AZ-305 Design infrastructure solutions Practice Question
This AZ-305 practice question tests your understanding of design infrastructure solutions. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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.
A company is designing a hybrid identity solution that allows users to access both on-premises applications and Microsoft 365 using a single identity. The solution must support legacy authentication protocols for on-premises apps and modern authentication for cloud apps. Which Azure service should the company use?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Microsoft Entra Application Proxy
Option A (Microsoft Entra ID) provides modern authentication but does not natively support legacy on-premises protocols. Option B (Microsoft Entra Connect) syncs identities to the cloud. Option C (Microsoft Entra Application Proxy) provides access to on-premises apps without requiring legacy protocols on the client side. Option D (Active Directory Federation Services) can be used but is not a managed Azure service. The best answer is Microsoft Entra Application Proxy, which enables secure access to on-premises apps using modern authentication while the proxy handles the legacy protocol translation.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Active Directory Federation Services (AD FS)
Why it's wrong here
AD FS is an on-premises component, not a managed Azure service.
✓
Microsoft Entra Application Proxy
Why this is correct
Application Proxy provides secure access to on-premises apps with modern authentication and supports legacy protocols.
Related concept
Static NAT maps one inside address to one outside address.
✗
Microsoft Entra ID
Why it's wrong here
Microsoft Entra ID alone does not support legacy authentication protocols for on-premises apps.
✗
Microsoft Entra Connect
Why it's wrong here
Microsoft Entra Connect syncs identities but does not provide application access.
Common exam traps
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.
Detailed technical explanation
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.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
A company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-305 question in full detail.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related AZ-305 NAT questions on configuration and troubleshooting.
Design infrastructure solutions — This question tests Design infrastructure solutions — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Microsoft Entra Application Proxy — Option A (Microsoft Entra ID) provides modern authentication but does not natively support legacy on-premises protocols. Option B (Microsoft Entra Connect) syncs identities to the cloud. Option C (Microsoft Entra Application Proxy) provides access to on-premises apps without requiring legacy protocols on the client side. Option D (Active Directory Federation Services) can be used but is not a managed Azure service. The best answer is Microsoft Entra Application Proxy, which enables secure access to on-premises apps using modern authentication while the proxy handles the legacy protocol translation.
What should I do if I get this AZ-305 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related AZ-305 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Question Discussion
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