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 financial reporting platform 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 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.
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.
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A public Elastic IP address on each instance
Why it's wrong here
Public IPs do not provide secure administrative access by themselves.
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.
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An internet gateway attached to the private subnet
Why it's wrong here
Internet gateways do not make private administration secure.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often default to a bastion host (Option B) as the traditional solution, but the question explicitly prohibits opening SSH or RDP ports to the internet, and a bastion host still requires those ports open (even if restricted to a CIDR), which fails the requirement; Session Manager avoids any inbound port exposure entirely.
Detailed technical explanation
How to think about this question
Session Manager leverages the AWS Systems Manager agent to initiate an outbound connection to the AWS Systems Manager service over HTTPS (TCP 443), which then allows an administrator to start a session via the AWS Management Console, CLI, or SDK. The agent uses the IAM instance role to authenticate and authorize the session, and all commands are logged to Amazon S3 or CloudWatch Logs for auditing. In a real-world scenario, this is critical for compliance frameworks like PCI-DSS or SOC 2 that require no inbound network access to sensitive instances.
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 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.
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.
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Question Discussion
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