The answer is to enable IMDSv2 with a hop limit of 1 on the EC2 instance, as this directly blocks SSRF-based credential theft. By requiring a session-oriented PUT request to obtain a token, IMDSv2 prevents attackers from tricking the instance into leaking its IAM role credentials through a simple GET request, while the hop limit of 1 ensures the metadata response cannot be forwarded beyond the instance’s own network interface. On the Certified Cloud Security Professional CCSP exam, this scenario tests your understanding of defense-in-depth for instance metadata, often appearing as a trap where candidates mistakenly choose network ACLs or security groups—which cannot control application-layer SSRF attacks. Remember the key distinction: IMDSv1 is vulnerable to any process on the instance, but IMDSv2 with hop limit 1 forces the attacker to have direct, local execution access. Memory tip: “Hop 1 stops the hop—no token, no theft.”
CCSP Cloud Security Operations Practice Question
This CCSP practice question tests your understanding of cloud security operations. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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 cloud security team is investigating a data breach in their AWS environment. The logs show that an EC2 instance with an attached IAM role was compromised. The attacker used the instance's temporary credentials to access an S3 bucket containing sensitive data. Which design change would BEST prevent this type of attack in the future?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable IMDSv2 with a hop limit of 1 on the EC2 instance.
Option B is correct because enabling IMDSv2 with a hop limit of 1 forces the EC2 instance to use a session-oriented method to retrieve temporary credentials from the Instance Metadata Service (IMDS). This prevents SSRF attacks or other techniques that trick the instance into leaking its IAM role credentials, as the attacker would need to be on the instance itself to obtain the token. By setting the hop limit to 1, the metadata response is not forwarded beyond the instance's network interface, blocking remote access to the credentials.
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.
✗
Implement a network ACL that denies all outbound traffic from the EC2 instance to the S3 service.
Why it's wrong here
Network ACLs cannot restrict IAM role-based access to S3.
✓
Enable IMDSv2 with a hop limit of 1 on the EC2 instance.
Why this is correct
IMDSv2 with hop limit 1 prevents the attacker from using the instance as a proxy to retrieve credentials.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Restrict S3 bucket access to the EC2 instance's private IP address only.
Why it's wrong here
IP-based restrictions do not prevent credential theft from the instance.
✗
Disable public access on the S3 bucket using a bucket policy.
Why it's wrong here
Public access settings do not prevent authorized IAM role access.
Common exam traps
Common exam trap: answer the scenario, not the keyword
ISC2 often tests the distinction between IMDSv1 (which is vulnerable to SSRF) and IMDSv2 with hop limit enforcement, and the trap here is that candidates mistakenly choose network-level controls (like NACLs or IP restrictions) instead of addressing the metadata service vulnerability that directly enables credential theft.
Detailed technical explanation
How to think about this question
IMDSv2 introduces a token-based flow where the instance must first make a PUT request to http://169.254.169.254/latest/api/token to obtain a session token, which is then used in subsequent GET requests for metadata. The hop limit of 1 ensures that packets with a Time-to-Live (TTL) of 1 are not forwarded by routers or intermediate devices, so only the local instance can reach the metadata endpoint. In a real-world SSRF attack, an attacker exploits a vulnerable web application on the instance to make requests to the metadata IP; with IMDSv2 and hop limit 1, the token request would fail because the attacker's crafted request would have a TTL decremented below 1 before reaching the metadata service.
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 SOC analyst notices unusual lateral movement in the network at 2 AM. The IR playbook dictates: identify and contain (isolate the affected machine), then eradicate (remove the malware), then recover (restore from backup), then document. Skipping containment before eradication risks the attacker regaining access. Questions like this test the sequence and rationale of incident response phases.
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.
Cloud Security Operations — This question tests Cloud Security Operations — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Enable IMDSv2 with a hop limit of 1 on the EC2 instance. — Option B is correct because enabling IMDSv2 with a hop limit of 1 forces the EC2 instance to use a session-oriented method to retrieve temporary credentials from the Instance Metadata Service (IMDS). This prevents SSRF attacks or other techniques that trick the instance into leaking its IAM role credentials, as the attacker would need to be on the instance itself to obtain the token. By setting the hop limit to 1, the metadata response is not forwarded beyond the instance's network interface, blocking remote access to the credentials.
What should I do if I get this CCSP 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: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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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