Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
A virtual network has a Frontend subnet (web servers) and a Backend subnet (Azure SQL Database). The security team requires that no internet traffic can reach the Backend subnet directly, but the Frontend subnet must be able to communicate with the Backend subnet on port 1433. Which solution should they implement?
Answer choices
Why each option matters
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
Distractor review
Azure Firewall with a routing table
Azure Firewall is a managed firewall but for subnet-level filtering, NSGs are simpler and more appropriate for this scenario.
B
Best answer
Network Security Groups (NSGs)
NSGs provide stateful filtering at the subnet or NIC level, allowing you to explicitly allow/deny traffic from specific sources.
C
Distractor review
Service Endpoints
Service Endpoints secure connectivity to Azure PaaS services but do not filter all network traffic.
D
Distractor review
Virtual Network Peering
VNet peering connects VNets, it does not filter traffic.
Common exam trap
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.
Technical deep dive
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.
Related practice questions
Related AZ-500 practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
More questions from this exam
Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.
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FAQ
Questions learners often ask
What does this AZ-500 question test?
CIDR notation defines the prefix length.
What is the correct answer to this question?
The correct answer is: Network Security Groups (NSGs) — Network Security Groups (NSGs) can be applied to subnets to filter traffic. You can create an NSG for the Backend subnet that denies all inbound traffic from the internet and allows inbound traffic only from the Frontend subnet on port 1433.
What should I do if I get this AZ-500 question wrong?
Then try more questions from the same exam bank and focus on understanding why the wrong options are tempting.
Discussion
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