This NSE4 practice question tests your understanding of authentication and vpn. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
What is the primary advantage of using IKEv2 over IKEv1 for IPsec VPN?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "primary"
Why it matters: Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
IKEv2 requires less CPU resources
Why wrong: Both versions have similar CPU requirements.
IKEv2 provides built-in NAT traversal
Why wrong: IKEv1 has NAT traversal as an extension.
IKEv2 supports MOBIKE to handle IP address changes
MOBIKE is unique to IKEv2 and allows the VPN to continue after IP change.
IKEv2 supports only certificate authentication
Why wrong: IKEv1 also supports certificates.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
IKEv2 supports MOBIKE to handle IP address changes
IKEv2 is more resilient to network changes and supports MOBIKE (Mobility and Multihoming), which allows the VPN to survive IP address changes during a session, e.g., when a mobile client switches from Wi-Fi to cellular.
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.
IKEv2 requires less CPU resources
Why it's wrong here
Both versions have similar CPU requirements.
IKEv2 provides built-in NAT traversal
Why it's wrong here
IKEv1 has NAT traversal as an extension.
IKEv2 supports MOBIKE to handle IP address changes
IKEv2 supports only certificate authentication
Why it's wrong here
IKEv1 also supports certificates.
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.
Trap categories for this question
Similar concept trap
Both versions have similar CPU requirements.
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 small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
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 NSE4 NAT questions on configuration and troubleshooting.
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FAQ
Authentication and VPN — This question tests Authentication and VPN — Static NAT maps one inside address to one outside address..
The correct answer is: IKEv2 supports MOBIKE to handle IP address changes — IKEv2 is more resilient to network changes and supports MOBIKE (Mobility and Multihoming), which allows the VPN to survive IP address changes during a session, e.g., when a mobile client switches from Wi-Fi to cellular.
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 NSE4 NAT questions on configuration and troubleshooting.
Yes — watch for: "primary". Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
Static NAT maps one inside address to one outside address.
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Last reviewed: Jun 21, 2026
This NSE4 practice question is part of Courseiva's free Fortinet 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 NSE4 exam.
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