The correct answer involves three specific actions: configuring the VPC for dual-stack mode, assigning both IPv4 and IPv6 addresses to the EC2 instances, and updating the security groups to allow traffic for both IP versions. This is because an SAP dual-stack IPv4 IPv6 environment requires the underlying network infrastructure to natively route both address families, and the EC2 instances must be provisioned with both an IPv4 and an IPv6 address to communicate over either protocol. Security groups act as virtual firewalls and must explicitly permit inbound and outbound rules for both IP versions; otherwise, traffic on one stack will be silently dropped. On the AWS Certified SAP on AWS Specialty PAS-C01 exam, this question tests your understanding of VPC networking fundamentals as they apply to SAP migrations, often appearing as a scenario where you must distinguish mandatory dual-stack components from optional outbound-only gateways like NAT or egress-only Internet Gateways. A common trap is assuming a NAT Gateway or an Egress-Only Internet Gateway is required for dual-stack, but they are only needed for specific outbound-only scenarios. Memory tip: think “VPC, Instance, Security” as the three pillars of dual-stack enablement.
PAS-C01 Migration Practice Question
This PAS-C01 practice question tests your understanding of migration. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 migrating an SAP system from on-premises to AWS. The current system uses a dual-stack (IPv4 and IPv6) network. The company wants to ensure that the SAP system on AWS supports both IP versions. Which THREE actions should the company take? (Choose 3.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Update security group rules to allow both IPv4 and IPv6 traffic
To support dual-stack, assign IPv4 and IPv6 addresses to EC2 instances, configure the VPC for dual-stack, and ensure the security groups allow both IP versions. Option A (Assign both addresses) is correct. Option B (VPC dual-stack) is correct. Option C (Update security groups) is correct. Option D (NATGateway) is for outbound IPv4, not required. Option E (Egress-only Internet Gateway) is for IPv6 outbound only, but not mandatory for dual-stack.
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.
✓
Update security group rules to allow both IPv4 and IPv6 traffic
Why this is correct
Security groups must permit traffic for both IP versions.
Related concept
Static NAT maps one inside address to one outside address.
✓
Assign both IPv4 and IPv6 addresses to the EC2 instances
Why this is correct
Instances need both IP addresses to support dual-stack.
Related concept
Static NAT maps one inside address to one outside address.
✗
Create an Egress-Only Internet Gateway
Why it's wrong here
Egress-Only IG is for outbound IPv6 but not required for dual-stack support.
✓
Configure the VPC to support dual-stack mode
Why this is correct
VPC must be dual-stack to route both IP versions.
Related concept
Static NAT maps one inside address to one outside address.
✗
Set up a NAT Gateway for IPv6 traffic
Why it's wrong here
NATGateway is for IPv4 only; IPv6 uses Egress-Only Internet Gateway.
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
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
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 PAS-C01 NAT questions on configuration and troubleshooting.
Migration — This question tests Migration — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Update security group rules to allow both IPv4 and IPv6 traffic — To support dual-stack, assign IPv4 and IPv6 addresses to EC2 instances, configure the VPC for dual-stack, and ensure the security groups allow both IP versions. Option A (Assign both addresses) is correct. Option B (VPC dual-stack) is correct. Option C (Update security groups) is correct. Option D (NAT Gateway) is for outbound IPv4, not required. Option E (Egress-only Internet Gateway) is for IPv6 outbound only, but not mandatory for dual-stack.
What should I do if I get this PAS-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 PAS-C01 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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