AZ-204 Develop Azure compute solutions Practice Question
You need to deploy a containerized application to Azure Container Instances (ACI) with a public IP address and a DNS name label. Which YAML property should you configure for the DNS name?
⚠ Common exam trap
Watch out — candidates often confuse `dnsNameLabel` with `containerGroupName` or `ipAddress`, mistakenly thinking the container group name or the IP address property itself controls the DNS label, when in fact `dnsNameLabel` is a nested property under `ipAddress` in the YAML schema.
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
✓
dnsNameLabel
The `dnsNameLabel` property in the Azure Container Instances YAML definition is used to assign a custom DNS prefix to the container group's public IP address. When combined with the Azure region's default domain suffix (e.g., `eastus.azurecontainer.io`), this creates a fully qualified domain name (FQDN) like `<dnsNameLabel>.eastus.azurecontainer.io`, allowing clients to resolve the container group via DNS without needing the raw IP address.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
dnsNameLabel
Why this is correct
The "dnsNameLabel" property is the correct configuration element used to assign a public, human-readable DNS name to an Azure Container Instance (ACI) container group. When specified, Azure automatically registers a DNS record in the format `dnsNameLabel.region.azurecontainer.io`, enabling external clients to access the containerized application via a stable, memorable FQDN rather than just an IP address. This is crucial for public internet accessibility.
- ✗
containerGroupName
Why it's wrong here
The "containerGroupName" property defines the unique identifier for the Azure Container Instance resource within a specific resource group. While essential for managing and referencing the container group within the Azure control plane, it serves purely as an administrative resource name and does not directly contribute to or form part of the public DNS name used for accessing the application over the internet. It's an internal Azure resource identifier.
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ipAddress
Why it's wrong here
The "ipAddress" property within an Azure Container Instance definition is used to configure the network settings, specifically determining if the container group should have a public IP address and its type. While a public IP address is a prerequisite for internet accessibility, this property itself defines the underlying network address resource, not the human-readable DNS label that resolves to that IP address. A DNS label provides a layer of abstraction over the raw IP.
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ports
Why it's wrong here
The "ports" property specifies which network ports are exposed by the container within the container group, defining the internal communication endpoints for the application and the firewall rules for the container group. These ports are critical for the application's network functionality, but this property solely dictates port exposure and has no direct role in defining or configuring the public DNS name label for the container group's external access.
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Written by Johnson Ajibi, MSc IT Security
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