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ECCouncil Certified Ethical Hacker Exam (CEHv13) Sample Questions:
1. You are Riley, an incident responder at NovaEx Crypto in San Antonio, Texas, tasked with investigating a recent double-spend reported by a retail merchant that accepts the exchange ' s token. Your telemetry shows that a reseller node used by the merchant received blocks only from a small, fixed set of peers for several hours and accepted a conflicting history that later allowed the attacker to reverse a confirmed payment. The attacker appears to have controlled which peers that node communicated with and supplied it a private chain until they were ready to reveal it. Which blockchain attack does this behavior most closely describe?
A) 51% Attack
B) Finney Attack
C) DeFi Sandwich Attack
D) Eclipse Attack
2. A large chemical plant uses operational technology (OT) networks to control its industrial processes.
Recently, abnormal behavior is observed from PLCs, suggesting a stealthy compromise via malicious firmware. Which action should the team take FIRST to verify and neutralize the issue?
A) Immediately isolate suspicious devices
B) Perform detailed inspections of device software for unauthorized modifications
C) Implement enhanced IDS rules
D) Restrict remote administrative access
3. During a security assessment, an attacker identifies a flaw in a multi-user file system. The system first verifies access rights to a temporary file created by a user. However, immediately after this verification, and before the file is processed, the attacker manages to swap the original file with a malicious version. This manipulation happens in the brief interval between the system ' s access verification and the moment it handles the file, resulting in the malicious file being treated as legitimate. Which vulnerability is the attacker exploiting?
A) Integer overflow during arithmetic computations with limited memory bounds.
B) Improper certificate validation in trusted communication channels.
C) Null pointer dereference leading to unexpected application behavior.
D) Time-of-validation/time-of-execution issue in resource management logic.
4. As part of a penetration test for a financial firm's smart headquarters in Denver, Colorado, ethical hacker Jordan Lee begins evaluating the IoT infrastructure responsible for lighting, HVAC, and badge-controlled access. Jordan documents details such as device models, manufacturer names, firmware versions, and supported protocols like Zigbee and BLE. This information is used to understand the device ecosystem.
Which step of the IoT hacking methodology is being carried out in this phase?
A) Vulnerability scanning
B) Information gathering
C) Gain remote access
D) Launch attacks
5. At Apex Financial Services in Houston, Texas, ethical hacker Javier Ruiz evaluates mobile security practices under the company ' s BYOD policy. He demonstrates that employees often install applications that request access to contact lists, cameras, and messaging services, even though these functions are unrelated to the apps
' intended purpose. This behavior allows a malicious program to harvest sensitive corporate information.
Which security guideline would most directly prevent this issue?
A) Set passwords for apps to restrict others from accessing them
B) Use encryption mechanisms to store data
C) Enforce automatic device locking or implement biometric authentication
D) Review permissions requested by apps before installing them
Solutions:
| Question # 1 Answer: D | Question # 2 Answer: B | Question # 3 Answer: D | Question # 4 Answer: B | Question # 5 Answer: D |
