The answer is that the secondary IP address is not automatically re-attached after an instance stop/start. This occurs because secondary IPs are tied to the Elastic Network Interface (ENI) but are only persistent if explicitly configured to remain attached at the ENI level; a simple reboot or stop/start action does not preserve them by default. On the AWS Certified SAP on AWS Specialty PAS-C01 exam, this concept tests your understanding of how EC2 networking behaves during lifecycle events, often appearing as a trap where candidates confuse Elastic IPs (which do persist) with secondary private IPs. A common mistake is assuming security groups or ENI deletion cause the loss, but the real culprit is the lack of automatic re-attachment. Memory tip: think of secondary IPs as temporary guests—they leave when the instance restarts unless you give them a permanent reservation on the ENI.
PAS-C01 Design of SAP Workloads on AWS Practice Question
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.
An SAP system uses a secondary IP address for the SAP application. After an instance reboot, the secondary IP address is no longer attached. What is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The secondary IP address is not automatically re-attached after instance stop/start
Secondary IP addresses are not automatically re-attached after a stop/start unless configured in the ENI. Option A is wrong because Elastic IPs are not automatically detached. Option C is wrong because security groups don't affect IP addresses. Option D is wrong because the ENI itself is not deleted unless terminated.
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.
✗
The Elastic IP address was not associated with the instance
The secondary IP address is not automatically re-attached after instance stop/start
Why this is correct
Secondary IPs are not persistent across stop/start; they must be re-attached or use an ENI.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
✗
The security group removed the IP address
Why it's wrong here
Security groups filter traffic but don't manage IP assignment.
✗
The Elastic Network Interface (ENI) was deleted
Why it's wrong here
ENIs persist unless explicitly deleted.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
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.
Design of SAP Workloads on AWS — This question tests Design of SAP Workloads on AWS — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: The secondary IP address is not automatically re-attached after instance stop/start — Secondary IP addresses are not automatically re-attached after a stop/start unless configured in the ENI. Option A is wrong because Elastic IPs are not automatically detached. Option C is wrong because security groups don't affect IP addresses. Option D is wrong because the ENI itself is not deleted unless terminated.
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.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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