- A
VPC Peering connection between subnets.
Why wrong: VPC Peering is for different VPCs.
- B
Internet Gateway
Why wrong: Internet Gateway provides internet access, not internal communication.
- C
Network ACL with inbound rules for the database subnet.
Why wrong: Network ACL is stateless and less secure.
- D
Security Group rules allowing traffic between the security groups.
Security Groups allow stateful traffic between instances.
Question 1,293 of 1,733
How to Allow SAP Application Servers to Communicate with Database Using Security Groups
This PAS-C01 practice question tests your understanding of design of sap workloads on aws. 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 running SAP ERP on AWS. The SAP application servers are in private subnets, and the database is in a separate private subnet. The company needs to allow the application servers to communicate with the database. Which AWS networking component should be configured to allow this traffic?
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
✓
Security Group rules allowing traffic between the security groups.
Security groups act as a virtual firewall for instances, and you can reference another security group as a source in inbound rules. This allows the application servers' security group to be specified as the source for the database security group's inbound rule, enabling traffic between the subnets without exposing the database to the entire subnet. This is the most secure and AWS-recommended method for controlling traffic between instances within the same VPC.
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.
- ✗
VPC Peering connection between subnets.
Why it's wrong here
VPC Peering is for different VPCs.
- ✗
Internet Gateway
Why it's wrong here
Internet Gateway provides internet access, not internal communication.
- ✗
Network ACL with inbound rules for the database subnet.
Why it's wrong here
Network ACL is stateless and less secure.
- ✓
Security Group rules allowing traffic between the security groups.
Why this is correct
Security Groups allow stateful traffic between instances.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Network ACLs (subnet-level, stateless) with Security Groups (instance-level, stateful) and incorrectly choose a Network ACL because they think it is required for inter-subnet traffic, not realizing that security groups can reference each other across subnets within the same VPC.
Detailed technical explanation
How to think about this question
Security group rules are stateful, meaning that if you allow inbound traffic from a source security group, the return traffic is automatically allowed regardless of outbound rules. This is in contrast to Network ACLs, which are stateless and require explicit rules for both inbound and outbound traffic. In a real-world SAP deployment, using security group references allows you to dynamically manage instances (e.g., auto-scaling groups) without updating IP-based rules, as the security group membership is automatically tracked by AWS.
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 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
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FAQ
Questions learners often ask
What does this PAS-C01 question test?
Design of SAP Workloads on AWS — This question tests Design of SAP Workloads on AWS — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Security Group rules allowing traffic between the security groups. — Security groups act as a virtual firewall for instances, and you can reference another security group as a source in inbound rules. This allows the application servers' security group to be specified as the source for the database security group's inbound rule, enabling traffic between the subnets without exposing the database to the entire subnet. This is the most secure and AWS-recommended method for controlling traffic between instances within the same VPC.
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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