Question 830 of 1,000

Cloud Security Operations →hardMultiple ChoiceObjective-mapped

CCSP Cloud Security Operations Practice Question

This CCSP practice question tests your understanding of cloud security operations. 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.

During a cloud security incident, a security team needs to isolate a compromised EC2 instance that is performing outbound port scanning. Which containment action should be taken first?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

Clue: "first"
Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.

A
Terminate the instance immediately
Why wrong: Termination might be needed later, but immediate termination could destroy forensic evidence.
B
Modify the security group to deny outbound traffic
This stops the malicious activity while preserving the instance for investigation.
C
Create an AMI of the instance for analysis
Why wrong: Creating an AMI is good for forensics but does not stop the scanning.
D
Detach the instance from the VPC
Why wrong: Detaching from VPC is not a standard AWS operation; you would change the security group.

Full breakdown with real-world context →

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

✓

Modify the security group to deny outbound traffic

Modifying the instance's security group to deny all outbound traffic is a quick and reversible containment action that stops the scanning.

Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

✗
Terminate the instance immediately
Why it's wrong here
Termination might be needed later, but immediate termination could destroy forensic evidence.
✓
Modify the security group to deny outbound traffic
Why this is correct
This stops the malicious activity while preserving the instance for investigation.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Standard ACLs match source addresses.
✗
Create an AMI of the instance for analysis
Why it's wrong here
Creating an AMI is good for forensics but does not stop the scanning.
✗
Detach the instance from the VPC
Why it's wrong here
Detaching from VPC is not a standard AWS operation; you would change the security group.

Common exam traps

Common exam trap: ACLs stop at the first match

ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.

Detailed technical explanation

How to think about this question

ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.

KKey Concepts to Remember

Standard ACLs match source addresses.
Extended ACLs can match source, destination, protocol and ports.
The first matching ACL entry is used.
There is usually an implicit deny at the end.

TExam Day Tips

Check inbound versus outbound direction.
Read the ACL from top to bottom.
Look for a broader permit or deny above the intended line.

Key takeaway

ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.

Real-world example

How this comes up in practice

A security team runs a vulnerability scan on a web application and discovers an unpatched SQL injection flaw. The team prioritises remediation by CVSS score — critical flaws are patched within 24 hours, high within 7 days. Questions like this test whether you understand vulnerability management processes, scanning tools, and remediation prioritisation.

What to study next

Got this wrong? Here's your next step.

Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related CCSP ACL questions on filtering logic and placement.

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FAQ

Questions learners often ask

What does this CCSP question test?

Cloud Security Operations — This question tests Cloud Security Operations — Standard ACLs match source addresses..

What is the correct answer to this question?

The correct answer is: Modify the security group to deny outbound traffic — Modifying the instance's security group to deny all outbound traffic is a quick and reversible containment action that stops the scanning.

What should I do if I get this CCSP question wrong?

Are there clue words in this question I should notice?

Yes — watch for: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.

What is the key concept behind this question?

Standard ACLs match source addresses.

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Last reviewed: Jul 4, 2026

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