Quick Answer
The correct choice is the Basic SKU because it is the only Azure VPN Gateway SKU that supports IKEv1, which is required for compatibility with legacy on-premises VPN devices that do not support IKEv2. While the VpnGw1, VpnGw2, and VpnGw3 SKUs offer higher performance and more features, they exclusively support IKEv2, making them incompatible with older hardware. On the Microsoft Azure Security Engineer Associate AZ-500 exam, this question tests your understanding of gateway SKU limitations and the importance of protocol version matching in hybrid connectivity scenarios. A common trap is assuming all SKUs support both IKE versions, but the Basic SKU is deliberately kept for backward compatibility with legacy devices. For a quick memory tip, remember: “Basic brings back IKEv1” — when you see a legacy device that can’t speak IKEv2, the Basic SKU is your only bridge.
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 has an Azure subscription with multiple VNets. You need to securely connect an on-premises data center to Azure using a site-to-site VPN. The on-premises VPN device does not support IKEv2. Which VPN gateway SKU should you select to ensure compatibility?
VpnGw2
Why wrong: VpnGw2 only supports IKEv2.
VpnGw1
Why wrong: VpnGw1 only supports IKEv2.
Basic
Basic SKU supports IKEv1, which is compatible with older VPN devices.
VpnGw3
Why wrong: VpnGw3 only supports IKEv2.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Basic
Option A is correct because the Basic SKU supports IKEv1, which is required for compatibility with devices that do not support IKEv2. Options B, C, and D are wrong because VpnGw1, VpnGw2, and VpnGw3 only support IKEv2.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
VpnGw2
Why it's wrong here
VpnGw2 only supports IKEv2.
VpnGw1
Why it's wrong here
VpnGw1 only supports IKEv2.
Basic
VpnGw3
Why it's wrong here
VpnGw3 only supports IKEv2.
Common exam traps
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
A healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
What to study next
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related AZ-500 NAT questions on configuration and troubleshooting.
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FAQ
Secure networking — This question tests Secure networking — Static NAT maps one inside address to one outside address..
The correct answer is: Basic — Option A is correct because the Basic SKU supports IKEv1, which is required for compatibility with devices that do not support IKEv2. Options B, C, and D are wrong because VpnGw1, VpnGw2, and VpnGw3 only support IKEv2.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related AZ-500 NAT questions on configuration and troubleshooting.
Static NAT maps one inside address to one outside address.
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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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