The answer is user-defined routes (UDRs) on spoke subnets and private DNS zones linked to the VNets or resolved through a central DNS design. UDRs are required because they force all outbound traffic from spoke subnets to the central firewall or network virtual appliance (NVA) in the hub, enabling centralized outbound inspection; without them, spoke VMs would bypass the firewall and use default internet access. Private DNS zones are equally critical because they allow spokes to resolve private endpoint DNS names privately, ensuring that traffic to PaaS services stays within the Microsoft backbone rather than leaking over the internet. On the AZ-305 exam, this pairing tests your understanding of how to combine network security with DNS resolution in a hub-spoke network, often appearing as a scenario where you must prevent direct outbound access while maintaining private endpoint connectivity. A common trap is choosing only the firewall or only the DNS zone, forgetting that both are required. Memory tip: think “Route to inspect, DNS to connect”—UDRs route traffic for inspection, while private DNS zones resolve names for private endpoints.
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 hub-and-spoke Azure network must centralize outbound inspection and still allow spokes to resolve private endpoint DNS names. Which two components are commonly required? (Choose 2.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
User-defined routes from spoke subnets to the firewall or NVA.
Option A is correct because user-defined routes (UDRs) on spoke subnets force all outbound traffic (including internet-bound traffic) to the central firewall or network virtual appliance (NVA) in the hub, enabling centralized inspection. Without UDRs, spoke VMs would bypass the firewall and use default outbound internet access, breaking the inspection requirement.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
User-defined routes from spoke subnets to the firewall or NVA.
Why this is correct
UDRs steer traffic through the inspection point.
Related concept
Read the scenario before looking for a memorised answer.
✓
Private DNS zones linked to the VNets or resolved through a central DNS design.
Why this is correct
Private endpoints require correct private DNS resolution.
Related concept
Read the scenario before looking for a memorised answer.
✗
A public IP address on every private endpoint.
Why it's wrong here
Private endpoints use private IP addresses.
✗
Basic SKU load balancers in each spoke.
Why it's wrong here
Load balancers are not required for DNS resolution or centralized egress inspection.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume private endpoints require public IPs for DNS resolution, but Azure Private DNS zones resolve FQDNs to private IPs, and UDRs handle traffic routing without needing public exposure.
Detailed technical explanation
How to think about this question
Private DNS zones linked to the hub and spoke VNets (or a central DNS resolution design) allow spoke resources to resolve private endpoint FQDNs to private IP addresses, avoiding public DNS. Under the hood, Azure Private DNS zones use auto-registration and virtual network links to propagate records, and when combined with UDRs, traffic flows through the firewall while DNS queries remain private and resolved within the Azure backbone.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
Design infrastructure solutions — This question tests Design infrastructure solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: User-defined routes from spoke subnets to the firewall or NVA. — Option A is correct because user-defined routes (UDRs) on spoke subnets force all outbound traffic (including internet-bound traffic) to the central firewall or network virtual appliance (NVA) in the hub, enabling centralized inspection. Without UDRs, spoke VMs would bypass the firewall and use default outbound internet access, breaking the inspection requirement.
What should I do if I get this AZ-305 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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