The correct answer is that the user can describe all EC2 instances, but start and stop only those with the tag Environment=production. This is because the IAM policy for EC2 start/stop with tag-based conditions explicitly grants ec2:Describe* actions on all resources, while restricting StartInstances and StopInstances using a condition key that checks for the specific tag. On the AWS Certified SAP on AWS Specialty PAS-C01 exam, this tests your understanding of how resource-level permissions and condition keys work together to enforce granular access control, a common scenario when managing SAP EC2 instances in production environments. A frequent trap is assuming that a Deny effect is needed to block actions on untagged instances, but here the Allow is scoped by the condition, so instances without the tag are simply not covered by the permission. Remember the memory tip: “Describe all, but start/stop only the tagged ones” — the condition is the gatekeeper for write actions.
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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Describe all EC2 instances, but start and stop only those with the tag Environment=production.
Option C is correct because the policy allows ec2:Describe* on all resources, and StartInstances and StopInstances only on instances with tag Environment=production. The user cannot start/stop instances without the tag. Option A is wrong because the user can describe all instances. Option B is wrong because the user can only start/stop production instances. Option D is wrong because the policy does not allow termination.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Describe all EC2 instances, but start and stop only those with the tag Environment=production.
Why this is correct
The describe action is wildcard; start/stop have condition.
Related concept
Static NAT maps one inside address to one outside address.
✗
Describe, start, and stop all EC2 instances regardless of tags.
Why it's wrong here
Start/stop are restricted by tag.
✗
Start and stop any EC2 instance in the account.
Why it's wrong here
The condition restricts to production-tagged instances.
✗
Terminate any EC2 instance with the tag Environment=production.
Why it's wrong here
The policy does not include the ec2:TerminateInstances action.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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 the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related PAS-C01 NAT questions on configuration and troubleshooting.
Operations and Maintenance — This question tests Operations and Maintenance — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Describe all EC2 instances, but start and stop only those with the tag Environment=production. — Option C is correct because the policy allows ec2:Describe* on all resources, and StartInstances and StopInstances only on instances with tag Environment=production. The user cannot start/stop instances without the tag. Option A is wrong because the user can describe all instances. Option B is wrong because the user can only start/stop production instances. Option D is wrong because the policy does not allow termination.
What should I do if I get this PAS-C01 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related PAS-C01 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Question Discussion
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