- A
The EC2 instance must be in a public subnet.
Why wrong: Incorrect: Instances do not need to be in a public subnet; they can be in a private subnet with outbound internet access or a VPC endpoint.
- B
The EC2 instance must be running Amazon Linux 2.
Why wrong: Incorrect: Patch Manager supports various Linux distributions and Windows, not only Amazon Linux 2.
- C
The AWS Systems Manager Agent (SSM Agent) must be installed on the EC2 instance.
Correct: The SSM Agent must be installed and running on the instance to enable patching via Patch Manager.
- D
An IAM role with permissions for Systems Manager must be attached to the EC2 instance.
Correct: An IAM role with appropriate permissions (e.g., AmazonSSMManagedInstanceCore) must be attached to the instance.
- E
A maintenance window must be configured with a reboot option.
Why wrong: Incorrect: A maintenance window is optional; patching can be performed on demand or via a schedule.
PAS-C01 Migration Practice Question
This PAS-C01 practice question tests your understanding of migration. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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.
A company is migrating a SAP system to AWS and wants to use AWS Systems Manager for patching. Which TWO prerequisites are required to use AWS Systems Manager Patch Manager?
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 AWS Systems Manager Agent (SSM Agent) must be installed on the EC2 instance.
Correct options are C and D. The SSM Agent must be installed and running on the EC2 instances (C), and the instances must have an IAM role that grants Systems Manager permissions (D). Option A is incorrect because Patch Manager works with instances in private subnets as long as they have outbound internet access or a VPC endpoint. Option B is incorrect because Patch Manager supports multiple operating systems, not just Amazon Linux 2. Option E is incorrect because a maintenance window is not strictly required for Patch Manager; patching can be done on demand.
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 EC2 instance must be in a public subnet.
Why it's wrong here
Incorrect: Instances do not need to be in a public subnet; they can be in a private subnet with outbound internet access or a VPC endpoint.
- ✗
The EC2 instance must be running Amazon Linux 2.
Why it's wrong here
Incorrect: Patch Manager supports various Linux distributions and Windows, not only Amazon Linux 2.
- ✓
The AWS Systems Manager Agent (SSM Agent) must be installed on the EC2 instance.
Why this is correct
Correct: The SSM Agent must be installed and running on the instance to enable patching via Patch Manager.
Related concept
CIDR notation defines the prefix length.
- ✓
An IAM role with permissions for Systems Manager must be attached to the EC2 instance.
Why this is correct
Correct: An IAM role with appropriate permissions (e.g., AmazonSSMManagedInstanceCore) must be attached to the instance.
Related concept
CIDR notation defines the prefix length.
- ✗
A maintenance window must be configured with a reboot option.
Why it's wrong here
Incorrect: A maintenance window is optional; patching can be performed on demand or via a schedule.
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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FAQ
Questions learners often ask
What does this PAS-C01 question test?
Migration — This question tests Migration — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: The AWS Systems Manager Agent (SSM Agent) must be installed on the EC2 instance. — Correct options are C and D. The SSM Agent must be installed and running on the EC2 instances (C), and the instances must have an IAM role that grants Systems Manager permissions (D). Option A is incorrect because Patch Manager works with instances in private subnets as long as they have outbound internet access or a VPC endpoint. Option B is incorrect because Patch Manager supports multiple operating systems, not just Amazon Linux 2. Option E is incorrect because a maintenance window is not strictly required for Patch Manager; patching can be done on demand.
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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