Microsoft AZ-204 Online Practice Questions and Exam Preparation

Microsoft AZ-204 Online Questions & Answers

• Question 531:

  You are building a web application that performs image analysis on user photos and returns metadata containing objects identified. The image is very costly in terms of time and compute resources. You are planning to use Azure Redis Cache so duplicate uploads do not need to be reprocessed.

  In case of an Azure data center outage, metadata loss must be kept to a minimum. You need to configure the Azure Redis cache instance.

  Which two actions should you perform?

  A. Configure Azure Redis with AOF persistence.
  B. Configure Azure Redis with RDB persistence.
  C. Configure second storage account for persistence.
  D. Set backup frequency to the minimum value.
  A. Configure Azure Redis with AOF persistence.
  C. Configure second storage account for persistence.

  ---

  Explanation

  "RDB is NOT good if you need to minimize the chance of data loss in case Redis stops working". source:

  https://redis.io/docs/management/persistence/

  since the question doesn't mention ZRS for Redis cache, we can use AOF with a 2nd storage to store replica cache data. check the config with

  AOF:

  https://learn.microsoft.com/en-us/azure/azure-cache-for-redis/cache-how-to-premium-

  persistence#set-up-data-persistence

• Question 532:

  HOTSPOT

  You are developing an application to store millions of images in Azure blob storage.

  The application has the following requirements:

  Store the Exif (exchangeable image file format) data from the image as blob metadata when the application uploads the image.

  Retrieve the Exif data from the image while minimizing bandwidth and processing time.

  Utilizes the REST API.

  You need to use the image Exif data as blob metadata in the application.

  Which HTTP verbs should you use? To answer, select the appropriate options in the answer area.

  NOTE: Each correct selection is worth one point.

  

  

  ---

  Box 1: PUT

  Store Exif data

  Store the Exif (exchangeable image file format) data from the image as blob metadata when the application uploads the image.

  Utilizes the REST API.

  Setting Metadata Headers

  The PUT operation sets metadata headers on the specified container or blob, overwriting any existing metadata on the resource. Calling PUT without any headers on the request clears all existing metadata on the resource.

  Box 2: HEAD

  Retrieve Exif data

  Retrieve the Exif data from the image while minimizing bandwidth and processing time.

  Utilizes the REST API.

  Containers and blobs support custom metadata, represented as HTTP headers. Metadata headers can be set on a request that creates a new container or blob resource, or on a request that explicitly creates a property on an existing resource.

  Retrieving Properties and Metadata

  The GET and HEAD operations both retrieve metadata headers for the specified container or blob. The HEAD operation returns headers only; it does not return a response body.

  Note: The Blob service exposes the following resource types via the REST API:

  Account. A storage account is a globally uniquely identified entity within the storage system. The account is the parent namespace for the Blob service. All containers are associated with an account.

  Containers. A container is a user-defined set of blobs within an account. A container resource has no associated content, only properties and metadata.

  Blobs. A blob is an entity representing a set of content. A blob resource includes content, properties, and metadata.

  You can address each resource using its resource URI. For information about URI addresses, see Referring to Containers and Blobs.

  Each resource supports operations based on the HTTP verbs GET, PUT, HEAD, and DELETE.

  https://learn.microsoft.com/en-us/rest/api/storageservices/setting-and-retrieving-properties-and-metadata-for-blob-resources

  https://learn.microsoft.com/en-us/rest/api/storageservices/http-operations-on-blob-service-resources

• Question 533:

  You are developing a solution that will use Azure messaging services.

  You need to ensure that the solution uses a publish-subscribe model and eliminates the need for constant polling.

  What are two possible ways to achieve the goal? Each correct answer presents a complete solution.

  NOTE: Each correct selection is worth one point.

