The answer is to increase the EC2 instance size to a larger type with more CPU and memory. This directly reduces SAP application latency by providing additional compute and memory resources to handle peak processing loads, which is the core concept of vertical scaling. On the AWS Certified SAP on AWS Specialty PAS-C01 exam, this scenario tests your understanding that SAP performance bottlenecks during high demand are often resolved by scaling up the instance, not by changing network components. A common trap is confusing outbound traffic fixes, like NAT Gateway adjustments, with inbound processing latency—the NAT Gateway only affects internet-bound traffic, not the instance’s compute speed. Similarly, EBS optimization improves disk I/O but does not address CPU or memory constraints, and changing subnets has no performance impact. Remember the memory tip: when SAP is slow, think “scale up, not out” for direct latency reduction.
PAS-C01 Technology Practice Question
This PAS-C01 practice question tests your understanding of technology. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 application running on an EC2 instance is experiencing high latency during peak hours. The instance is in a private subnet with a NAT Gateway for outbound internet. Which action would most effectively reduce latency for SAP users?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Increase the EC2 instance size to a larger type with more CPU and memory.
Option A is correct because increasing instance size provides more CPU and memory, directly reducing processing latency. Option B is wrong because NATGateway is for outbound traffic, not inbound latency. Option C is wrong because EBS optimization helps disk I/O, not network latency. Option D is wrong because changing subnet does not affect performance.
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.
✓
Increase the EC2 instance size to a larger type with more CPU and memory.
Why this is correct
Larger instance type directly improves compute performance, reducing application latency.
Move the instance to a public subnet and assign a public IP address.
Why it's wrong here
Moving to public subnet does not inherently improve performance and introduces security risks.
✗
Replace the NAT Gateway with an Internet Gateway.
Why it's wrong here
Internet Gateway is for public subnets; private subnet still needs NAT for outbound. This does not reduce latency for inbound SAP traffic.
✗
Enable EBS optimization on the instance.
Why it's wrong here
EBS optimization improves disk throughput but not network latency for SAP application.
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
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.
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: Increase the EC2 instance size to a larger type with more CPU and memory. — Option A is correct because increasing instance size provides more CPU and memory, directly reducing processing latency. Option B is wrong because NAT Gateway is for outbound traffic, not inbound latency. Option C is wrong because EBS optimization helps disk I/O, not network latency. Option D is wrong because changing subnet does not affect performance.
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.
What is the key concept behind this question?
CIDR notation defines the prefix length.
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Question Discussion
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