The answer is properly configuring security groups and access control lists (ACLs) to limit network access, as this is the primary concern for protecting data in an IaaS cloud environment. Under the shared responsibility model, the cloud provider secures the physical infrastructure, but the customer retains full control over the virtual network layer, making misconfiguration the leading risk for data exposure. Security groups act as stateful virtual firewalls, while ACLs provide stateless subnet-level filtering; together, they enforce least-privilege access and directly prevent unauthorized traffic to instances. On the CISA exam, this question tests your grasp of the shared responsibility model and the customer’s duty to secure network boundaries—a common trap is assuming the provider handles all security. Remember: in IaaS, you manage the stack above the hypervisor, so misconfiguration of these controls is the primary concern. Memory tip: think “S-A-L”—Security groups (stateful) and ACLs (stateless) are your first line of defense against data leaks.
CISA Protection of Information Assets Practice Question
This CISA practice question tests your understanding of protection of information assets. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 its applications to a public IaaS cloud. What is the primary concern for protecting data in this environment?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "primary"
Why it matters: Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Properly configuring security groups and access control lists (ACLs) to limit network access.
In an IaaS public cloud, the customer retains responsibility for securing the network layer, including virtual firewalls. Security groups (stateful) and ACLs (stateless) are the primary mechanisms to enforce least-privilege network access, which directly protects data from unauthorized exposure over the network. This aligns with the shared responsibility model where the provider secures the physical infrastructure, but the customer must control traffic to their instances.
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.
✗
Regularly patching the operating system and applications.
Why it's wrong here
Patching reduces known vulnerabilities but misconfigurations are a more common issue in cloud deployments.
✗
Using only hardened virtual machine images from the provider.
Why it's wrong here
Hardened images reduce vulnerabilities but do not address network-level access controls.
✗
Ensuring encryption keys are stored in the cloud provider's key management service.
Why it's wrong here
Key management is important but misconfigurations of security groups are more frequently exploited.
✓
Properly configuring security groups and access control lists (ACLs) to limit network access.
Why this is correct
Misconfigured security groups can expose resources to the internet, leading to unauthorized access. This is the top risk in IaaS.
Clue confirmation
The clue word "primary" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often focus on encryption or patching as the universal answer for data protection, but in an IaaS shared responsibility model, the primary concern is controlling network access because the cloud provider does not manage the customer's virtual network boundaries.
Detailed technical explanation
How to think about this question
Security groups act as a stateful virtual firewall at the instance level, automatically allowing return traffic for permitted outbound connections, while network ACLs provide stateless filtering at the subnet level, requiring explicit rules for both inbound and outbound traffic. A common real-world scenario is misconfiguring a security group to allow 0.0.0.0/0 on port 22 (SSH) or 3389 (RDP), which exposes the instance to brute-force attacks from the entire internet. Properly scoping security group rules to specific source IP ranges or using bastion hosts is essential to prevent data breaches.
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 small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
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.
Protection of Information Assets — This question tests Protection of Information Assets — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Properly configuring security groups and access control lists (ACLs) to limit network access. — In an IaaS public cloud, the customer retains responsibility for securing the network layer, including virtual firewalls. Security groups (stateful) and ACLs (stateless) are the primary mechanisms to enforce least-privilege network access, which directly protects data from unauthorized exposure over the network. This aligns with the shared responsibility model where the provider secures the physical infrastructure, but the customer must control traffic to their instances.
What should I do if I get this CISA question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "primary". Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
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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