The correct approach is to create a new EC2 instance with the patched kernel, associate the Elastic IP to the new instance, and terminate the old one, as this implements a blue/green deployment for the SAP ASCS kernel patch. This method minimizes downtime because the new instance is fully tested and ready before traffic is switched, and the Elastic IP reassignment is nearly instantaneous, avoiding any interruption to the SAP system’s floating IP requirement. On the AWS Certified SAP on AWS Specialty PAS-C01 exam, this scenario tests your understanding of how to apply an SAP ASCS kernel patch in a Multi-AZ deployment while preserving high availability; a common trap is assuming you can simply stop the EC2 instance or use Auto Scaling rolling updates, but those cause downtime or are incompatible with a single ASCS instance. Remember the memory tip: for ASCS patching, think “swap the IP, not the instance state”—blue/green avoids the red of downtime.
PAS-C01 Technology Practice Question
This PAS-C01 practice question tests your understanding of technology. 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 Basis administrator needs to apply an SAP kernel patch to the SAP Central Services (ASCS) instance running on an EC2 instance in a Multi-AZ deployment. The ASCS instance is configured with a floating IP address using Elastic IP. The administrator wants to minimize downtime during the patching process. Which approach should the administrator take?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "minimum / minimize"
Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create a new EC2 instance with the patched kernel, associate the Elastic IP to the new instance, and terminate the old one.
Option A is correct because a blue/green deployment allows testing the patch on a new instance and then switching traffic with minimal downtime. Option B is wrong because stopping the instance causes downtime. Option C is wrong because modifying the launch configuration and performing a rolling update is for Auto Scaling groups, not for a single instance. Option D is wrong because adding the instance to an ALB would require application changes and may not be compatible with ASCS floating IP.
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.
✗
Stop the ASCS instance, apply the patch, and start the instance.
Why it's wrong here
Causes downtime during the stop/start process.
✓
Create a new EC2 instance with the patched kernel, associate the Elastic IP to the new instance, and terminate the old one.
Why this is correct
Minimizes downtime by quickly switching the Elastic IP.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
✗
Add the ASCS instance to an Application Load Balancer and then perform the patch.
Why it's wrong here
ASCS typically uses a floating IP, not an ALB.
✗
Use an Auto Scaling group with a rolling update to apply the patch.
Why it's wrong here
Auto Scaling with rolling updates is for stateless applications, not for ASCS with floating IP.
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.
Technology — This question tests Technology — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Create a new EC2 instance with the patched kernel, associate the Elastic IP to the new instance, and terminate the old one. — Option A is correct because a blue/green deployment allows testing the patch on a new instance and then switching traffic with minimal downtime. Option B is wrong because stopping the instance causes downtime. Option C is wrong because modifying the launch configuration and performing a rolling update is for Auto Scaling groups, not for a single instance. Option D is wrong because adding the instance to an ALB would require application changes and may not be compatible with ASCS floating IP.
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: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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