Azure Front Door overview - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ service_behavior

intermediate

How does Azure Front Door handle incoming user requests?

Azure Front Door is a service that helps deliver your web applications faster and more securely. When a user sends a request to your website, how does Azure Front Door decide where to send that request?

A It sends the request to the closest backend server based on the user's geographic location and health of the backend.

B It sends the request to the backend server with the highest CPU usage to balance load.

C It randomly picks any backend server regardless of location or health status.

D It always sends the request to the first backend server listed in the configuration, ignoring location or health.

💡 Hint

Think about how a service can improve speed and reliability by choosing the best server.

Azure Front Door routes user requests to the backend server that is closest in terms of network latency and is healthy, ensuring fast and reliable delivery.

❓ Architecture

intermediate

Which Azure Front Door feature helps protect your web app from malicious attacks?

Azure Front Door offers several features to secure your web applications. Which feature specifically helps block common web attacks like SQL injection or cross-site scripting?

A Web Application Firewall (WAF)

B Load Balancer

C Content Delivery Network (CDN)

D Virtual Network Gateway

💡 Hint

Think about a shield that filters harmful web traffic.

The Web Application Firewall (WAF) feature in Azure Front Door inspects incoming traffic and blocks common web attacks to protect your application.

❓ Configuration

advanced

What is the effect of enabling session affinity in Azure Front Door?

Session affinity ensures that a user's requests are always sent to the same backend server during a session. What happens when you enable session affinity in Azure Front Door?

A User requests are routed to the backend server with the least network latency regardless of previous requests.

B User requests are routed to the same backend server based on a cookie, improving session consistency.

C User requests are distributed randomly to any backend server to balance load evenly.

D User requests are blocked if the backend server is busy, forcing retries.

💡 Hint

Think about how websites keep you logged in during a visit.

Session affinity uses cookies to keep a user's requests going to the same backend server, which helps maintain session state.

✅ Best Practice

advanced

Which practice improves Azure Front Door performance for global users?

You want to optimize your Azure Front Door setup to serve users worldwide with minimal delay. Which practice best achieves this?

A Set a very high time-to-live (TTL) for DNS records to avoid updates.

B Disable health probes to reduce backend server load.

C Use only one backend server in a single region to simplify management.

D Enable caching at Azure Front Door to store static content closer to users.

💡 Hint

Think about how storing copies of files near users can speed up delivery.

Enabling caching at Azure Front Door stores static content at edge locations, reducing latency and improving load times for global users.

❓ security

expert

What is the impact of configuring Azure Front Door with HTTPS only and redirect HTTP to HTTPS?

You configure Azure Front Door to accept only HTTPS traffic and to redirect all HTTP requests to HTTPS. What is the main impact of this configuration?

A Azure Front Door blocks all HTTP requests without redirecting, causing errors.

B Users can access the site using HTTP without encryption, which improves speed.

C All user traffic is encrypted, improving security and preventing data interception.

D Only backend servers need to support HTTPS; user requests can use HTTP.

💡 Hint

Think about how HTTPS protects data between users and your site.

Redirecting HTTP to HTTPS ensures all traffic is encrypted, protecting user data from interception or tampering.

Practice

1. What is the primary purpose of Azure Front Door?

easy

A. To route user traffic globally for faster access

B. To store large amounts of data

C. To create virtual machines

D. To manage databases

Solution

1. Step 1: Understand Azure Front Door's role

   Azure Front Door is designed to route user traffic globally to improve speed and performance.

2. Step 2: Compare with other options

   Storing data, creating VMs, and managing databases are not functions of Azure Front Door.

3. Final Answer:

   To route user traffic globally for faster access -> Option A

4. Quick Check:

   Routing traffic globally = C [OK]

Hint: Focus on traffic routing and speed improvement [OK]

Common Mistakes:

• Confusing Front Door with storage services
• Thinking it manages databases
• Assuming it creates virtual machines

2. Which of the following is the correct way to describe Azure Front Door's load balancing?

easy

A. It balances load only within a single data center

B. It balances load only for databases

C. It does not support load balancing

D. It balances load globally across multiple regions

Solution

1. Step 1: Identify Azure Front Door's load balancing scope

   Azure Front Door balances load globally across multiple regions to improve availability and performance.

2. Step 2: Eliminate incorrect options

   It is not limited to a single data center, does support load balancing, and is not specific to databases.

3. Final Answer:

   It balances load globally across multiple regions -> Option D

4. Quick Check:

   Global load balancing = D [OK]

Hint: Remember Front Door works across regions, not just one place [OK]

Common Mistakes:

• Thinking load balancing is local only
• Believing Front Door lacks load balancing
• Confusing load balancing with database management

3. Given this scenario: A user accesses a website behind Azure Front Door from Europe, but the backend servers are in the US and Asia. What will Azure Front Door do?

medium

A. Always route the user to the US backend server

B. Route the user to the closest backend server based on latency

C. Route the user randomly to any backend server

D. Block the user because of geographic distance

Solution

1. Step 1: Understand Azure Front Door's routing logic

   Azure Front Door routes user traffic to the backend server with the lowest latency, usually the closest one.

2. Step 2: Analyze the options

   Routing always to US or random routing ignores latency optimization; blocking users due to distance is incorrect.

3. Final Answer:

   Route the user to the closest backend server based on latency -> Option B

4. Quick Check:

   Latency-based routing = B [OK]

Hint: Front Door picks backend with lowest latency for user [OK]

Common Mistakes:

• Assuming fixed routing to one region
• Thinking routing is random
• Believing Front Door blocks distant users

4. You configured Azure Front Door but users report they cannot access your site over HTTPS. What is the most likely cause?

medium

A. You forgot to create backend pools

B. Azure Front Door does not support HTTPS

C. You did not enable HTTPS on the Front Door frontend

D. You need to disable load balancing

Solution

1. Step 1: Check HTTPS configuration on Front Door

   Azure Front Door requires HTTPS to be enabled on the frontend to serve secure traffic.

2. Step 2: Review other options

   Azure Front Door supports HTTPS; backend pools and load balancing do not directly affect HTTPS availability.

3. Final Answer:

   You did not enable HTTPS on the Front Door frontend -> Option C

4. Quick Check:

   Enable HTTPS on frontend = A [OK]

Hint: Always enable HTTPS on Front Door frontend for secure access [OK]

Common Mistakes:

• Thinking Front Door lacks HTTPS support
• Ignoring frontend HTTPS settings
• Confusing backend pools with HTTPS issues

5. You want to improve your web app's availability and security globally using Azure Front Door. Which combination of features should you configure?

hard

A. Global load balancing, HTTPS enabled, Web Application Firewall (WAF)

B. Local load balancing, HTTP only, no firewall

C. Global load balancing, HTTP only, no firewall

D. Local load balancing, HTTPS enabled, no firewall

Solution

1. Step 1: Identify features for availability

   Global load balancing improves availability by routing traffic to healthy backends worldwide.

2. Step 2: Identify features for security

   HTTPS encrypts traffic; Web Application Firewall protects against attacks.

3. Step 3: Evaluate options

   Only Global load balancing, HTTPS enabled, Web Application Firewall (WAF) combines global load balancing, HTTPS, and WAF for best availability and security.

4. Final Answer:

   Global load balancing, HTTPS enabled, Web Application Firewall (WAF) -> Option A

5. Quick Check:

   Global load balancing + HTTPS + WAF = A [OK]

Hint: Combine global load balancing, HTTPS, and WAF for best results [OK]

Common Mistakes:

• Choosing HTTP only for security
• Ignoring WAF for protection
• Using local load balancing for global needs