The answer is that the customer is responsible for configuring access controls and permissions. Under the AWS shared responsibility model, security of the cloud falls to AWS, but security in the cloud—including S3 bucket policies, IAM roles, and public access settings—is entirely the customer’s duty. An S3 bucket misconfiguration like making ‘acme-backups’ publicly readable is a classic customer-side failure, not an infrastructure vulnerability. On the Certified Ethical Hacker CEH exam, this concept tests your ability to distinguish between cloud provider and client obligations, often appearing in scenario-based questions where a misconfigured bucket leads to data exposure. A common trap is assuming AWS automatically blocks public access; in reality, default settings may allow it unless explicitly restricted. Remember the mnemonic “AWS handles the floor, you lock the door”—the provider secures the physical and network layer, but you must manage every permission on your data.
CEH Practice Question: Advanced Topics: Wireless, Cloud, IoT, Cryptography
This CEH practice question tests your understanding of advanced topics: wireless, cloud, iot, cryptography. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 engineer discovers that an S3 bucket named 'acme-backups' is accessible to anyone with the bucket URL. The bucket contains sensitive customer data. Which AWS shared responsibility model component does this misconfiguration primarily violate?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The customer is responsible for configuring access controls and permissions
Under the AWS shared responsibility model, the customer is responsible for configuring S3 bucket policies and access controls. The misconfiguration is a customer-side issue, not an infrastructure vulnerability.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
AWS is responsible for physical security of data centers
Why it's wrong here
Physical security is AWS's responsibility but unrelated to S3 bucket misconfiguration.
✗
The customer is responsible for patching the S3 service
Why it's wrong here
AWS handles patching of S3; the customer configures access policies.
✓
The customer is responsible for configuring access controls and permissions
Why this is correct
Correct. S3 bucket policies and permissions are customer-managed security controls.
Related concept
Static NAT maps one inside address to one outside address.
✗
AWS is responsible for network infrastructure; the customer for data classification
Why it's wrong here
While AWS handles infrastructure, the specific misconfiguration is an access control issue that the customer must manage.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CEH question in full detail.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related CEH NAT questions on configuration and troubleshooting.
Advanced Topics: Wireless, Cloud, IoT, Cryptography — This question tests Advanced Topics: Wireless, Cloud, IoT, Cryptography — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: The customer is responsible for configuring access controls and permissions — Under the AWS shared responsibility model, the customer is responsible for configuring S3 bucket policies and access controls. The misconfiguration is a customer-side issue, not an infrastructure vulnerability.
What should I do if I get this CEH question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related CEH NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Question Discussion
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