PAS-C01 Technology Practice Question
An SAP system on AWS sends large amounts of batch data via RFC calls between two EC2 instances in the same VPC. The application team reports high network latency. Which configuration change would most effectively reduce latency?
⚠ Common exam trap
Many exam-takers confuse high-throughput features (ENA, EFA) with low-latency features, or assume Elastic IPs reduce network distance, when the key is physical proximity via a cluster placement group.
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
✓
Place both EC2 instances in the same cluster placement group.
Cluster placement groups provide low-latency, high-throughput network connectivity by placing instances in a single Availability Zone within a logical group, ensuring they are in close physical proximity. For SAP RFC batch data transfer between two EC2 instances in the same VPC, this reduces network hops and latency significantly compared to instances placed in different racks or AZs.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Assign Elastic IP addresses to both instances.
Why it's wrong here
Elastic IPs do not reduce latency within the VPC.
- ✗
Enable Elastic Network Adapter (ENA) on both instances.
Why it's wrong here
ENA is already a best practice; it may not be the root cause.
- ✓
Place both EC2 instances in the same cluster placement group.
Why this is correct
A cluster placement group provides low-latency, single-rack, non-blocking 10 Gbps network connectivity between instances, directly addressing the high network latency reported for batch RFC calls. This configuration satisfies the stem’s constraint of both EC2 instances residing in the same VPC, as the group enforces physical proximity within a single Availability Zone, minimising hop count and packet jitter for sustained data flows.
- ✗
Use Elastic Fabric Adapter (EFA) for network communication.
Why it's wrong here
EFA is for tightly coupled HPC workloads, not typical SAP.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This PAS-C01 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the PAS-C01 exam.