- A
Change the placement group to 'spread' to reduce interference.
Why wrong: Spread placement groups place instances on different hardware, increasing latency.
- B
Use larger instance sizes to increase network bandwidth.
Why wrong: Larger instances have higher bandwidth but not necessarily lower latency.
- C
Enable Enhanced Networking (ENA) on all instances in the cluster.
ENA provides higher throughput and lower latency for inter-node communication.
- D
Use EBS-optimized instances to improve storage performance.
Why wrong: EBS optimization improves storage I/O, not network latency.
Question 390 of 1,733
Reducing Network Latency in SAP HANA Scale-Out with Enhanced Networking — AWS SAP on AWS Specialty Explained
This PAS-C01 practice question tests your understanding of technology. 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.
A company is running SAP HANA in a multi-node scale-out configuration on AWS. The cluster uses AWS Placement Groups with the 'cluster' placement strategy. The system is experiencing network latency between nodes. Which change should the company make to reduce latency?
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
✓
Enable Enhanced Networking (ENA) on all instances in the cluster.
Option C is correct because enabling Enhanced Networking (ENA) on all instances reduces network latency and jitter by offloading network processing to dedicated hardware on the Elastic Network Adapter. For SAP HANA scale-out clusters requiring low-latency inter-node communication, ENA provides higher packet-per-second performance and lower latency compared to the default Xen-net driver, directly addressing the latency issue in the cluster placement group.
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.
- ✗
Change the placement group to 'spread' to reduce interference.
Why it's wrong here
Spread placement groups place instances on different hardware, increasing latency.
- ✗
Use larger instance sizes to increase network bandwidth.
Why it's wrong here
Larger instances have higher bandwidth but not necessarily lower latency.
- ✓
Enable Enhanced Networking (ENA) on all instances in the cluster.
Why this is correct
ENA provides higher throughput and lower latency for inter-node communication.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use EBS-optimized instances to improve storage performance.
Why it's wrong here
EBS optimization improves storage I/O, not network latency.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse bandwidth with latency, assuming larger instances or storage optimizations will fix network latency, when the real fix is reducing driver overhead via Enhanced Networking.
Detailed technical explanation
How to think about this question
Enhanced Networking uses SR-IOV (Single Root I/O Virtualization) to bypass the hypervisor's virtual switch, allowing instances to communicate directly with the physical network interface. For SAP HANA scale-out, the cluster placement strategy ensures instances are in the same Availability Zone and close together, but without ENA, the default virtio driver adds per-packet processing overhead that increases latency. In real-world scenarios, enabling ENA can reduce inter-node latency by up to 50% for small packets, which is critical for SAP HANA's internal communication protocols like TCP and RDMA over Converged Ethernet (RoCE).
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
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: Enable Enhanced Networking (ENA) on all instances in the cluster. — Option C is correct because enabling Enhanced Networking (ENA) on all instances reduces network latency and jitter by offloading network processing to dedicated hardware on the Elastic Network Adapter. For SAP HANA scale-out clusters requiring low-latency inter-node communication, ENA provides higher packet-per-second performance and lower latency compared to the default Xen-net driver, directly addressing the latency issue in the cluster placement group.
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.
About these practice questions
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Same concept, more angles
1 more ways this is tested on PAS-C01
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. An SAP HANA system is deployed on AWS with a cluster of EC2 instances. The system requires high network throughput between the nodes for HANA scale-out. Which EC2 networking feature should be used?
medium- A.Use multiple Elastic Network Interfaces (ENIs) per instance.
- ✓ B.Enable Elastic Network Adapter (ENA) support on the instances.
- C.Use the Intel 82599 VF (ixgbevf) driver for enhanced networking.
- D.Place all nodes in a cluster placement group.
Why B: For SAP HANA scale-out clusters requiring high network throughput between EC2 instances, the correct feature is Elastic Network Adapter (ENA) support. ENA is a custom network interface optimized for high-throughput and low-latency packet processing, providing up to 100 Gbps of network bandwidth on supported instance types. This directly meets the performance demands of HANA's inter-node communication.
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Last reviewed: Jul 4, 2026
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