The answer is Azure NAT Gateway, the correct choice because it provides network address translation for outbound internet connectivity from private subnets without requiring public IP addresses on individual resources. This service uses source network address translation (SNAT) to map private IP addresses to a single public IP or prefix, allowing virtual machines in a private subnet to initiate outbound traffic to the internet while blocking any unsolicited inbound connections. On the Microsoft Azure Fundamentals AZ-900 exam, this question tests your understanding of how Azure handles outbound connectivity for private resources, often appearing as a scenario where you need to enable internet access for VMs without exposing them directly. A common trap is confusing Azure NAT Gateway with Azure Load Balancer or Azure Firewall, but remember: NAT Gateway is purely for outbound SNAT, not for load balancing or filtering. Memory tip: think "NAT = No public IPs on individual resources, just a gateway for outbound."
AZ-900 Describe Azure architecture and services Practice Question
This AZ-900 practice question tests your understanding of describe azure architecture and services. 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.
Which Azure service provides network address translation for outbound internet connectivity from private subnets without public IP addresses on individual resources?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Azure NAT Gateway
Azure NATGateway is the correct service because it is specifically designed to provide outbound internet connectivity for resources in private subnets without requiring public IP addresses on individual VMs. It uses source network address translation (SNAT) to map private IPs to a single public IP or prefix, enabling outbound traffic while preventing inbound connections from the internet.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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 Load Balancer with outbound rules
Why it's wrong here
Load Balancer can provide SNAT for outbound traffic but NATGateway is the dedicated, scalable solution.
✓
Azure NAT Gateway
Why this is correct
NATGateway provides scalable, shared outbound internet connectivity for private subnet resources.
Related concept
Read the scenario before looking for a memorised answer.
✗
Azure Firewall
Why it's wrong here
Azure Firewall can provide outbound connectivity but has additional security features; NATGateway is the basic NAT service.
✗
Azure VPN Gateway
Why it's wrong here
VPNGateway connects networks; NAT Gateway provides outbound internet connectivity for private resources.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Azure NATGateway with Azure Firewall or Load Balancer outbound rules, mistakenly thinking those services are designed for simple outbound NAT when they are actually focused on security filtering or load balancing, respectively.
Detailed technical explanation
How to think about this question
Azure NATGateway operates at the subnet level and uses a pool of public IP addresses or prefixes to perform port address translation (PAT) for outbound connections, supporting up to 64,000 concurrent flows per public IP. It is fully managed and scales automatically, eliminating the need for manual SNAT port exhaustion management. In real-world scenarios, this is critical for workloads like batch processing or data exports where VMs in private subnets must access external APIs or download updates without exposing individual public IPs.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-900 question in full detail.
Describe Azure architecture and services — This question tests Describe Azure architecture and services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Azure NAT Gateway — Azure NAT Gateway is the correct service because it is specifically designed to provide outbound internet connectivity for resources in private subnets without requiring public IP addresses on individual VMs. It uses source network address translation (SNAT) to map private IPs to a single public IP or prefix, enabling outbound traffic while preventing inbound connections from the internet.
What should I do if I get this AZ-900 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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