- A
The security group inbound rule for the database has reached its rule evaluation limit.
Why wrong: Security group rules are evaluated logically; there is no rule evaluation limit causing intermittent drops.
- B
The connection tracking table for the database security group is full, dropping new connections.
Security groups maintain connection tracking; when the table fills, new connections are dropped until old ones expire.
- C
The application servers are using a single NAT Gateway for outbound traffic, causing a bottleneck.
Why wrong: NAT Gateway is for outbound internet traffic, not for internal VPC communication.
- D
The database is accessed through a VPC Endpoint, which is rate-limiting connections.
Why wrong: VPC Endpoints are used for AWS services like S3, not for database connectivity within the same VPC.
Quick Answer
The correct answer is that the connection tracking table for the database security group is full, dropping new connections. This occurs because AWS security groups are stateful and maintain a connection tracking table to monitor active traffic flows; once this table reaches its limit—typically 55,000 tracked connections per security group instance—new connections are silently dropped, even though the security group rules themselves are correctly configured. On the AWS Certified SAP on AWS Specialty PAS-C01 exam, this scenario tests your understanding of how stateful security groups differ from stateless network ACLs, and it often appears as a trap where candidates mistakenly blame NACLs or routing. A common memory tip is to remember that security groups track state, so during peak SAP loads, the tracking table can overflow like a bucket—once full, new flows spill out.
PAS-C01 Technology Practice Question
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.
An SAP ERP system on AWS is experiencing intermittent connectivity issues between the SAP application servers and the database server. Both are in the same VPC, but in different subnets. The security group for the database allows traffic from the application security group. Network ACLs are default (allow all). Despite this, some application servers cannot connect during peak loads. What is the most likely cause?
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 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
The connection tracking table for the database security group is full, dropping new connections.
Option D is correct because security groups have a limit on the number of connections they can track, and during peak loads, the connection tracking table can become full, causing new connections to be dropped. Option A is wrong because if there are multiple subnets, a single NAT gateway is not relevant for internal traffic. Option B is wrong because VPC endpoints are for AWS services, not for database connectivity. Option C is wrong because security group rules are stateful and do not have a rule evaluation limit in this context.
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.
- ✗
The security group inbound rule for the database has reached its rule evaluation limit.
Why it's wrong here
Security group rules are evaluated logically; there is no rule evaluation limit causing intermittent drops.
- ✓
The connection tracking table for the database security group is full, dropping new connections.
Why this is correct
Security groups maintain connection tracking; when the table fills, new connections are dropped until old ones expire.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
CIDR notation defines the prefix length.
- ✗
The application servers are using a single NAT Gateway for outbound traffic, causing a bottleneck.
- ✗
The database is accessed through a VPC Endpoint, which is rate-limiting connections.
Why it's wrong here
VPC Endpoints are used for AWS services like S3, not for database connectivity 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
A company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
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.
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FAQ
Questions learners often ask
What does this PAS-C01 question test?
Technology — This question tests Technology — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: The connection tracking table for the database security group is full, dropping new connections. — Option D is correct because security groups have a limit on the number of connections they can track, and during peak loads, the connection tracking table can become full, causing new connections to be dropped. Option A is wrong because if there are multiple subnets, a single NAT gateway is not relevant for internal traffic. Option B is wrong because VPC endpoints are for AWS services, not for database connectivity. Option C is wrong because security group rules are stateful and do not have a rule evaluation limit in this context.
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: "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?
CIDR notation defines the prefix length.
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Last reviewed: Jun 20, 2026
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.
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