- A
Review the network ACL rules for both the public and private subnets.
Network ACLs can block traffic if misconfigured.
- B
Verify that the route tables have a route to the internet gateway.
Why wrong: Route tables are for subnet routing, not direct connectivity between instances in the same VPC.
- C
Assign an Elastic IP to the SCS instance.
Why wrong: Elastic IPs are for internet connectivity, not internal communication.
- D
Check the security group rules on the application servers.
Why wrong: Security groups have already been verified.
Question 916 of 1,733
PAS-C01 Operations and Maintenance Practice Question
This PAS-C01 practice question tests your understanding of operations and maintenance. 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 operations team manages an SAP ERP system on AWS that uses a single EC2 instance for the SAP central services (SCS) and multiple instances for application servers. The system is running in a VPC with both public and private subnets. The team notices that the SCS instance is unreachable from the application servers after a maintenance window where network ACLs were updated. The application servers are in private subnets, and the SCS instance is in a public subnet. The team has verified that the security groups allow the required traffic. Which step should the team take to resolve the connectivity issue?
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
✓
Review the network ACL rules for both the public and private subnets.
The issue is that after maintenance, network ACLs were updated, causing connectivity loss between the SCS instance (public subnet) and application servers (private subnets). Network ACLs are stateless and control traffic at the subnet level. Since security groups are already verified, the likely cause is the NACL rules. Option A is correct because reviewing NACL rules for both subnets will identify missing inbound/outbound rules. Option B is incorrect because route tables to the internet gateway affect internet-bound traffic, not internal VPC traffic. Option C is incorrect because Elastic IPs are for internet access, not internal connectivity. Option D is incorrect because security groups were confirmed to allow traffic, so the issue is at the NACL level.
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.
- ✓
Review the network ACL rules for both the public and private subnets.
Why this is correct
Network ACLs can block traffic if misconfigured.
Related concept
CIDR notation defines the prefix length.
- ✗
Verify that the route tables have a route to the internet gateway.
Why it's wrong here
Route tables are for subnet routing, not direct connectivity between instances in the same VPC.
- ✗
Assign an Elastic IP to the SCS instance.
Why it's wrong here
Elastic IPs are for internet connectivity, not internal communication.
- ✗
Check the security group rules on the application servers.
Why it's wrong here
Security groups have already been verified.
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.
Visual reference
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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Operations and Maintenance — study guide chapter
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FAQ
Questions learners often ask
What does this PAS-C01 question test?
Operations and Maintenance — This question tests Operations and Maintenance — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: Review the network ACL rules for both the public and private subnets. — The issue is that after maintenance, network ACLs were updated, causing connectivity loss between the SCS instance (public subnet) and application servers (private subnets). Network ACLs are stateless and control traffic at the subnet level. Since security groups are already verified, the likely cause is the NACL rules. Option A is correct because reviewing NACL rules for both subnets will identify missing inbound/outbound rules. Option B is incorrect because route tables to the internet gateway affect internet-bound traffic, not internal VPC traffic. Option C is incorrect because Elastic IPs are for internet access, not internal connectivity. Option D is incorrect because security groups were confirmed to allow traffic, so the issue is at the NACL level.
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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Last reviewed: Jun 20, 2026
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