  A. Service Bus
  B. Event Hub
  C. Event Grid
  D. Queue
  A. Service Bus
  C. Event Grid

  ---

  Explanation

  It is strongly recommended to use available messaging products and services that support a publish-subscribe model, rather than building your own. In Azure, consider using Service Bus or Event Grid. Other technologies that can be used for pub/sub messaging include Redis, RabbitMQ, and Apache Kafka.

  https://docs.microsoft.com/en-us/azure/architecture/patterns/publisher-subscriber

• Question 534:

  HOTSPOT

  You are developing an Azure Function App by using Visual Studio. The app will process orders input by an Azure Web App. The web app places the order information into Azure Queue Storage.

  You need to review the Azure Function App code shown below.

  

  NOTE: Each correct selection is worth one point.

  

  

  ---

  Box 1: No

  ExpirationTime - The time that the message expires.

  InsertionTime - The time that the message was added to the queue.

  Box 2: Yes

  maxDequeueCount - The number of times to try processing a message before moving it to the poison queue. Default value is 5.

  Box 3: Yes

  When there are multiple queue messages waiting, the queue trigger retrieves a batch of messages and invokes function instances concurrently to process them. By default, the batch size is 16. When the number being processed gets down to 8, the runtime gets another batch and starts processing those messages. So the maximum number of concurrent messages being processed per function on one virtual machine (VM) is 24.

  Box 4: Yes

  https://docs.microsoft.com/en-us/azure/azure-functions/functions-bindings-storage-queue

• Question 535:

  You develop Azure Durable Functions to manage vehicle loans.

  The loan process includes multiple actions that must be run in a specified order. One of the actions includes a customer credit check process, which may require multiple days to process.

  You need to implement Azure Durable Functions for the loan process.

  Which Azure Durable Functions type should you use?

  A. orchestrator
  B. client
  C. activity
  D. entity
  A. orchestrator

  ---

  Explanation

  Durable Functions is an extension of Azure Functions. You can use an orchestrator function to orchestrate the execution of other Durable functions within a function app. Orchestrator functions have the following characteristics:

  Orchestrator functions define function workflows using procedural code. No declarative schemas or designers are needed.

  Orchestrator functions can call other durable functions synchronously and asynchronously. Output from called functions can be reliably saved to local variables.

  Orchestrator functions are durable and reliable. Execution progress is automatically checkpointed when the function "awaits" or "yields". Local state is never lost when the process recycles or the VM reboots.

  Orchestrator functions can be long-running. The total lifespan of an orchestration instance can be seconds, days, months, or never-ending.

  https://learn.microsoft.com/en-us/azure/azure-functions/durable/durable-functions-orchestrations

• Question 536:

  DRAG DROP

  You develop an ASP.NET Core MVC application. You configure the application to track webpages and custom events.

  You need to identify trends in application usage.

  Which Azure Application Insights Usage Analysis features should you use? To answer, drag the appropriate features to the correct requirements. Each feature may be used once, more than once, or not at all. You may need to drag the split bar between panes or scroll to view content.

  NOTE: Each correct selection is worth one point.

  Select and Place:

  

  

  ---

  Box 1: Users

  Box 2: Impact

  One way to think of Impact is as the ultimate tool for settling arguments with someone on your team about how slowness in some aspect of your site is affecting whether users stick around. While users may tolerate a certain amount of slowness, Impact gives you insight into how best to balance optimization and performance to maximize user conversion.

  Box 3: Retention

  The retention feature in Azure Application Insights helps you analyze how many users return to your app, and how often they perform particular tasks or achieve goals. For example, if you run a game site, you could compare the numbers of users who return to the site after losing a game with the number who return after winning. This knowledge can help you improve both your user experience and your business strategy.

