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CDN with custom domains in Azure - Cheat Sheet & Quick Revision

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beginner
What is a CDN and why is it used?
A CDN (Content Delivery Network) is a system of servers distributed globally to deliver web content quickly to users by caching content closer to their location. It reduces latency and improves load times.
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beginner
What does a custom domain mean in the context of a CDN?
A custom domain is a user-owned domain name (like www.example.com) that is linked to the CDN endpoint so users access content via a familiar URL instead of the default CDN URL.
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intermediate
How do you configure a custom domain with Azure CDN?
You create a CDN endpoint, then add your custom domain to it. You verify domain ownership by creating a DNS CNAME record pointing your domain to the CDN endpoint hostname.
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intermediate
Why is HTTPS important for custom domains on a CDN and how is it enabled in Azure?
HTTPS secures data between users and CDN. Azure CDN supports HTTPS for custom domains by enabling Azure-managed certificates or uploading your own SSL certificate.
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beginner
What is the role of DNS CNAME records in setting up a custom domain for a CDN?
A CNAME record maps your custom domain to the CDN endpoint hostname. This tells browsers to fetch content from the CDN when users visit your domain.
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What is the first step to use a custom domain with Azure CDN?
AEnable HTTPS
BBuy a new domain
CCreate a CDN endpoint
DUpload SSL certificate
Which DNS record type is used to link a custom domain to an Azure CDN endpoint?
ACNAME record
BMX record
CA record
DTXT record
How does Azure CDN provide HTTPS for custom domains by default?
AAzure-managed SSL certificates
BUser must upload certificates
CHTTPS is not supported
DUse third-party CDN
What benefit does a CDN provide when using a custom domain?
ADatabase management
BFaster content delivery
CDomain registration
DEmail hosting
What must you verify to add a custom domain to Azure CDN?
AAzure subscription type
BSSL certificate validity
CUser login credentials
DDomain ownership
Explain the process of setting up a custom domain with Azure CDN from start to finish.
Think about the steps involving Azure portal and DNS settings.
You got /5 concepts.
    Why is HTTPS important for custom domains on a CDN and how does Azure simplify enabling it?
    Consider user trust and ease of management.
    You got /4 concepts.

      Practice

      (1/5)
      1. What is the primary purpose of using a custom domain with Azure CDN?
      easy
      A. To deliver content using your own website address instead of the default CDN URL
      B. To increase the storage capacity of the CDN
      C. To reduce the cost of CDN services
      D. To disable HTTPS on the CDN endpoint

      Solution

      1. Step 1: Understand CDN default behavior

        Azure CDN provides a default URL for content delivery, but it uses a generic domain name.

      2. Step 2: Purpose of custom domain

        Using a custom domain lets you serve content with your own website address, improving branding and user trust.

      3. Final Answer:

        To deliver content using your own website address instead of the default CDN URL -> Option A

      4. Quick Check:

        Custom domain = Own website address [OK]
      Hint: Custom domain means your own website address on CDN [OK]
      Common Mistakes:
      • Thinking custom domain increases storage
      • Assuming custom domain reduces cost
      • Believing custom domain disables HTTPS
      2. Which DNS record type must you create to map your custom domain to an Azure CDN endpoint?
      easy
      A. CNAME record
      B. SRV record
      C. TXT record
      D. MX record

      Solution

      1. Step 1: Identify DNS record for domain aliasing

        CNAME records map one domain name to another, which is needed to point your custom domain to the CDN endpoint.

      2. Step 2: Exclude other DNS record types

        MX is for mail, TXT for text info, SRV for service location, none suitable for domain aliasing.

