This ANS-C01 practice question tests your understanding of network implementation. 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.
A company is setting up a Site-to-Site VPN connection to AWS. The customer gateway device is behind a NAT device that performs address translation. Which tunnel option must be enabled to ensure the VPN tunnel establishes correctly?
Perfect Forward Secrecy (PFS)
Why wrong: A security feature for keying, not related to NAT.
NAT Traversal (NAT-T)
Required to encapsulate IPsec in UDP to pass through NAT.
Dead Peer Detection (DPD)
Why wrong: Used to detect if the peer is alive, not for NAT.
IKEv2
Why wrong: A version of IKE, but not specifically for NAT traversal.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
NAT Traversal (NAT-T)
Option A is correct because NAT traversal (NAT-T) is required when the customer gateway is behind a NAT device to encapsulate IPsec packets in UDP. Option B is wrong because dead peer detection is for monitoring, not for NAT. Option C is wrong because perfect forward secrecy is a security feature. Option D is wrong because IKEv2 is a protocol version, not specifically for NAT traversal.
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.
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 cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
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 ANS-C01 NAT questions on configuration and troubleshooting.
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FAQ
Network Implementation — This question tests Network Implementation — Static NAT maps one inside address to one outside address..
The correct answer is: NAT Traversal (NAT-T) — Option A is correct because NAT traversal (NAT-T) is required when the customer gateway is behind a NAT device to encapsulate IPsec packets in UDP. Option B is wrong because dead peer detection is for monitoring, not for NAT. Option C is wrong because perfect forward secrecy is a security feature. Option D is wrong because IKEv2 is a protocol version, not specifically for NAT traversal.
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 ANS-C01 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
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