Quick Answer
The answer is the `dnsNameLabel` property in the YAML definition for Azure Container Instances. This property assigns a custom DNS prefix to the container group’s public IP address, which, when combined with the Azure region’s default domain suffix like `eastus.azurecontainer.io`, forms a fully qualified domain name such as `<dnsNameLabel>.eastus.azurecontainer.io`. This allows clients to resolve the container group via DNS without relying on the raw IP address, which is critical for stable, human-readable endpoints in production. On the AZ-204 exam, this tests your understanding of ACI networking configuration, often appearing in scenarios where you must choose between YAML properties for public exposure. A common trap is confusing `dnsNameLabel` with `ipAddress` or `ports`—remember that only `dnsNameLabel` controls the DNS prefix, not the IP assignment. For a memory tip, think “DNS = Domain Name System, so the property must start with ‘dns’—and you ‘label’ it with your custom name.”
This AZ-204 practice question tests your understanding of develop azure compute solutions. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
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?
dnsNameLabel
Correct property for DNS name.
containerGroupName
Why wrong: Resource name, not DNS.
ipAddress
Why wrong: IP address property, not DNS label.
ports
Why wrong: Container ports.
Answer choices
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.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Common exam traps
The trap here is that 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.
Detailed technical explanation
Under the hood, when you set `dnsNameLabel`, Azure Container Instances automatically registers the FQDN in Azure DNS with a TTL of 3600 seconds. The FQDN resolves to the public IP address of the container group, which is ephemeral by default unless you configure `ipAddress.type: Public` and optionally set `ipAddress.dnsNameLabel`. This is particularly useful in scenarios where you need a stable hostname for client connections (e.g., a web API) but don't want to manage a separate DNS zone or Azure Front Door.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
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FAQ
Develop Azure compute solutions — This question tests Develop Azure compute solutions — Read the scenario before looking for a memorised answer..
The correct answer is: 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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
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