The correct answer is to create a VPN connection with two tunnels, each terminating on a different virtual private gateway in the same VPC. This design achieves high availability AWS Site-to-Site VPN by eliminating a single point of failure at the AWS endpoint; if one virtual private gateway fails, traffic automatically fails over to the second tunnel on the other gateway, while both tunnels maintain full IPsec encryption for the on-premises connection. On the AWS Certified Advanced Networking Specialty ANS-C01 exam, this question tests your understanding that high availability requires redundancy at both the customer gateway and the AWS side—a common trap is assuming two tunnels to the same virtual private gateway are sufficient, but that still shares a single endpoint. The key memory tip is “two gateways, not just two tunnels,” ensuring you distinguish between endpoint redundancy and mere tunnel duplication.
ANS-C01 Network Security, Compliance and Governance Practice Question
This ANS-C01 practice question tests your understanding of network security, compliance and governance. 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.
A company wants to securely connect an on-premises data center to a VPC using AWS Site-to-Site VPN. The security team requires that all traffic between the on-premises network and the VPC be encrypted and that the VPN tunnel be highly available. Which design BEST meets these requirements?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create a VPN connection with two tunnels, each terminating on a different virtual private gateway in the same VPC.
Option D is correct because using two VPN tunnels to two different AWS endpoints provides high availability and encryption. Option A is wrong because a single VPN tunnel is not highly available. Option B is wrong because Direct Connect does not provide encryption by default. Option C is wrong because two tunnels to the same endpoint still has a single point of failure.
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
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Use AWS Direct Connect with a private VIF and enable encryption on the connection.
Why it's wrong here
Direct Connect does not inherently encrypt traffic.
✗
Create a single VPN tunnel with a virtual private gateway and enable encryption.
Why it's wrong here
Single tunnel lacks high availability.
✗
Create two VPN tunnels to the same virtual private gateway for redundancy.
Why it's wrong here
Both tunnels terminate on the same gateway, creating a single point of failure.
✓
Create a VPN connection with two tunnels, each terminating on a different virtual private gateway in the same VPC.
Why this is correct
Provides encryption and high availability via diverse endpoints.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
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
How to think about this question
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.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
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
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.
What to study next
Got this wrong? Here's your next step.
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.
Network Security, Compliance and Governance — This question tests Network Security, Compliance and Governance — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Create a VPN connection with two tunnels, each terminating on a different virtual private gateway in the same VPC. — Option D is correct because using two VPN tunnels to two different AWS endpoints provides high availability and encryption. Option A is wrong because a single VPN tunnel is not highly available. Option B is wrong because Direct Connect does not provide encryption by default. Option C is wrong because two tunnels to the same endpoint still has a single point of failure.
What should I do if I get this ANS-C01 question wrong?
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.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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