Microsoft Microsoft Certifications AZ-204 Questions & Answers

• Question 451:

  You use Azure Table storage to store customer information for an application. The data contains customer details and is partitioned by last name.

  You need to create a query that returns all customers with the last name Smith.

  Which code segment should you use?

  A. TableQuery.GenerateFilterCondition("PartitionKey", Equals, "Smith")

  B. TableQuery.GenerateFilterCondition("LastName", Equals, "Smith")

  C. TableQuery.GenerateFilterCondition("PartitionKey", QueryComparisons.Equal, "Smith")

  D. TableQuery.GenerateFilterCondition("LastName", QueryComparisons.Equal, "Smith")

  Correct Answer: C

  Retrieve all entities in a partition. The following code example specifies a filter for entities where 'Smith' is the partition key. This example prints the fields of each entity in the query results to the console. Construct the query operation for all customer entities where PartitionKey="Smith".

  TableQuery query = new TableQuery().Where(TableQuery.GenerateFilterCondition("PartitionKey", QueryComparisons.Equal, "Smith"));

  References: https://docs.microsoft.com/en-us/azure/cosmos-db/table-storage-how-to-use-dotnet

• Question 452:

  You must implement Application Insights instrumentation capabilities utilizing the Azure Mobile Apps SDK to provide meaningful analysis of user interactions with a molbile app.

  You need to capture the data required to implement the Usage Analytics feature of Application Insights.

  Which three data values should you capture? Each correct answer presents part of the solution.

  NOTE: Each correct selection is worth one point.

  A. Trace

  B. Session Id

  C. Exception

  D. User Id

  E. Events

  Correct Answer: ADE

  Application Insights is a service for monitoring the performance and usage of your apps. This module allows you to send telemetry of various kinds (events, traces, etc.) to the Application Insights service where your data can be visualized in the Azure Portal.

  Application Insights manages the ID of a session for you.

  References: https://github.com/microsoft/ApplicationInsights-Android

• Question 453:

  You are a developer for a SaaS company that offers many web services. All web services for the company must meet the following requirements:

  1.

  Use API Management to access the services

  2.

  Use OpenID Connect for authentication.

  3.

  Prevent anonymous usage

  A recent security audit found that several web services can be called without any authentication.

  Which API Management policy should you implement?

  A. validate-jwt

  B. jsonp

  C. authentication-certificate

  D. check-header

  Correct Answer: A

  Add the validate-jwt policy to validate the OAuth token for every incoming request. Incorrect Answers:

  B: The jsonp policy adds JSON with padding (JSONP) support to an operation or an API to allow cross-domain calls from JavaScript browser-based clients. JSONP is a method used in JavaScript programs to request data from a server in a different domain. JSONP bypasses the limitation enforced by most web browsers where access to web pages must be in the same domain.

  JSONP - Adds JSON with padding (JSONP) support to an operation or an API to allow cross-domain calls from JavaScript browser-based clients. References:https://docs.microsoft.com/en-us/azure/api-management/api-management-howto-protect-backend-with-aad

• Question 454:

  You develop a website. You plan to host the website in Azure. You expect the website to experience high traffic volumes after it is published.

  You must ensure that the website remains available and responsive while minimizing cost.

  You need to deploy the website.

  What should you do?

  A. Deploy the website to a virtual machine. Configure the virtual machine to automatically scale when the CPU load is high.

  B. Deploy the website to an App Service that uses the Shared service tier. Configure the App service plan to automatically scale when the CPU load is high.

  C. Deploy the website to an App Service that uses the Standard service tier. Configure the App service plan to automatically scale when the CPU load is high.

  D. Deploy the website to a virtual machine. Configure a Scale Set to increase the virtual machine instance count when the CPU load is high.

  Correct Answer: C

  Windows Azure Web Sites (WAWS) offers 3 modes: Standard, Free, and Shared.

  Standard mode carries an enterprise-grade SLA (Service Level Agreement) of 99.9% monthly, even for sites with just one instance.

  Standard mode runs on dedicated instances, making it different from the other ways to buy Windows Azure Web Sites.

  Incorrect Answers:

  B: Shared and Free modes do not offer the scaling flexibility of Standard, and they have some important limits.

  Shared mode, just as the name states, also uses shared Compute resources, and also has a CPU limit. So, while neither Free nor Shared is likely to be the best choice for your production environment due to these limits.

• Question 455:

  You are developing a mobile instant messaging app for a company.

  The mobile app must meet the following requirements:

  Support offline data sync.

  Update the latest messages during normal sync cycles.

  You need to implement Offline Data Sync.

  Which two actions should you perform? Each correct answer presents part of the solution.

  NOTE: Each correct selection is worth one point.

  A. Retrieve records from Offline Data Sync on every call to the PullAsync method.

  B. Retrieve records from Offline Data Sync using an Incremental Sync.

  C. Push records to Offline Data Sync using an Incremental Sync.

  D. Return the updatedAt column from the Mobile Service Backend and implement sorting by using the column.

  E. Return the updatedAt column from the Mobile Service Backend and implement sorting by the message id.

  Correct Answer: BE

  B: Incremental Sync: the first parameter to the pull operation is a query name that is used only on the client. If you use a non-null query name, the Azure Mobile SDK performs an incremental sync. Each time a pull operation returns a set of results, the latest updatedAt timestamp from that result set is stored in the SDK local system tables. Subsequent pull operations retrieve only records after that timestamp.

