- A
AWS Systems Manager Session Manager
Correct. Session Manager offers browser-based shell access to EC2 instances through the AWS Management Console or CLI, using the SSM Agent and without requiring any inbound open ports. It is designed for secure, agent-based instance management.
- B
AWS Certificate Manager
Why wrong: Incorrect. AWS Certificate Manager (ACM) provisions, manages, and deploys public and private SSL/TLS certificates for use with AWS services like ELB, CloudFront, and API Gateway. It does not provide shell access to instances.
- C
AWS CloudHSM
Why wrong: Incorrect. AWS CloudHSM provides dedicated hardware security modules (HSMs) for cryptographic key storage and operations, meeting compliance requirements for key management. It does not provide remote shell access.
- D
Amazon GuardDuty
Why wrong: Incorrect. Amazon GuardDuty is a continuous threat detection service that analyzes AWS CloudTrail logs, VPC Flow Logs, and DNS logs to identify malicious or unauthorized behavior. It does not provide interactive shell sessions.
Quick Answer
The answer is AWS Systems Manager Session Manager. This service is the correct choice because it enables secure shell access to EC2 instances without opening SSH ports or RDP ports, using the SSM Agent installed on the instance to establish a bidirectional connection over HTTPS (port 443) to the AWS Systems Manager service. Instead of relying on inbound security group rules or bastion hosts, Session Manager leverages IAM policies for authentication and authorization, allowing operations teams to manage instances directly from the AWS Management Console without managing SSH keys or public IP addresses. On the AWS Certified Cloud Practitioner CLF-C02 exam, this question tests your understanding of secure, agent-based management services that replace traditional bastion host architectures. A common trap is confusing Session Manager with EC2 Instance Connect, but remember that Instance Connect still requires port 22 open for SSH, while Session Manager requires no open inbound ports. Memory tip: think “SSM = Secure Shell Minus ports” — no 22, no 3389, just HTTPS and IAM.
CLF-C02 Security and Compliance Practice Question
This CLF-C02 practice question tests your understanding of security and compliance. 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's security policy prohibits opening SSH (port 22) or RDP (port 3389) to the internet for any Amazon EC2 instance. The operations team needs a way to establish secure shell sessions to manage instances directly from the AWS Management Console without managing bastion hosts or SSH keys. Which AWS service provides this capability?
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
AWS Systems Manager Session Manager
AWS Systems Manager Session Manager enables secure shell access to EC2 instances directly from the AWS Management Console without opening inbound ports (22 or 3389) or managing bastion hosts. It uses the SSM Agent and AWS Identity and Access Management (IAM) policies to establish a bidirectional connection over HTTPS (port 443), eliminating the need for SSH keys or public IP addresses. This fully satisfies the security policy requirement while providing the desired management capability.
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.
- ✓
AWS Systems Manager Session Manager
Why this is correct
Correct. Session Manager offers browser-based shell access to EC2 instances through the AWS Management Console or CLI, using the SSM Agent and without requiring any inbound open ports. It is designed for secure, agent-based instance management.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
AWS Certificate Manager
- ✗
AWS CloudHSM
Why it's wrong here
Incorrect. AWS CloudHSM provides dedicated hardware security modules (HSMs) for cryptographic key storage and operations, meeting compliance requirements for key management. It does not provide remote shell access.
- ✗
Amazon GuardDuty
Why it's wrong here
Incorrect. Amazon GuardDuty is a continuous threat detection service that analyzes AWS CloudTrail logs, VPC Flow Logs, and DNS logs to identify malicious or unauthorized behavior. It does not provide interactive shell sessions.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse AWS Certificate Manager (a certificate provisioning service) or AWS CloudHSM (a hardware security module) with a secure access tool, when the correct answer is a systems management service that operates over HTTPS without opening traditional remote access ports.
Detailed technical explanation
How to think about this question
Session Manager leverages the SSM Agent installed on the EC2 instance to create a secure WebSocket connection through the AWS Systems Manager service, using IAM policies for authentication and authorization. All session data is encrypted in transit using TLS 1.2 and can be optionally logged to Amazon S3 or Amazon CloudWatch Logs for auditing. In a real-world scenario, this allows operations teams to manage instances in private subnets without any public exposure, even if the instance has no Elastic IP or public DNS.
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.
TExam Day Tips
- 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 exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
- →
Security and Compliance — study guide chapter
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FAQ
Questions learners often ask
What does this CLF-C02 question test?
Security and Compliance — This question tests Security and Compliance — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: AWS Systems Manager Session Manager — AWS Systems Manager Session Manager enables secure shell access to EC2 instances directly from the AWS Management Console without opening inbound ports (22 or 3389) or managing bastion hosts. It uses the SSM Agent and AWS Identity and Access Management (IAM) policies to establish a bidirectional connection over HTTPS (port 443), eliminating the need for SSH keys or public IP addresses. This fully satisfies the security policy requirement while providing the desired management capability.
What should I do if I get this CLF-C02 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
This CLF-C02 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 CLF-C02 exam.
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