The answer is one route table. This is the minimum number required because a single user-defined route (UDR) can be applied to the Frontend subnet, specifying the network virtual appliance’s private IP as the next hop for all traffic destined to the Backend subnet; the NVA then handles inspection and forwards the traffic onward, so no additional route table is needed for the Backend subnet unless asymmetric routing is a concern. On the Microsoft Azure Security Engineer Associate AZ-500 exam, this scenario tests your understanding of UDRs and NVA traffic steering, often appearing as a trick question where candidates mistakenly think two route tables are required—one for each subnet. The key insight is that traffic steering only needs a route on the source subnet to force traffic through the NVA; the return path is handled by the NVA’s own routing unless you explicitly configure a separate UDR for symmetric flows. Memory tip: “One route, one source—steer traffic through the appliance course.”
AZ-500 Secure networking Practice Question
This AZ-500 practice question tests your understanding of secure networking. 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 has an Azure virtual network with two subnets: Frontend and Backend. They deploy a network virtual appliance (NVA) in a subnet named NVA_Subnet. They want to route all traffic from the Frontend subnet to the Backend subnet through the NVA for inspection. What is the minimum number of route tables required to achieve this traffic steering?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "minimum / minimize"
Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
One route table on the Frontend subnet with a route for the Backend subnet address space pointing to the NVA is sufficient to steer traffic from Frontend to Backend through the NVA.
B
2
Why wrong: Two route tables are required only if you need symmetric routing (both directions through the NVA). The question specifies traffic from Frontend to Backend, so one route table is enough.
C
3
Why wrong: Three route tables are unnecessary. Only one or two are needed depending on requirements.
D
4
Why wrong: Four route tables are not required for this simple traffic steering scenario.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
1
A single route table can be associated with the Frontend subnet and configured with a user-defined route (UDR) that has the NVA's private IP as the next hop for traffic destined to the Backend subnet. This ensures all traffic from Frontend to Backend is forwarded to the NVA for inspection. No additional route tables are needed because the NVA itself handles the routing decision after inspection, and the Backend subnet does not require a specific route to return traffic unless asymmetric routing is a concern.
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.
✓
1
Why this is correct
One route table on the Frontend subnet with a route for the Backend subnet address space pointing to the NVA is sufficient to steer traffic from Frontend to Backend through the NVA.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
2
Why it's wrong here
Two route tables are required only if you need symmetric routing (both directions through the NVA). The question specifies traffic from Frontend to Backend, so one route table is enough.
✗
3
Why it's wrong here
Three route tables are unnecessary. Only one or two are needed depending on requirements.
✗
4
Why it's wrong here
Four route tables are not required for this simple traffic steering scenario.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume each subnet requires its own route table, or that the NVA subnet itself needs a custom route, but Azure's default routing handles the return path unless asymmetric routing is explicitly required.
Trap categories for this question
Scenario analysis trap
Four route tables are not required for this simple traffic steering scenario.
Detailed technical explanation
How to think about this question
Under the hood, Azure uses system routes for VNet peering and subnet-to-subnet traffic, but a user-defined route (UDR) with a next hop of 'Virtual appliance' overrides this for the Frontend subnet. The NVA must have IP forwarding enabled on its network interface to accept traffic not destined to itself, and it must be configured to route the inspected traffic to the Backend subnet. In a real-world scenario, if the NVA also needs to inspect return traffic, you would need a second route table on the Backend subnet to avoid asymmetric routing, but the question explicitly asks only for traffic steering from Frontend to Backend.
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-500 question in full detail.
Secure networking — This question tests Secure networking — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: 1 — A single route table can be associated with the Frontend subnet and configured with a user-defined route (UDR) that has the NVA's private IP as the next hop for traffic destined to the Backend subnet. This ensures all traffic from Frontend to Backend is forwarded to the NVA for inspection. No additional route tables are needed because the NVA itself handles the routing decision after inspection, and the Backend subnet does not require a specific route to return traffic unless asymmetric routing is a concern.
What should I do if I get this AZ-500 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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