  E (not D): To use incremental sync, your server must return meaningful updatedAt values and must also support sorting by this field. However, since the SDK adds its own sort on the updatedAt field, you cannot use a pull query that has its own orderBy clause.

  References: https://docs.microsoft.com/en-us/azure/app-service-mobile/app-service-mobile-offline-data-sync

• Question 456:

  You are implementing an Azure API app that uses built-in authentication and authorization functionality.

  All app actions must be associated with information about the current user.

  You need to retrieve the information about the current user.

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

  NOTE: Each correct selection is worth one point.

  A. HTTP headers

  B. environment variables

  C. /.auth/me HTTP endpoint

  D. /.auth/login endpoint

  Correct Answer: AC

  A: After App Service Authentication has been configured, users trying to access your API are prompted to sign in with their organizational account that belongs to the same Azure AD as the Azure AD application used to secure the API. After signing in, you are able to access the information about the current user through the HttpContext.Current.User property.

  C: While the server code has access to request headers, client code can access GET /.auth/me to get the same access tokens (

  References: https://docs.microsoft.com/en-us/azure/app-service/app-service-web-tutorial-auth-aad https://docs.microsoft.com/en-us/sharepoint/dev/spfx/web-parts/guidance/connect-to-api-secured-with-aad

• Question 457:

  You develop a serverless application using several Azure Functions. These functions connect to data from within the code.

  You want to configure tracing for an Azure Function App project.

  You need to change configuration settings in the host.json file.

  Which tool should you use?

  A. Visual Studio

  B. Azure portal

  C. Azure PowerShell

  D. Azure Functions Core Tools (Azure CLI)

  Correct Answer: B

  The function editor built into the Azure portal lets you update the function.json file and the code file for a function. The host.json file, which contains some runtime-specific configurations, is in the root folder of the function app.

  

  References: https://docs.microsoft.com/en-us/azure/azure-functions/functions-reference#fileupdate

• Question 458:

  You are writing code to create and run an Azure Batch job.

  You have created a pool of compute nodes.

  You need to choose the right class and its method to submit a batch job to the Batch service.

  Which method should you use?

  A. JobOperations.EnableJobAsync(String, IEnumerable,CancellationToken)

  B. JobOperations.CreateJob()

  C. CloudJob.Enable(IEnumerable)

  D. JobOperations.EnableJob(String,IEnumerable)

  E. CloudJob.CommitAsync(IEnumerable, CancellationToken)

  Correct Answer: E

  A Batch job is a logical grouping of one or more tasks. A job includes settings common to the tasks, such as priority and the pool to run tasks on. The app uses the BatchClient.JobOperations.CreateJob method to create a job on your pool.

  The Commit method submits the job to the Batch service. Initially the job has no tasks.

  {

  CloudJob job = batchClient.JobOperations.CreateJob();

  job.Id = JobId;

  job.PoolInformation = new PoolInformation { PoolId = PoolId };

  job.Commit();

  }

  ...

  References:

  https://docs.microsoft.com/en-us/azure/batch/quick-run-dotnet

• Question 459:

  You are developing a software solution for an autonomous transportation system. The solution uses large data sets and Azure Batch processing to simulate navigation sets for entire fleets of vehicles.

  You need to create compute nodes for the solution on Azure Batch.

  What should you do?

  A. In the Azure portal, add a Job to a Batch account.

  B. In a .NET method, call the method: BatchClient.PoolOperations.CreateJob

  C. In Python, implement the class: JobAddParameter

  D. In Azure CLI, run the command: az batch pool create

  Correct Answer: B

  A Batch job is a logical grouping of one or more tasks. A job includes settings common to the tasks, such as priority and the pool to run tasks on. The app uses the BatchClient.JobOperations.CreateJob method to create a job on your pool.

  Note:

  Step 1: Create a pool of compute nodes. When you create a pool, you specify the number of compute nodes for the pool, their size, and the operating system. When each task in your job runs, it's assigned to execute on one of the nodes in

  your pool.

  Step 2 : Create a job. A job manages a collection of tasks. You associate each job to a specific pool where that job's tasks will run. Step 3: Add tasks to the job. Each task runs the application or script that you uploaded to process the data

  files it downloads from your Storage account. As each task completes, it can upload its output to Azure Storage.

  Incorrect Answers:

  C: To create a Batch pool in Python, the app uses the PoolAddParameter class to set the number of nodes, VM size, and a pool configuration.

  References: https://docs.microsoft.com/en-us/azure/batch/quick-run-dotnet

• Question 460:

  You are developing a software solution for an autonomous transportation system. The solution uses large data sets and Azure Batch processing to simulate navigation sets for entire fleets of vehicles.

  You need to create compute nodes for the solution on Azure Batch.

  What should you do?

  A. In the Azure portal, create a Batch account.

  B. In a .NET method, call the method: BatchClient.PoolOperations.CreatePool

  C. In Python, implement the class: JobAddParameter

  D. In Python, implement the class: TaskAddParameter

  Correct Answer: B

  A Batch job is a logical grouping of one or more tasks. A job includes settings common to the tasks, such as priority and the pool to run tasks on. The app uses the BatchClient.JobOperations.CreateJob method to create a job on your pool.

  Incorrect Answers:

  C, D: To create a Batch pool in Python, the app uses the PoolAddParameter class to set the number of nodes, VM size, and a pool configuration.

  References:

  https://docs.microsoft.com/en-us/azure/batch/quick-run-dotnet

  https://docs.microsoft.com/en-us/azure/batch/quick-run-python