      3. Final Answer:

        CNAME record -> Option A

      4. Quick Check:

        Custom domain uses CNAME DNS record [OK]
      Hint: Custom domain points to CDN via CNAME record [OK]
      Common Mistakes:
      • Using MX record for domain mapping
      • Confusing TXT record with CNAME
      • Trying to use SRV record for CDN
      3. Given the following Azure CLI command snippet to add a custom domain to a CDN endpoint, what will happen if the DNS CNAME record is not set correctly? 
      az cdn custom-domain create --endpoint-name myEndpoint --profile-name myProfile --resource-group myGroup --hostname www.example.com
      medium
      A. The custom domain will be added successfully without any issues
      B. The CDN endpoint will automatically create the DNS record
      C. The custom domain will be added but HTTPS will be disabled
      D. The command will fail with a DNS validation error

      Solution

      1. Step 1: Understand DNS validation in Azure CDN

        Azure CDN requires DNS validation to confirm ownership of the custom domain via CNAME record.

      2. Step 2: Effect of missing or incorrect DNS record

        If the CNAME record is missing or incorrect, the command fails with a DNS validation error to prevent misconfiguration.

      3. Final Answer:

        The command will fail with a DNS validation error -> Option D

      4. Quick Check:

        Missing CNAME causes DNS validation error [OK]
      Hint: DNS must validate custom domain or command fails [OK]
      Common Mistakes:
      • Assuming CDN auto-creates DNS records
      • Thinking custom domain adds without DNS setup
      • Believing HTTPS disables if DNS is wrong
      4. You added a custom domain to your Azure CDN endpoint but HTTPS is not working. Which of the following is the most likely cause?
      medium
      A. The CDN endpoint does not support HTTPS at all
      B. You used an A record instead of a CNAME record in DNS
      C. You forgot to enable HTTPS on the custom domain in the CDN settings
      D. The CDN profile is in a different Azure region than your resource group

      Solution

      1. Step 1: Check HTTPS enablement for custom domain

        Azure CDN requires explicit enabling of HTTPS on custom domains to serve secure content.

      2. Step 2: Exclude other causes

        CDN endpoints support HTTPS, A record usage causes DNS issues but not HTTPS directly, region mismatch does not block HTTPS.

      3. Final Answer:

        You forgot to enable HTTPS on the custom domain in the CDN settings -> Option C

      4. Quick Check:

        HTTPS must be enabled on custom domain [OK]
      Hint: Enable HTTPS explicitly for custom domain [OK]
      Common Mistakes:
      • Assuming HTTPS is automatic
      • Blaming region mismatch for HTTPS failure
      • Using A record instead of CNAME but ignoring HTTPS setting
      5. You want to design a scalable Azure CDN solution with a custom domain that supports HTTPS and handles millions of users globally. Which combination of steps is the best practice?
      hard
      A. Create a CDN profile only, add your custom domain with an A record, disable HTTPS to reduce latency, and rely on a single CDN POP
      B. Create a CDN profile and endpoint, add your custom domain with a CNAME DNS record, enable HTTPS with Azure-managed certificates, and use multiple CDN POPs worldwide
      C. Create multiple CDN profiles for each region, add custom domains without DNS changes, and enable HTTPS manually with self-signed certificates
      D. Use Azure CDN without custom domains, enable HTTPS, and configure DNS to point directly to the origin server

      Solution

      1. Step 1: Setup CDN profile and endpoint with custom domain

        Create a CDN profile and endpoint, then add your custom domain using a CNAME DNS record for proper domain mapping.

      2. Step 2: Enable HTTPS and use global CDN POPs

        Enable HTTPS using Azure-managed certificates for security and scalability, and leverage multiple CDN Points of Presence (POPs) worldwide to handle global traffic efficiently.

      3. Final Answer:

        Create a CDN profile and endpoint, add your custom domain with a CNAME DNS record, enable HTTPS with Azure-managed certificates, and use multiple CDN POPs worldwide -> Option B

      4. Quick Check:

        Custom domain + CNAME + HTTPS + global POPs = Best practice [OK]
      Hint: Use CNAME, enable HTTPS, and leverage global CDN POPs [OK]
      Common Mistakes:
      • Using A record instead of CNAME
      • Disabling HTTPS to save latency
      • Skipping DNS changes for custom domains
      • Relying on single CDN POP for global scale