Question 1hardmultiple choice
Full question →hardmultiple choiceObjective-mapped
A multinational company runs a web application that must serve users from around the world with low latency. The application is deployed in multiple Azure regions. The company also requires built-in protection against distributed denial-of-service (DDoS) attacks at the network layer. The solution must automatically route users to the closest healthy endpoint based on geographic location. Which Azure service should the company use?
Answer choices
Why each option matters
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
Distractor review
Azure Traffic Manager
Azure Traffic Manager provides DNS-based traffic routing to distribute traffic across regions based on performance, geographic, or priority methods, but it does not include built-in DDoS protection and does not act as a reverse proxy at the application layer.
B
Distractor review
Azure Load Balancer
Azure Load Balancer is a regional, layer 4 load balancer that distributes traffic within a single Azure region. It does not route users to the closest region globally and does not provide built-in DDoS protection at the network layer (only supports DDoS protection if a standard SKU and a DDoS protection plan is enabled separately, but it is not a global service).
C
Distractor review
Azure Application Gateway
Azure Application Gateway is a regional layer 7 load balancer with URL-based routing and Web Application Firewall (WAF) capabilities. It does not provide global geographic routing across regions and does not include built-in network-layer DDoS protection.
D
Best answer
Azure Front Door
Azure Front Door is a global, scalable entry point that uses Microsoft's global edge network to route users to the nearest healthy application endpoint based on latency or geography. It offers built-in DDoS protection at the network layer (L3/L4) as a standard feature, meeting both requirements.
Common exam trap
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Technical deep dive
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
- Static NAT maps one inside address to one outside address.
- PAT allows many inside hosts to share one public address using ports.
- Inside local and inside global describe the private and translated addresses.
- NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
- Identify inside and outside interfaces first.
- Check whether the scenario needs static NAT, dynamic NAT or PAT.
- Do not confuse NAT matching ACLs with normal packet-filtering intent.
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More questions from this exam
Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.
Question 1
A developer is building a serverless application that requires integration with an on-premises SQL Server database for real-time data processing. The on-premises network is connected to Azure via a site-to-site VPN. Which Azure service would allow the function to securely access the on-premises database without exposing it to the public internet?
Question 2
A solutions architect is designing a storage solution for a large media company. The company needs to store video files that are accessed infrequently but must be retained for several years for compliance. Which two Azure storage options meet these requirements? (Select two.)
Question 3
A company deploys a multi-tier application using Azure virtual machines. The web tier VMs must be evenly distributed across two distinct data centers within an Azure region to avoid a single point of failure from an infrastructure outage. Which Azure construct should they use to meet this requirement?
Question 4
A company wants to enforce a set of security policies across all their Azure subscriptions. They have created several individual policy definitions. Which Azure construct should they use to group these policies together and assign them as a single package?
Question 5
A company deploys a line-of-business application on an Azure virtual machine. The IT team wants to ensure the application remains secure. According to the shared responsibility model, which of the following security tasks is the sole responsibility of the customer (the company)?
Question 6
A company develops a web API that runs on Azure App Service. The development team wants to deploy a new version of the API to a staging environment, run integration tests against it, and then gradually shift production traffic to the new version. If any issues are detected, they want to immediately roll back to the previous version without redeploying. Which Azure App Service feature should the team use to meet these requirements?
FAQ
Questions learners often ask
What does this AZ-900 question test?
Static NAT maps one inside address to one outside address.
What is the correct answer to this question?
The correct answer is: Azure Front Door — Azure Front Door is Microsoft's global application delivery network. It provides intelligent traffic routing based on geographic location or latency, and includes built-in DDoS protection at the network layer (L3/L4) at no additional cost. The other services either lack global routing, DDoS protection, or both.
What should I do if I get this AZ-900 question wrong?
Then try more questions from the same exam bank and focus on understanding why the wrong options are tempting.
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