Custom domain configuration in Firebase - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ service_behavior

intermediate

What happens after adding a custom domain in Firebase Hosting?

You add a custom domain to your Firebase Hosting project and verify ownership. What is the expected behavior immediately after this setup?

A The custom domain will serve content only over HTTP until you enable HTTPS in the Firebase console.

B You must manually upload an SSL certificate before the site is served on HTTPS.

C Firebase automatically provisions an SSL certificate and starts serving your site on HTTPS for the custom domain.

D Firebase Hosting will serve the site on the custom domain only after you deploy your site again.

💡 Hint

Think about Firebase Hosting's automatic security features.

Firebase Hosting automatically provisions SSL certificates for custom domains, enabling HTTPS without manual steps.

❓ Configuration

intermediate

Which DNS record is required to verify a custom domain in Firebase?

To verify ownership of a custom domain in Firebase Hosting, which DNS record must you add to your domain's DNS settings?

A A CNAME record pointing to firebaseapp.com.

B A TXT record with a Firebase verification token.

C An MX record with Firebase's mail server address.

D An SRV record specifying Firebase Hosting service.

💡 Hint

Verification usually involves proving domain ownership via a special text entry.

Firebase requires a TXT record with a verification token to confirm domain ownership before enabling hosting.

❓ Architecture

advanced

How does Firebase Hosting handle traffic routing for multiple custom domains?

You have configured multiple custom domains for a single Firebase Hosting site. How does Firebase route incoming requests?

A Firebase routes requests based on the Host header to the same content for all configured domains.

B Firebase requires separate hosting sites for each custom domain to route traffic correctly.

C Requests are routed randomly among the configured domains unless you set up redirects.

D Firebase uses IP-based routing to distinguish traffic for each custom domain.

💡 Hint

Consider how web servers use the Host header to serve content.

Firebase Hosting uses the Host header in HTTP requests to serve the same content for all custom domains linked to the site.

❓ security

advanced

What security feature does Firebase Hosting provide automatically for custom domains?

After adding a custom domain to Firebase Hosting, which security feature is automatically enabled to protect your site?

A Automatic HTTPS with free SSL certificates from Let's Encrypt.

B Mandatory two-factor authentication for all visitors.

C IP whitelisting to restrict access to your site.

D Automatic firewall rules blocking all non-Google IPs.

💡 Hint

Think about how Firebase secures traffic between browsers and servers.

Firebase Hosting automatically provisions SSL certificates via Let's Encrypt to enable HTTPS on custom domains.

✅ Best Practice

expert

What is the recommended approach to handle subdomain redirects in Firebase Hosting?

You want to redirect all traffic from blog.example.com to www.example.com/blog. What is the best way to configure this in Firebase Hosting?

Firebase

firebase.json

A Configure a Firebase Cloud Function to handle requests to <code>blog.example.com</code> and respond with a redirect.

B Set up a DNS CNAME record from <code>blog.example.com</code> to <code>www.example.com/blog</code>.

C Use Firebase Hosting rewrite rules to redirect <code>blog.example.com</code> to <code>/blog</code> on <code>www.example.com</code>.

D Create a Firebase Hosting redirect rule in <code>firebase.json</code> that redirects <code>blog.example.com</code> to <code>https://www.example.com/blog</code>.

💡 Hint

Consider how Firebase Hosting handles domain-based redirects in its configuration file.

Firebase Hosting supports domain-based redirects configured in firebase.json redirect rules specifying source domain and target URL.