The answer is that the instance is using the Xen hypervisor, which does not support Enhanced Networking with ENA. While the r5.4xlarge instance type is built on the Nitro hypervisor, the exhibit reveals the instance is running the Xen PV network driver, meaning it was launched from an older AMI that lacks ENA support. Without the Elastic Network Adapter enabled, the instance cannot achieve the high network throughput required for SAP HANA, directly causing the suboptimal performance. On the AWS Certified SAP on AWS Specialty PAS-C01 exam, this scenario tests your ability to distinguish between hypervisor types and recognize that Nitro-based instances still require ENA-enabled AMIs for full performance. A common trap is assuming all modern instance types automatically have enhanced networking; the key is verifying the driver in use. Memory tip: “Xen driver means no ENA—check your AMI for Nitro’s full potential.”
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. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
Network Topology
An SAP Basis administrator is troubleshooting a performance issue on a SAP HANA database running on an r5.4xlarge instance with dedicated tenancy. The instance is part of a placement group named 'sap-cluster'. The administrator suspects network throughput is suboptimal. Based on the exhibit, what is the MOST likely reason?
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 instance is using the Xen hypervisor, which does not support Enhanced Networking with ENA.
The r5.4xlarge instance uses the Nitro hypervisor, not Xen. However, the exhibit shows that Enhanced Networking is not enabled, and the instance is using the Xen PV network driver. This indicates that the instance was launched with an older Amazon Machine Image (AMI) that does not support the Elastic Network Adapter (ENA). Without ENA, the instance cannot achieve the high network throughput required for SAP HANA, leading to suboptimal performance.
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.
✗
Dedicated tenancy prevents the use of Enhanced Networking.
Why it's wrong here
Dedicated tenancy does not block Enhanced Networking.
✗
The instance type r5.4xlarge does not support Enhanced Networking.
Why it's wrong here
r5 instances support ENA.
✗
The placement group 'sap-cluster' restricts network throughput.
Why it's wrong here
Placement groups improve throughput.
✓
The instance is using the Xen hypervisor, which does not support Enhanced Networking with ENA.
Why this is correct
Xen hypervisor indicates no Enhanced Networking.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
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 may assume all modern instance types automatically have Enhanced Networking enabled, but the actual driver and AMI support determine whether ENA is used, and the exhibit's network driver information reveals the root cause.
Detailed technical explanation
How to think about this question
Enhanced Networking with ENA provides higher packet-per-second (PPS) performance, lower latency, and higher throughput compared to the older Xen PV driver. The r5 instance family is built on the Nitro system, which offloads virtualization functions to dedicated hardware, enabling ENA support. If an instance is launched with an AMI that lacks the ENA driver, it falls back to the Xen PV driver, capping network performance at approximately 10 Gbps instead of the 25 Gbps that the r5.4xlarge can achieve with ENA.
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.
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.
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: The instance is using the Xen hypervisor, which does not support Enhanced Networking with ENA. — The r5.4xlarge instance uses the Nitro hypervisor, not Xen. However, the exhibit shows that Enhanced Networking is not enabled, and the instance is using the Xen PV network driver. This indicates that the instance was launched with an older Amazon Machine Image (AMI) that does not support the Elastic Network Adapter (ENA). Without ENA, the instance cannot achieve the high network throughput required for SAP HANA, leading to suboptimal performance.
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.
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?
Read the scenario before looking for a memorised answer.
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