The answer is that you need to associate a route table to spoke subnets with a default route to the firewall private IP, and configure VNet peering between the spoke VNets and the hub VNet. This is correct because hub-and-spoke networking with Azure Firewall force tunneling relies on two core mechanisms: peering establishes the logical path for traffic to leave the isolated spoke and enter the hub, while the user-defined route (UDR) with 0.0.0.0/0 pointing to the firewall’s private IP ensures all outbound internet traffic is forcibly routed through the central firewall for inspection and control. On the AZ-305 exam, this scenario tests your understanding of forced tunneling patterns for centralized security, often appearing as a design question where a common trap is forgetting that peering alone does not redirect traffic—you must also override the default system route. A helpful memory tip is “Peer the path, point the packet”: peering connects the networks, and the route table points the outbound packets to the firewall.
AZ-305 Design infrastructure solutions Practice Question
This AZ-305 practice question tests your understanding of design infrastructure solutions. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 hub-and-spoke networking. Spoke VNets must use a central Azure Firewall for outbound internet traffic. Which two configurations are required?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Peer each spoke VNet with the hub VNet
B is correct because VNet peering is required to establish connectivity between the spoke VNets and the hub VNet, enabling traffic to flow through the central Azure Firewall. Without peering, the spoke VNets would be isolated and unable to route traffic to the hub. C is correct because a route table with a default route (0.0.0.0/0) pointing to the firewall's private IP ensures that all outbound internet traffic from spoke subnets is forced through the firewall for inspection and control.
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.
✗
Enable public IP addresses on all workload VMs
Why it's wrong here
Public IPs increase exposure and are not needed for forced-tunnel outbound inspection.
✓
Peer each spoke VNet with the hub VNet
Why this is correct
VNet peering provides private connectivity between hub and spokes.
Related concept
Read the scenario before looking for a memorised answer.
✓
Associate a route table to spoke subnets with a default route to the firewall private IP
Why this is correct
A UDR forces outbound traffic from spokes through the firewall.
Related concept
Read the scenario before looking for a memorised answer.
✗
Deploy a NAT gateway in every spoke subnet
Why it's wrong here
NAT gateways would bypass the central firewall design for outbound traffic.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume a NATgateway or public IPs on VMs are needed for outbound internet, but the correct design forces all traffic through the firewall using UDRs and peering, not direct egress.
Detailed technical explanation
How to think about this question
Under the hood, the route table with a 0.0.0.0/0 next hop to the firewall's private IP leverages Azure's system routes and user-defined routes (UDRs) to enforce asymmetric routing; the firewall must also have a corresponding route or be configured with DNAT/SNAT rules to handle return traffic. In a real-world scenario, if the firewall is deployed in a hub with Azure Firewall Manager, spoke VNets can be associated via virtual hub routing, but for manual hub-and-spoke, explicit peering and UDRs are mandatory.
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: Peer each spoke VNet with the hub VNet — B is correct because VNet peering is required to establish connectivity between the spoke VNets and the hub VNet, enabling traffic to flow through the central Azure Firewall. Without peering, the spoke VNets would be isolated and unable to route traffic to the hub. C is correct because a route table with a default route (0.0.0.0/0) pointing to the firewall's private IP ensures that all outbound internet traffic from spoke subnets is forced through the firewall for inspection and control.
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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