The correct answer is to configure firewall rules with 'Allow access to Azure services' enabled and specific IP rules. This works because Azure Database for MySQL uses a built-in firewall that evaluates connection requests against two layers: a master switch that permits traffic from any Azure service (including other PaaS resources) and granular IP address rules for client machines. On the AZ-500 exam, this tests your understanding of network access controls for Azure PaaS databases, often appearing in scenarios where you must distinguish between direct firewall rules and more complex networking features like VNet service endpoints or NSGs. A common trap is confusing Azure AD authentication with network-level access—remember that identity controls who, not where. Memory tip: think of the firewall as a bouncer checking two lists—the VIP list (Azure services) and the guest list (specific IPs).
AZ-500 Secure compute, storage, and databases Practice Question
This AZ-500 practice question tests your understanding of secure compute, storage, and databases. 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.
Your organization is using Azure Database for MySQL. You need to ensure that only traffic from Azure services and specific client IP addresses can connect to the database. What should you configure?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Firewall rules with 'Allow access to Azure services' enabled and specific IP rules
Option C is correct because Azure Database for MySQL uses firewall rules to allow specific IP ranges and an option to allow Azure services. Option A is wrong because NSGs are for virtual networks, not Azure PaaS databases directly. Option B is wrong because Azure AD authentication is for identity, not network access. Option D is wrong because VNet service endpoints are a more complex configuration, and the question doesn't specify a VNet.
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.
✗
Azure Active Directory authentication
Why it's wrong here
AAD authentication controls access based on identity, not network.
✗
Virtual Network service endpoints
Why it's wrong here
Service endpoints are used for VNet integration, but the question does not mention VNet.
✗
Network Security Group (NSG) rules on the subnet
Why it's wrong here
NSGs apply to VMs, not directly to Azure Database for MySQL.
✓
Firewall rules with 'Allow access to Azure services' enabled and specific IP rules
Why this is correct
Firewall rules control network access to the database.
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.
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 compute, storage, and databases — This question tests Secure compute, storage, and databases — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: Firewall rules with 'Allow access to Azure services' enabled and specific IP rules — Option C is correct because Azure Database for MySQL uses firewall rules to allow specific IP ranges and an option to allow Azure services. Option A is wrong because NSGs are for virtual networks, not Azure PaaS databases directly. Option B is wrong because Azure AD authentication is for identity, not network access. Option D is wrong because VNet service endpoints are a more complex configuration, and the question doesn't specify a VNet.
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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