The answer is that the instance lacks an IAM instance profile with Systems Manager permissions. Session Manager requires the SSM Agent to communicate with the AWS Systems Manager service, but the agent alone is insufficient; the EC2 instance must have an attached IAM role that grants the necessary permissions, such as AmazonSSMManagedInstanceCore. Without this profile, the instance cannot authenticate to Systems Manager, even if the agent is installed via UserData, because the security group and instance type are irrelevant to this authentication failure. On the AWS Certified SAP on AWS Specialty PAS-C01 exam, this scenario tests your understanding of the prerequisite IAM role for SSM Session Manager, often appearing as a trap where candidates focus on network or agent issues instead. Remember the mnemonic: “No profile, no session” — the IAM instance profile is the gatekeeper for SSM connectivity.
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.
Exhibit
Refer to the exhibit.
"Resources:
SAPApplicationServer:
Type: AWS::EC2::Instance
Properties:
InstanceType: !Ref InstanceType
SecurityGroupIds:
- !Ref AppSecurityGroup
UserData:
Fn::Base64: !Sub |
#!/bin/bash
yum install -y https://s3.amazonaws.com/ec2-downloads-windows/SSMAgent/latest/linux_amd64/amazon-ssm-agent.rpm
Tags:
- Key: Name
Value: SAP-APP-Server
AppSecurityGroup:
Type: AWS::EC2::SecurityGroup
Properties:
GroupDescription: Security group for SAP application servers
SecurityGroupIngress:
- IpProtocol: tcp
FromPort: 443
ToPort: 443
CidrIp: 0.0.0.0/0"
Refer to the exhibit. An SAP administrator uses the CloudFormation template snippet to create an application server. After deployment, the administrator cannot connect to the instance using AWS Systems Manager Session Manager. What is the most likely missing configuration?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The instance does not have an IAM instance profile with Systems Manager permissions
Session Manager requires the SSM Agent and an IAM role with proper permissions. The template installs the agent via UserData, but it does not attach an IAM instance profile. Without the profile, the instance cannot authenticate to Systems Manager. The security group allows HTTPS inbound, but that is for web traffic, not SSM. The instance type is fine.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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 UserData script fails to install the SSM Agent
Why it's wrong here
The script looks correct; even if agent fails, the missing IAM role would still block access.
✓
The instance does not have an IAM instance profile with Systems Manager permissions
Why this is correct
An IAM role with AmazonSSMManagedInstanceCore policy is required for Session Manager.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The security group does not allow outbound traffic to the Systems Manager endpoint
Why it's wrong here
Session Manager typically uses VPC endpoints or internet, but the missing IAM role is the primary issue.
✗
The instance type does not support Systems Manager
Why it's wrong here
All EC2 instance types support Systems Manager.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
Identify which PAS-C01 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Operations and Maintenance — This question tests Operations and Maintenance — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The instance does not have an IAM instance profile with Systems Manager permissions — Session Manager requires the SSM Agent and an IAM role with proper permissions. The template installs the agent via UserData, but it does not attach an IAM instance profile. Without the profile, the instance cannot authenticate to Systems Manager. The security group allows HTTPS inbound, but that is for web traffic, not SSM. The instance type is fine.
What should I do if I get this PAS-C01 question wrong?
Identify which PAS-C01 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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