Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
A company has an Azure virtual network with multiple subnets hosting different application tiers. They need to inspect and filter all outbound traffic from VMs to the internet, and they must be able to allow or deny traffic based on fully qualified domain names (FQDNs). Which Azure networking service should they deploy?
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
Best answer
Azure Firewall.
Correct. Azure Firewall provides application-level filtering based on FQDNs for outbound traffic.
B
Distractor review
Network Security Groups (NSGs).
NSGs can only filter based on IP addresses, ports, and protocols; they do not support FQDN filtering.
C
Distractor review
Azure Application Gateway.
Application Gateway is a layer-7 load balancer for inbound web traffic, not outbound inspection.
D
Distractor review
Azure VPN Gateway.
VPN Gateway creates encrypted tunnels, not traffic inspection or filtering.
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: Azure Firewall. — Azure Firewall supports application rules that can allow or deny outbound traffic based on FQDNs. Network Security Groups filter based on IP addresses and ports only, not FQDNs. Azure Application Gateway handles inbound HTTP/HTTPS traffic. Azure VPN Gateway is for encrypted site-to-site connectivity. Therefore, Azure Firewall is the correct choice for FQDN-based filtering of outbound traffic.
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.
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