Quick Answer
The answer is that the second interface is associated with a different security group. This is because the AWS CLI describe-network-interfaces command with a filter by security group ID, such as --filters Name=group-id,Values=sg-12345678, only returns network interfaces that are explicitly attached to that specific security group. If an EC2 instance has multiple network interfaces, each interface can belong to a different set of security groups, so only the interface matching the filter’s group ID appears in the output. On the AWS Certified Solutions Architect Professional SAP-C02 exam, this scenario tests your understanding of how security group filtering works at the network interface level rather than the instance level, a common trap where candidates assume the command lists all interfaces for an instance. Remember the memory tip: “Filter by group, not by box”—the command cares about the security group membership of each individual ENI, not the instance’s overall attachment.
This SAP-C02 practice question tests your understanding of continuous improvement for existing solutions. 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 security engineer runs the above command to list network interfaces attached to security group sg-12345678. The engineer notices that instance i-0a1b2c3d4e5f67890 has two network interfaces but only one is shown in the output. What is the MOST likely reason?
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.
The second interface is not attached to the instance.
Why wrong: Instance has two interfaces.
The second interface has a device index of 0.
Why wrong: Doesn't affect output.
The command only returns interfaces that are attached.
Why wrong: It returns all matching interfaces.
The second interface is associated with a different security group.
Filter limits to sg-12345678.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
The second interface is associated with a different security group.
Option D is correct because the command filters by security group ID, so only interfaces in that group are shown. The second interface may belong to a different security group. Option A is wrong because the filter is by group-id, not instance-id. Option B is wrong because the command does not filter by device index. Option C is wrong because the command can list all interfaces in the group regardless of attachment.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
The second interface is not attached to the instance.
Why it's wrong here
Instance has two interfaces.
The second interface has a device index of 0.
Why it's wrong here
Doesn't affect output.
The command only returns interfaces that are attached.
Why it's wrong here
It returns all matching interfaces.
The second interface is associated with a different security group.
Why this is correct
Filter limits to sg-12345678.
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.
Common exam traps
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.
Trap categories for this question
Command / output trap
Doesn't affect output.
Detailed technical explanation
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.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
Identify which SAP-C02 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.
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FAQ
Continuous Improvement for Existing Solutions — This question tests Continuous Improvement for Existing Solutions — Read the scenario before looking for a memorised answer..
The correct answer is: The second interface is associated with a different security group. — Option D is correct because the command filters by security group ID, so only interfaces in that group are shown. The second interface may belong to a different security group. Option A is wrong because the filter is by group-id, not instance-id. Option B is wrong because the command does not filter by device index. Option C is wrong because the command can list all interfaces in the group regardless of attachment.
Identify which SAP-C02 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.
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 20, 2026
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