PAS-C01 Operations and Maintenance Practice Question
Network Topology
An operations engineer runs the AWS CLI command above to check the state of an EC2 instance. The output shows the instance is running. However, the SAP application cannot connect to the instance. The security group allows inbound traffic on port 443 from the application's IP. What is the most likely cause of 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
✓
The network ACL for the subnet does not allow outbound traffic
The instance is running, so the issue is likely network configuration. A network ACL is stateless and must allow both inbound and outbound traffic. If the outbound rule denies traffic, responses are blocked. Security groups are stateful. The instance state is running, so it is not stopped or terminated. The command only checks state, not health checks.
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 network ACL for the subnet does not allow outbound traffic
Why this is correct
Network ACLs are stateless; if outbound rules are missing, return traffic is blocked.
- ✗
The instance is in a stopped state
Why it's wrong here
The output shows the instance is running.
- ✗
The instance is not passing its status checks
Why it's wrong here
Status checks affect instance health but not basic network connectivity.
- ✗
The security group is not associated with the instance
Why it's wrong here
The engineer can verify association; if not associated, traffic would be blocked.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.