- A
AWS Direct Connect
Why wrong: Direct Connect is a dedicated network connection, but it is not the quickest or most cost-effective for simple LDAP traffic.
- B
VPC Peering
Why wrong: VPC Peering connects VPCs within AWS, not to on-premises.
- C
AWS Site-to-Site VPN
Site-to-Site VPN provides a secure IPsec tunnel over the internet.
- D
AWS Transit Gateway
Why wrong: Transit Gateway is a network transit hub that requires VPN or Direct Connect attachments.
Question 431 of 1,733
PAS-C01 Technology Practice Question
This PAS-C01 practice question tests your understanding of technology. 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 is migrating its SAP ERP system to AWS and needs to ensure that the SAP application can communicate with the corporate LDAP server for authentication. The LDAP server is on-premises. Which AWS service should be used to establish a secure connection?
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
✓
AWS Site-to-Site VPN
AWS Site-to-Site VPN creates an encrypted tunnel over the public internet using IPsec, enabling secure communication between the SAP application in the VPC and the on-premises LDAP server. This is the most straightforward and cost-effective option for establishing a secure connection when a dedicated physical link is not required.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
AWS Direct Connect
Why it's wrong here
Direct Connect is a dedicated network connection, but it is not the quickest or most cost-effective for simple LDAP traffic.
- ✗
VPC Peering
Why it's wrong here
VPC Peering connects VPCs within AWS, not to on-premises.
- ✓
AWS Site-to-Site VPN
- ✗
AWS Transit Gateway
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse VPC Peering with on-premises connectivity, not realizing that VPC Peering only works between VPCs within AWS and cannot extend to an on-premises network.
Detailed technical explanation
How to think about this question
The Site-to-Site VPN uses IPsec (IKEv1 or IKEv2) to encrypt traffic between the VPC's virtual private gateway and the on-premises customer gateway device. For LDAP authentication, the VPN ensures that credentials and directory queries are protected from interception, which is critical because LDAP transmits data in cleartext by default unless LDAPS (port 636) is used. In a real-world scenario, if the LDAP server only supports plain LDAP (port 389), the VPN provides the necessary encryption layer.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Questions learners often ask
What does this PAS-C01 question test?
Technology — This question tests Technology — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: AWS Site-to-Site VPN — AWS Site-to-Site VPN creates an encrypted tunnel over the public internet using IPsec, enabling secure communication between the SAP application in the VPC and the on-premises LDAP server. This is the most straightforward and cost-effective option for establishing a secure connection when a dedicated physical link is not required.
What should I do if I get this PAS-C01 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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