  Box 4: User flows

  The User Flows tool visualizes how users navigate between the pages and features of your site. It's great for answering questions like:

  1. How do users navigate away from a page on your site?

  2. What do users click on a page on your site?

  3. Where are the places that users churn most from your site?

  4. Are there places where users repeat the same action over and over?

  Incorrect Answers:

  Funnel: If your application involves multiple stages, you need to know if most customers are progressing through the entire process, or if they are ending the process at some point. The progression through a series of steps in a web application is known as a funnel. You can use Azure Application Insights Funnels to gain insights into your users, and monitor step-by-step conversion rates.

  https://docs.microsoft.com/en-us/azure/azure-monitor/app/usage-impact

• Question 537:

  You need to implement the processing of enqueuer inventory items.

  Which message value should you use?

  A. Session identifier
  B. Sequence number
  C. Partition key
  D. Time stamp
  B. Sequence number

• Question 538:

  HOTSPOT

  You are developing an Azure-hosted e-commerce web application. The application will use Azure Cosmos DB to store sales orders. You are using the latest SDK to manage the sales orders in the database.

  You create a new Azure Cosmos DB instance. You include a valid endpoint and valid authorization key to an appSettings.json file in the code project.

  You are evaluating the following application code: (Line number are included for reference only.)

  

  For each of the following statements, select Yes if the statement is true. Otherwise, select No.

  NOTE: Each correct selection is worth one point.

  

  

  ---

  Box 1: Yes

  The createDatabaseIfNotExistsAsync method checks if a database exists, and if it doesn't, create it.

  The Database.CreateContainerAsync method creates a container as an asynchronous operation in the Azure Cosmos service.

  Box 2: Yes

  The CosmosContainer.CreateItemAsync method creates an item as an asynchronous operation in the Azure Cosmos service.

  Box 3: Yes

  https://docs.microsoft.com/en-us/dotnet/api/microsoft.azure.cosmos.cosmosclient.createdatabaseifnotexistsasync

  https://docs.microsoft.com/en-us/dotnet/api/microsoft.azure.cosmos.database.createcontainerasync

  https://docs.microsoft.com/en-us/dotnet/api/azure.cosmos.cosmoscontainer.createitemasync

• Question 539:

  You are developing an application that applies a set of governance policies for internal and external services, as well as for applications.

  You develop a stateful ASP.NET Core 2.1 web application named PolicyApp and deploy it to an Azure App Service Web App. The PolicyApp reacts to events from Azure Event Grid and performs policy actions based on those events.

  You have the following requirements:

  Authentication events must be used to monitor users when they sign in and sign out. All authentication events must be processed by PolicyApp.

  Sign outs must be processed as fast as possible.

  What should you do?

  A. Create a new Azure Event Grid subscription for all authentication events. Use the subscription to process sign-out events.
  B. Create a separate Azure Event Grid handler for sign-in and sign-out events.
  C. Create separate Azure Event Grid topics and subscriptions for sign-in and sign-out events.
  D. Add a subject prefix to sign-out events. Create an Azure Event Grid subscription. Configure the subscription to use the subjectBeginsWith filter.
  D. Add a subject prefix to sign-out events. Create an Azure Event Grid subscription. Configure the subscription to use the subjectBeginsWith filter.

  ---

  Explanation

  https://docs.microsoft.com/en-us/azure/event-grid/subscription-creation-schema

• Question 540:

  HOTSPOT

  You are building a traffic monitoring system that monitors traffic along six highways. The system produces time series analysis-based reports for each highway. Data from traffic sensors are stored in Azure Event Hub.

  Traffic data is consumed by four departments. Each department has an Azure Web App that displays the time-series-based reports and contains a WebJob that processes the incoming data from Event Hub. All Web Apps run on App Service Plans with three instances.

  Data throughout must be maximized. Latency must be minimized.

  You need to implement the Azure Event Hub.

  Which settings should you use? To answer, select the appropriate options in the answer area.

  NOTE: Each correct selection is worth one point.

  

  

  ---

  Box 1: 6

  The number of partitions is specified at creation and must be between 2 and 32.

  There are 6 highways.

  Box 2: Highway

  References:

  https://docs.microsoft.com/en-us/azure/event-hubs/event-hubs-features