PAS-C01 Operations and Maintenance Practice Question
This PAS-C01 practice question tests your understanding of operations and maintenance. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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 system running on EC2 is experiencing intermittent connectivity issues between application servers and the database server. The network team suspects that the security group rules are too restrictive. What is the best approach to identify which traffic is being blocked?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable VPC Flow Logs on the subnet or ENI and review the logs for rejected traffic.
Option A is correct because VPC Flow Logs capture traffic metadata and can show accepted and rejected traffic. Option B is wrong because CloudTrail logs API calls, not network traffic. Option C is wrong because CloudWatch metrics do not provide per-packet detail. Option D is wrong because the question is about network traffic, not application logs.
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.
✗
Check the SAP application logs for connection errors.
Why it's wrong here
Application logs indicate symptoms but not the network layer blocking.
✗
Enable AWS CloudTrail and look for security group modification events.
Why it's wrong here
CloudTrail is for API activity, not network traffic analysis.
✗
Use Amazon CloudWatch to monitor network packets.
Why it's wrong here
CloudWatch does not provide packet-level details.
✓
Enable VPC Flow Logs on the subnet or ENI and review the logs for rejected traffic.
Why this is correct
VPC Flow Logs capture information about IP traffic going to and from network interfaces.
Clue confirmation
The clue word "best" in the question point toward this answer.
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.
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: Enable VPC Flow Logs on the subnet or ENI and review the logs for rejected traffic. — Option A is correct because VPC Flow Logs capture traffic metadata and can show accepted and rejected traffic. Option B is wrong because CloudTrail logs API calls, not network traffic. Option C is wrong because CloudWatch metrics do not provide per-packet detail. Option D is wrong because the question is about network traffic, not application logs.
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: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
CIDR notation defines the prefix length.
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Question Discussion
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