- A
Deploy SAProuter on an EC2 instance with an Elastic IP address
EC2 with Elastic IP provides a stable endpoint and allows existing SAProuter rules to be reused.
- B
Use an AWS NAT Gateway to route traffic
Why wrong: NAT Gateway is for outbound traffic, not for SAProuter's specific routing.
- C
Establish an AWS Site-to-Site VPN connection
Why wrong: VPN is for network connectivity, not for SAProuter's application-level routing.
- D
Use an AWS Application Load Balancer
Why wrong: ALB does not support SAProuter protocols (saprfc).
Question 1,408 of 1,733
PAS-C01 Migration Practice Question
This PAS-C01 practice question tests your understanding of migration. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 NetWeaver system to AWS. The system uses SAProuter for secure network communication. What is the recommended approach to preserve the SAProuter functionality during the migration?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Deploy SAProuter on an EC2 instance with an Elastic IP address
The correct answer is Option A. Deploying SAProuter on an EC2 instance with an Elastic IP address preserves the existing SAProuter configuration and ensures a stable endpoint that can be referenced in firewall rules and SAP routing tables. Option B (AWS NAT Gateway) is incorrect because a NAT Gateway is used for outbound internet traffic from private subnets and does not provide a persistent inbound endpoint for SAProuter connections. Option C (AWS Site-to-Site VPN) is incorrect because while a VPN provides secure connectivity between on-premises and AWS, it does not replace the need for SAProuter, which operates at the application layer. Option D (Application Load Balancer) is incorrect because an ALB is designed for HTTP/HTTPS traffic and cannot handle the proprietary protocol used by SAProuter.
Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Deploy SAProuter on an EC2 instance with an Elastic IP address
Why this is correct
EC2 with Elastic IP provides a stable endpoint and allows existing SAProuter rules to be reused.
Related concept
CIDR notation defines the prefix length.
- ✗
Use an AWS NAT Gateway to route traffic
- ✗
Establish an AWS Site-to-Site VPN connection
Why it's wrong here
VPN is for network connectivity, not for SAProuter's application-level routing.
- ✗
Use an AWS Application Load Balancer
Why it's wrong here
ALB does not support SAProuter protocols (saprfc).
Common exam traps
Common exam trap: usable hosts are not the same as total addresses
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Detailed technical explanation
How to think about this question
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
KKey Concepts to Remember
- CIDR notation defines the prefix length.
- Block size helps identify subnet boundaries.
- Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
- The required host count determines the smallest suitable subnet.
TExam Day Tips
- Write the block size before choosing the subnet.
- Check whether the question asks for hosts, subnets or a specific address range.
- Do not confuse /24, /25, /26 and /27 host counts.
Key takeaway
Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
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.
Visual reference
Quick reference
VPN Protocol Comparison
| Protocol | Port | Encryption | Authentication | Use Case |
|---|---|---|---|---|
| IKEv2 / IPsec | UDP 500 / 4500 | AES-256 | Certificates / PSK | Site-to-site & remote access |
| SSL / TLS VPN | TCP 443 | TLS 1.3 | Certificates / MFA | Clientless remote access |
| L2TP / IPsec | UDP 1701 | AES (IPsec) | PSK / Certificates | Legacy remote access |
| WireGuard | UDP 51820 | ChaCha20 | Public keys | Modern high-performance VPN |
| PPTP | TCP 1723 | MPPE (weak) | MS-CHAPv2 | Legacy — avoid in production |
PPTP is considered insecure. IKEv2/IPsec and SSL VPN are the current recommended options.
What to study next
Got this wrong? Here's your next step.
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related PAS-C01 subnetting questions on CIDR, address ranges, and subnet selection.
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FAQ
Questions learners often ask
What does this PAS-C01 question test?
Migration — This question tests Migration — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: Deploy SAProuter on an EC2 instance with an Elastic IP address — The correct answer is Option A. Deploying SAProuter on an EC2 instance with an Elastic IP address preserves the existing SAProuter configuration and ensures a stable endpoint that can be referenced in firewall rules and SAP routing tables. Option B (AWS NAT Gateway) is incorrect because a NAT Gateway is used for outbound internet traffic from private subnets and does not provide a persistent inbound endpoint for SAProuter connections. Option C (AWS Site-to-Site VPN) is incorrect because while a VPN provides secure connectivity between on-premises and AWS, it does not replace the need for SAProuter, which operates at the application layer. Option D (Application Load Balancer) is incorrect because an ALB is designed for HTTP/HTTPS traffic and cannot handle the proprietary protocol used by SAProuter.
What should I do if I get this PAS-C01 question wrong?
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related PAS-C01 subnetting questions on CIDR, address ranges, and subnet selection.
What is the key concept behind this question?
CIDR notation defines the prefix length.
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Last reviewed: Jun 20, 2026
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