The answer is that the pod subnet lacks a user-defined route directing traffic to the on-premises network via the VPN gateway. This is because AKS pods, even when using Azure CNI, operate on a distinct IP range that is not automatically propagated across VNet peering; the hub’s VPN gateway only knows about the spoke’s VNet address space, not the pod CIDR. To enable AKS pod routing to on-prem VPN user-defined routes, you must explicitly add a route in the pod subnet’s route table with the VPN gateway’s private IP as the next hop. On the AZ-500 exam, this scenario tests your understanding of how network segmentation and forced tunneling interact with Kubernetes—a common trap is assuming VNet peering alone handles all traffic, or that Azure CNI eliminates the need for UDRs. Remember: peering connects VNets, but pods speak a different language; you must translate with a UDR. Memory tip: “Pods need a path—UDRs are the map through the VPN gate.”
AZ-500 Secure networking Practice Question
This AZ-500 practice question tests your understanding of secure networking. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
You have an Azure Kubernetes Service (AKS) cluster that needs to communicate with an on-premises database over a site-to-site VPN. The AKS cluster is in a spoke VNet, and the VPN gateway is in the hub VNet. You configure VNet peering between hub and spoke. However, pods cannot reach the on-premises database. What is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The pod subnet does not have a route to the on-premises network via the VPN gateway
Option B is correct because AKS pods use a different IP range than the VNet, and user-defined routes (UDRs) are needed to route pod traffic through the VPNgateway. Option A is wrong because peering is configured. Option C is wrong because Azure CNI uses pod IPs from the VNet, but routing still needs UDRs. Option D is wrong because NSGs can block but are not the likely cause here.
Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
The VNet peering is not established correctly
Why it's wrong here
The peering is between hub and spoke, and it's configured.
✗
The network security group on the pod subnet blocks outbound traffic
Why it's wrong here
Unlikely; NSGs allow outbound by default.
✓
The pod subnet does not have a route to the on-premises network via the VPN gateway
Why this is correct
AKS pods need a UDR pointing to the VPNgateway for on-premises access.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Kubenet may cause issues, but the core problem is routing.
Common exam traps
Common exam trap: usable hosts are not the same as total addresses
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Detailed technical explanation
How to think about this question
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
KKey Concepts to Remember
CIDR notation defines the prefix length.
Block size helps identify subnet boundaries.
Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
The required host count determines the smallest suitable subnet.
TExam Day Tips
→Write the block size before choosing the subnet.
→Check whether the question asks for hosts, subnets or a specific address range.
→Do not confuse /24, /25, /26 and /27 host counts.
Key takeaway
Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Real-world example
How this comes up in practice
A healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-500 question in full detail.
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related AZ-500 subnetting questions on CIDR, address ranges, and subnet selection.
Secure networking — This question tests Secure networking — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: The pod subnet does not have a route to the on-premises network via the VPN gateway — Option B is correct because AKS pods use a different IP range than the VNet, and user-defined routes (UDRs) are needed to route pod traffic through the VPN gateway. Option A is wrong because peering is configured. Option C is wrong because Azure CNI uses pod IPs from the VNet, but routing still needs UDRs. Option D is wrong because NSGs can block but are not the likely cause here.
What should I do if I get this AZ-500 question wrong?
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related AZ-500 subnetting questions on CIDR, address ranges, and subnet selection.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
CIDR notation defines the prefix length.
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