous state, directly addressing the scenario of accidental deletion or overwrite.

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Azure Backup for Blob Storage

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Azure Site Recovery for storage

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Geo-redundant storage (GRS)

Question 5

Which Azure service provides a managed platform for deploying and running microservices as containers without managing the Kubernetes control plane?

Accepted Answer

Azure Container Apps. Azure Container Apps is a fully managed serverless platform for deploying and running microservices as containers without requiring any management of the underlying Kubernetes control plane. It abstracts away Kubernetes orchestration, providing built-in autoscaling, ingress, and secrets management, making it ideal for event-driven or containerized microservices where operational overhead must be minimized.

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Azure Kubernetes Service

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Azure Container Instances

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Azure App Service

Question 6

Which Azure service can detect faces in images and identify emotions, facial attributes, and recognize specific individuals?

Accepted Answer

Azure Face API. Azure Face API is the correct service because it is specifically designed to detect human faces in images, analyze facial attributes such as emotions (e.g., happiness, sadness), and recognize specific individuals through face identification and verification. Unlike general-purpose image analysis services, Face API provides dedicated facial recognition capabilities, including person identification against a pre-enrolled database.

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Azure Computer Vision

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Azure Custom Vision

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Azure Video Analyzer

Question 7

Which Azure service allows developers to store application configuration settings centrally and toggle feature flags?

Accepted Answer

Azure App Configuration. Azure App Configuration is a managed service specifically designed for centrally storing application configuration settings and feature flags. It provides a unified hub for managing configuration across multiple environments and applications, with built-in support for dynamic updates and feature management without redeploying code.

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Azure Key Vault

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Azure App Service settings

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Azure Storage Table

Question 8

Which Azure database service stores time-series data from IoT devices for long-term trend analysis and anomaly detection?

Accepted Answer

Azure Data Explorer. Azure Data Explorer (ADX) is a fully managed, high-performance big data analytics service optimized for interactive analysis of large volumes of time-series and log data. It uses the Kusto Query Language (KQL) to ingest, index, and query streaming telemetry from IoT devices, enabling long-term trend analysis and anomaly detection through built-in time-series functions like `series_decompose()` and `series_fit_line()`.

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Azure Cosmos DB

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Azure Table Storage

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Azure SQL Database

Question 9

Which Azure service provides managed relational database compatible with open-source PostgreSQL?

Accepted Answer

Azure Database for PostgreSQL. Azure Database for PostgreSQL is a fully managed relational database service specifically built for PostgreSQL, providing high availability, automated backups, and built-in security. It is the correct choice because it directly offers a managed PostgreSQL-compatible database without requiring any middleware or translation layer.

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Azure SQL Managed Instance

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Azure Cosmos DB for PostgreSQL

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Azure SQL Database Hyperscale

Question 10

Which Azure service provides low-cost, hot-standby disaster recovery for Azure VMs by replicating them to another region?

Accepted Answer

Azure Site Recovery for Azure VMs. Azure Site Recovery (ASR) for Azure VMs is the correct service because it provides low-cost, hot-standby disaster recovery by orchestrating replication, failover, and failback of Azure VMs from one region to another. It uses continuous replication with near-synchronous recovery point objectives (RPOs) and supports automated testing of failovers without impacting production workloads.

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Azure Backup

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Geo-Redundant Storage (GRS)

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Azure Zone-Redundant deployment

Question 11

Which Azure service provides a visual designer for building data transformation and movement pipelines between data stores?

Accepted Answer

Azure Data Factory. Azure Data Factory (ADF) is the correct answer because it is a cloud-based ETL and data integration service that provides a visual designer (the ADF authoring canvas) for building data transformation and movement pipelines. These pipelines can copy data between over 90 supported on-premises and cloud data stores, and they can include transformations using mapping data flows or external compute services like Azure HDInsight and Azure Databricks.

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Azure Synapse Analytics Studio

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Azure Databricks

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Azure Stream Analytics

Question 12

Which Azure networking service allows applications to send notifications to iOS, Android, and Windows devices with a single API call?

Accepted Answer

Azure Notification Hubs. Azure Notification Hubs is a scalable push notification engine that enables sending notifications to any platform (iOS, Android, Windows, etc.) from a single API call. It abstracts the complexities of platform-specific notification services (e.g., APNs for iOS, FCM for Android, WNS for Windows) and handles device registration, template formatting, and delivery retries.

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Azure Service Bus

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Azure Event Grid

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Azure Communication Services

Question 13

Which Azure service provides managed Apache Kafka streaming without managing brokers or Zookeeper?

Accepted Answer

Azure Event Hubs with Kafka endpoint. Azure Event Hubs with Kafka endpoint is correct because it provides a fully managed, real-time data streaming platform that is compatible with Apache Kafka producer and consumer APIs, allowing you to stream data into Event Hubs without managing any Kafka brokers or Zookeeper nodes. This service abstracts the underlying cluster management, scaling, and availability, making it a true serverless Kafka experience.

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Azure Service Bus with Kafka protocol

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Azure HDInsight Kafka cluster

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Azure Stream Analytics with Kafka input

Question 14

Which Azure feature provides Just-In-Time (JIT) VM access to reduce the attack surface of management ports?

Accepted Answer

JIT VM Access in Microsoft Defender for Cloud. Just-In-Time (JIT) VM access in Microsoft Defender for Cloud reduces the attack surface by locking down inbound traffic to VMs, only opening management ports (e.g., RDP port 3389 or SSH port 22) when requested and for a specific time window. This is the correct feature because it directly implements JIT access to management ports, as described in the question.

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Azure Bastion

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Azure AD Privileged Identity Management

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Azure Key Vault Certificate access

Question 15

Which Azure service provides a dedicated hardware security module (HSM) for generating and storing cryptographic keys?

Accepted Answer

Azure Dedicated HSM. Azure Dedicated HSM provides a single-tenant, FIPS 140-2 Level 3 validated hardware security module that is fully under your control, allowing you to generate and store cryptographic keys in a dedicated appliance. Unlike Key Vault, which is a multi-tenant software-based service, Dedicated HSM gives you exclusive access to the HSM hardware for compliance and high-security workloads.

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Azure Key Vault Standard tier

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Azure Key Vault Premium tier

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Azure Confidential Computing