The answer is enabling Enhanced Networking (ENA) and placing the instances in a placement group with cluster placement. This configuration is required because SAP HANA system replication demands low-latency, high-throughput networking to keep the secondary instance in sync with minimal data loss, and ENA provides higher packet-per-second performance and lower jitter compared to standard networking. On the AWS Certified SAP on AWS Specialty PAS-C01 exam, this question tests your understanding that while cluster placement groups are ideal for single-AZ low latency, cross-AZ replication still relies on ENA to maximize network performance; a common trap is choosing VPC Peering or VPN, which add unnecessary overhead or are designed for different connectivity scenarios. Remember the memory tip: “ENA for speed, placement for proximity” — ENA ensures the replication traffic has the bandwidth and low latency needed, while the placement group minimizes physical distance between instances when possible.
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 team is implementing SAP HANA system replication across two AWS Availability Zones. The HANA primary instance uses Premium SSD v2 (P30) managed disks. The secondary instance must be kept in sync with minimal data loss. Which networking configuration is required to ensure low-latency, high-throughput replication traffic between the instances?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "primary"
Why it matters: Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
Why wrong: ClassicLink is deprecated and not applicable for EC2-VPC.
B
Set up a VPN connection between the instances.
Why wrong: VPN adds latency and is not needed within the same region.
C
Enable Enhanced Networking (ENA) and place the instances in a placement group with cluster placement.
ENA provides higher bandwidth and lower jitter; cluster placement groups offer the lowest latency between instances, but cross-AZ still benefits from ENA.
D
Configure VPC peering between the two subnets.
Why wrong: VPC peering is used to connect different VPCs, not subnets within the same VPC.
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) and place the instances in a placement group with cluster placement.
Option A is correct because placement groups with cluster placement provide low-latency networking within a single AZ, but for cross-AZ replication, enabling ENA and using enhanced networking is essential. Option B (ClassicLink) is obsolete. Option C (VPN) adds overhead. Option D (VPC Peering) is for VPC-to-VPC, not within the same VPC.
Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Use ClassicLink to connect the instances.
Why it's wrong here
ClassicLink is deprecated and not applicable for EC2-VPC.
✗
Set up a VPN connection between the instances.
Why it's wrong here
VPN adds latency and is not needed within the same region.
✓
Enable Enhanced Networking (ENA) and place the instances in a placement group with cluster placement.
Why this is correct
ENA provides higher bandwidth and lower jitter; cluster placement groups offer the lowest latency between instances, but cross-AZ still benefits from ENA.
Clue confirmation
The clue word "primary" in the question point toward this answer.
VPC peering is used to connect different VPCs, not subnets within the same VPC.
Common exam traps
Common exam trap: usable hosts are not the same as total addresses
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Detailed technical explanation
How to think about this question
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
KKey Concepts to Remember
CIDR notation defines the prefix length.
Block size helps identify subnet boundaries.
Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
The required host count determines the smallest suitable subnet.
TExam Day Tips
→Write the block size before choosing the subnet.
→Check whether the question asks for hosts, subnets or a specific address range.
→Do not confuse /24, /25, /26 and /27 host counts.
Key takeaway
Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Real-world example
How this comes up in practice
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
What to study next
Got this wrong? Here's your next step.
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related PAS-C01 subnetting questions on CIDR, address ranges, and subnet selection.
Technology — This question tests Technology — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: Enable Enhanced Networking (ENA) and place the instances in a placement group with cluster placement. — Option A is correct because placement groups with cluster placement provide low-latency networking within a single AZ, but for cross-AZ replication, enabling ENA and using enhanced networking is essential. Option B (ClassicLink) is obsolete. Option C (VPN) adds overhead. Option D (VPC Peering) is for VPC-to-VPC, not within the same VPC.
What should I do if I get this PAS-C01 question wrong?
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related PAS-C01 subnetting questions on CIDR, address ranges, and subnet selection.
Are there clue words in this question I should notice?
Yes — watch for: "primary". Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
What is the key concept behind this question?
CIDR notation defines the prefix length.
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