The answer is AWS Systems Manager Session Manager with the required instance role. This solution allows administrators to connect to EC2 instances without opening SSH or RDP ports to the internet because the SSM Agent initiates an outbound connection to the AWS cloud over HTTPS (port 443), eliminating the need for any inbound firewall rules or public IP addresses. The instance role grants the agent permission to communicate with Systems Manager, enabling secure, auditable sessions that bypass bastion hosts entirely. On the SAA-C03 exam, this scenario tests your understanding of how to achieve secure EC2 access without SSH/RDP ports, often appearing as a trap where candidates mistakenly choose a bastion host or VPN. Remember the key principle: Session Manager works by the agent calling out to AWS, not by you calling in. A helpful memory tip is “Agent calls home, no ports open alone.”
SAA-C03 Design Secure Architectures Practice Question
This SAA-C03 practice question tests your understanding of design secure architectures. 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 hosts a image sharing application on EC2. Administrators must connect without opening SSH or RDP ports to the internet. What should the architect use?
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 with the required instance role
AWS Systems Manager Session Manager allows administrators to establish secure shell (SSH) or PowerShell (RDP) sessions to EC2 instances without opening any inbound ports. It uses the SSM Agent and the AWS Systems Manager service, which initiates outbound connections to the AWS cloud over HTTPS (port 443). The required instance role grants permissions for the agent to communicate with Systems Manager, enabling secure, auditable access without public IP addresses or bastion hosts.
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 with the required instance role
Why this is correct
Session Manager provides audited shell access without inbound SSH/RDP exposure.
Related concept
Read the scenario before looking for a memorised answer.
✗
An internet gateway attached to the private subnet
Why it's wrong here
Internet gateways do not make private administration secure.
✗
A public Elastic IP address on each instance
Why it's wrong here
Public IPs do not provide secure administrative access by themselves.
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often default to a bastion host (Option D) as a traditional solution, but fail to recognize that a bastion host still requires opening SSH/RDP to the internet (even if only to the bastion), which violates the 'without opening SSH or RDP ports to the internet' constraint.
Detailed technical explanation
How to think about this question
Session Manager leverages the AWS Systems Manager agent (ssm-agent) which runs on the EC2 instance and establishes a bidirectional WebSocket connection over HTTPS (TCP 443) to the AWS Systems Manager service. This eliminates the need for a jump box or bastion host, and all session activity can be logged to Amazon S3 or CloudWatch Logs for auditing. In real-world scenarios, this is critical for compliance frameworks like PCI-DSS or HIPAA that require strict network isolation and no inbound management ports.
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.
Design Secure Architectures — This question tests Design Secure Architectures — 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 with the required instance role — AWS Systems Manager Session Manager allows administrators to establish secure shell (SSH) or PowerShell (RDP) sessions to EC2 instances without opening any inbound ports. It uses the SSM Agent and the AWS Systems Manager service, which initiates outbound connections to the AWS cloud over HTTPS (port 443). The required instance role grants permissions for the agent to communicate with Systems Manager, enabling secure, auditable access without public IP addresses or bastion hosts.
What should I do if I get this SAA-C03 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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A company hosts a B2B file exchange site on EC2. Administrators must connect without opening SSH or RDP ports to the internet. What should the architect use? The design must avoid adding custom operational scripts.
medium
A.A bastion host with SSH open to 0.0.0.0/0
✓ B.AWS Systems Manager Session Manager with the required instance role
C.A public Elastic IP address on each instance
D.An internet gateway attached to the private subnet
Why B: AWS Systems Manager Session Manager allows administrators to establish secure shell access to EC2 instances without opening inbound SSH or RDP ports, using the Systems Manager agent and an IAM instance role. This meets the requirement for no internet-exposed ports and avoids custom operational scripts because Session Manager is a fully managed AWS service.
Variation 2. A company hosts a B2B file exchange site on EC2. Administrators must connect without opening SSH or RDP ports to the internet. What should the architect use?
medium
A.A bastion host with SSH open to 0.0.0.0/0
✓ B.AWS Systems Manager Session Manager with the required instance role
C.A public Elastic IP address on each instance
D.An internet gateway attached to the private subnet
Why B: AWS Systems Manager Session Manager allows secure shell access to EC2 instances without opening inbound ports (SSH 22 or RDP 3389) to the internet. It uses the AWS Systems Manager agent and an IAM instance role to establish a bidirectional connection via the AWS cloud, eliminating the need for a bastion host or public IP. This meets the requirement for administrators to connect without exposing any network ports.
Variation 3. A company hosts a financial reporting platform on EC2. Administrators must connect without opening SSH or RDP ports to the internet. What should the architect use?
medium
A.A public Elastic IP address on each instance
B.A bastion host with SSH open to 0.0.0.0/0
✓ C.AWS Systems Manager Session Manager with the required instance role
D.An internet gateway attached to the private subnet
Why C: AWS Systems Manager Session Manager allows secure shell access to EC2 instances without opening inbound ports (SSH 22 or RDP 3389) to the internet. It uses the AWS Systems Manager agent on the instance, combined with an IAM instance role that grants permissions to communicate with the Systems Manager API, establishing a bidirectional tunnel over HTTPS (port 443). This satisfies the requirement of no public-facing SSH or RDP ports while enabling administrative connectivity.
Variation 4. A company hosts a e-learning platform on EC2. Administrators must connect without opening SSH or RDP ports to the internet. What should the architect use?
medium
A.A public Elastic IP address on each instance
B.A bastion host with SSH open to 0.0.0.0/0
C.An internet gateway attached to the private subnet
✓ D.AWS Systems Manager Session Manager with the required instance role
Why D: AWS Systems Manager Session Manager allows secure shell access to EC2 instances without opening inbound ports (SSH/RDP) or using a bastion host. It uses the AWS Systems Manager agent and an IAM instance role to establish a bidirectional connection over HTTPS to the AWS Systems Manager service, eliminating the need for public IP addresses or internet-facing security groups.
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Question Discussion
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