AI-200 practice: Configure and deploy function apps

Question 1

An AI orchestration function needs to call a database only reachable via VNET integration, must avoid cold-start delays for latency-sensitive requests, and occasionally runs single invocations longer than the 10-minute default execution limit on the Consumption plan.

Which hosting plan should you choose?

Accepted Answer

Premium plan, which supports VNET integration, pre-warmed instances to avoid cold starts, and longer execution durations than the Consumption plan

Answer

Consumption plan, because automatic scale-to-zero and per-execution billing make it the best fit for any latency-sensitive, long-running VNET-integrated workload

Answer

Dedicated (App Service) plan only, because Azure Functions cannot use VNET integration on Premium or Flex Consumption under any configuration

Answer

Flex Consumption with the default timeout unchanged, treating VNET integration and cold-start avoidance as unrelated to the chosen hosting plan

Question 2

Which Azure CLI command deploys local function app code to an existing Azure Function App?

Accepted Answer

func azure functionapp publish myFunctionApp

Answer

az functionapp create --name myFunctionApp

Answer

az webapp deploy --name myFunctionApp --type zip

Answer

docker push myFunctionApp:latest to a registry

Question 3

Which Azure Functions hosting plan should you choose for an AI workload that must avoid cold starts entirely and needs predictable, dedicated compute with support for longer execution times?

Accepted Answer

Premium or Dedicated App Service plan

Answer

Consumption plan with possible cold starts

Answer

Static Web Apps free tier hosting only

Answer

No hosting plan required for Functions

Question 4

You are choosing a hosting plan for a Python function app that enriches documents with Azure OpenAI. It must reach a private Cosmos DB endpoint through VNet integration, scale to zero overnight to save cost, and optionally keep a few always-ready instances for the busiest function. Which plan meets every requirement?

Accepted Answer

Flex Consumption plan

Answer

Consumption plan

Answer

Premium plan (EP1)

Answer

Dedicated App Service plan (P1v3)

Question 5

After you switch a function app to zip deployment with `WEBSITE_RUN_FROM_PACKAGE=1`, a function that writes a temporary prompt-template cache to its own `site/wwwroot` folder starts failing with a read-only file system error. What is the correct fix?

Accepted Answer

Write the cache to the temp directory (for example tempfile.gettempdir()) or to external storage instead of the app folder

Answer

Remove WEBSITE_RUN_FROM_PACKAGE so the deployment unpacks into a writable folder, and keep writing to wwwroot

Answer

Grant the app's managed identity Storage Blob Data Contributor on its deployment storage account

Answer

Set functionTimeout to -1 in host.json so the write has time to finish

Question 6

Security wants to remove the storage account key from the `AzureWebJobsStorage` setting of a function app. The app has a system-assigned managed identity. Which configuration lets the Functions host keep using the storage account?

Accepted Answer

Replace it with AzureWebJobsStorage__accountName=<account> and grant the identity data roles on the account, such as Storage Blob Data Owner

Answer

Delete AzureWebJobsStorage entirely; the host falls back to an internal Microsoft-managed account

Answer

Replace the key in the connection string with a SAS token that expires after 10 years

Answer

Set AzureWebJobsStorage to a Key Vault reference that holds the original connection string

Question 7

A function on the Consumption plan re-embeds a document batch and needs about 8 minutes. It's always cut off at 5 minutes with a timeout error. What should you change?

Accepted Answer

Set "functionTimeout": "00:10:00" in host.json

Answer

Set the app setting FUNCTIONS_WORKER_PROCESS_COUNT=2

Answer

Set "functionTimeout": "-1" in host.json for unlimited execution on Consumption

Answer

Increase the HTTP request timeout in the Azure Load Balancer settings

Question 8

A developer on Windows deploys a Python function app to a Linux plan. The functions fail at startup with `ModuleNotFoundError` for `numpy` and `psycopg`, even though both are listed in `requirements.txt`. Which two approaches make Azure install the correct Linux dependencies during deployment? Select two.

Accepted Answer

Publish with func azure functionapp publish <app> --build remote

Accepted Answer

For zip deployments, set SCM_DO_BUILD_DURING_DEPLOYMENT=true so the platform runs a remote build from requirements.txt

Answer

Zip the local .venv folder from the Windows machine together with the code

Answer

Add "pythonPackages": ["numpy", "psycopg"] to host.json

Answer

Deploy only function_app.py, because packages are installed automatically on first request

Question 9

You are configuring a new function app to send telemetry to Application Insights. Which app setting should you use?

Accepted Answer

APPLICATIONINSIGHTS_CONNECTION_STRING

Answer

APPINSIGHTS_INSTRUMENTATIONKEY

Answer

AzureWebJobsDashboard

Answer

logging.applicationInsights.enabled in local.settings.json

Question 10

Which Azure CLI command creates an Azure Function App backed by a Consumption (serverless) hosting plan?

Accepted Answer

az functionapp create --name myFuncApp --resource-group myRG --consumption-plan-location eastus --runtime python --storage-account mystorage

Answer

az webapp create --name myFuncApp --resource-group myRG --plan myPlan --runtime "python:3.11" --deployment-local-git

Answer

az functionapp plan create --name myPlan --resource-group myRG --sku EP1 --is-linux --location eastus --min-instances 1

Answer

az functionapp deployment source config-zip --name myFuncApp --resource-group myRG --src ./app.zip --build-remote true

11 questions