- A
VPC endpoint
Why wrong: VPC endpoints are for private connectivity to AWS services, not for instance IPs.
- B
Elastic Network Interface (ENI) with a primary private IP
An ENI retains its private IP address even when detached or attached to a different instance.
- C
Secondary private IP address on the primary network interface
Why wrong: The secondary IP is tied to the ENI but can change if the ENI is recreated.
- D
Elastic IP address
Why wrong: Elastic IP is a public IP address, not private.
Question 772 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.
An administrator is setting up an SAP system on AWS and needs to assign a static private IP address to the SAP application server. Which AWS resource should be used to ensure the private IP address remains the same even after an instance stop/start?
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
✓
Elastic Network Interface (ENI) with a primary private IP
An Elastic Network Interface (ENI) with a primary private IP address retains its private IP address across instance stop/start cycles because the ENI is a separate resource that persists independently of the instance lifecycle. When you attach an ENI to an SAP application server, the primary private IP (assigned from the VPC subnet) remains fixed even after the instance is stopped and started, ensuring consistent network addressing for SAP communication.
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 endpoint
Why it's wrong here
VPC endpoints are for private connectivity to AWS services, not for instance IPs.
- ✓
Elastic Network Interface (ENI) with a primary private IP
Why this is correct
An ENI retains its private IP address even when detached or attached to a different instance.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Secondary private IP address on the primary network interface
Why it's wrong here
The secondary IP is tied to the ENI but can change if the ENI is recreated.
- ✗
Elastic IP address
Why it's wrong here
Elastic IP is a public IP address, not private.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse the persistence of an Elastic IP (which is a public IP) with the need for a static private IP, or they mistakenly think that secondary private IPs on the primary ENI survive instance stop/start, when in fact only an ENI as a standalone resource guarantees private IP persistence.
Detailed technical explanation
How to think about this question
Under the hood, an ENI is a virtual network card that includes attributes such as a primary private IPv4 address, one or more secondary private IPv4 addresses, Elastic IP addresses, and security groups. When you stop an EC2 instance, the underlying host may change, but the ENI (and its primary private IP) is preserved in the VPC subnet and reattached to the new host upon start. This behavior is critical for SAP systems that rely on stable hostnames and IP addresses for kernel parameter tables (e.g., /etc/hosts) and SAP profile parameters like SAPLOCALHOST or rdisp/mshost.
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
What to study next
Got this wrong? Here's your next step.
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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: Elastic Network Interface (ENI) with a primary private IP — An Elastic Network Interface (ENI) with a primary private IP address retains its private IP address across instance stop/start cycles because the ENI is a separate resource that persists independently of the instance lifecycle. When you attach an ENI to an SAP application server, the primary private IP (assigned from the VPC subnet) remains fixed even after the instance is stopped and started, ensuring consistent network addressing for SAP communication.
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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