- A
Configure an IP restriction on the App Service to allow only the on-premises public IP range.
Why wrong: This would still leave the public endpoint accessible, and the IP range of on-premises might change; also, it does not prevent internet access from other IPs if the restriction is not exclusive.
- B
Configure the App Service with a Private Endpoint.
Private Endpoint provides a private IP for the App Service within your VNet, accessible from on-premises via ExpressRoute.
- C
Configure a Service Endpoint for App Service on the on-premises-connected subnet.
Why wrong: Service Endpoint still uses the public endpoint, and does not block internet traffic; it only provides source IP restriction.
- D
Upload a trusted root certificate to App Service to enforce client certificate authentication for on-premises clients.
Why wrong: Client certificate authentication is an additional layer, but does not block public access; it only authenticates clients.
- E
Set the App Service's 'Public network access' to 'Disabled'.
This blocks all traffic to the public endpoint, ensuring only traffic through the private endpoint is allowed.
Quick Answer
The answer is to set the App Service’s 'Public network access' to 'Disabled', create a Private Endpoint, and restrict network traffic to the ExpressRoute gateway IP range. This configuration works because Private Endpoint assigns the App Service a private IP within your virtual network, allowing on-premises traffic to reach it securely over ExpressRoute via Azure Private Link, while disabling public access ensures the public endpoint is completely unreachable from the internet. On the AZ-500 exam, this scenario tests your understanding of network segmentation and Private Link—a common trap is assuming that simply using a service endpoint is sufficient, but only Private Endpoint fully removes public exposure. Remember the mnemonic “DPE” for Disable public access, Private Endpoint, and ExpressRoute IP restriction to lock down the app to on-premises only.
AZ-500 Secure networking Practice Question
This AZ-500 practice question tests your understanding of secure networking. 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.
Your company uses ExpressRoute to connect on-premises to Azure. You need to ensure that only traffic from the on-premises network can reach a specific Azure App Service, and all other internet traffic to that App Service must be blocked. You also want to avoid exposing the App Service's public endpoint. Which THREE actions should you take?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Configure the App Service with a Private Endpoint.
To restrict access to only on-premises traffic without using the public endpoint, you can use an App Service Environment (ASE) with an internal load balancer, or use Private Endpoint. The combination of Private Endpoint, disabling public access, and restricting access to the ExpressRoute gateway IP range ensures only on-premises traffic can reach the app via Private Link.
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.
- ✗
Configure an IP restriction on the App Service to allow only the on-premises public IP range.
Why it's wrong here
This would still leave the public endpoint accessible, and the IP range of on-premises might change; also, it does not prevent internet access from other IPs if the restriction is not exclusive.
- ✓
Configure the App Service with a Private Endpoint.
Why this is correct
Private Endpoint provides a private IP for the App Service within your VNet, accessible from on-premises via ExpressRoute.
Related concept
CIDR notation defines the prefix length.
- ✗
Configure a Service Endpoint for App Service on the on-premises-connected subnet.
Why it's wrong here
Service Endpoint still uses the public endpoint, and does not block internet traffic; it only provides source IP restriction.
- ✗
Upload a trusted root certificate to App Service to enforce client certificate authentication for on-premises clients.
Why it's wrong here
Client certificate authentication is an additional layer, but does not block public access; it only authenticates clients.
- ✓
Set the App Service's 'Public network access' to 'Disabled'.
Why this is correct
This blocks all traffic to the public endpoint, ensuring only traffic through the private endpoint is allowed.
Related concept
CIDR notation defines the prefix length.
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 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.
What to study next
Got this wrong? Here's your next step.
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 — study guide chapter
Learn the concepts, then practise the questions
- →
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FAQ
Questions learners often ask
What does this AZ-500 question test?
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: Configure the App Service with a Private Endpoint. — To restrict access to only on-premises traffic without using the public endpoint, you can use an App Service Environment (ASE) with an internal load balancer, or use Private Endpoint. The combination of Private Endpoint, disabling public access, and restricting access to the ExpressRoute gateway IP range ensures only on-premises traffic can reach the app via Private Link.
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.
What is the key concept behind this question?
CIDR notation defines the prefix length.
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Last reviewed: Jun 20, 2026
This AZ-500 practice question is part of Courseiva's free Microsoft certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the AZ-500 exam.
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