Certified Ethical Hacker (CEH v13) — Question 107

Henry is a cyber security specialist hired by BlackEye – Cyber Security Solutions. He was tasked with discovering the operating system (OS) of a host. He used the Unicornscan tool to discover the OS of the target system. As a result, he obtained a TTL value, which indicates that the target system is running a Windows OS. Identify the TTL value Henry obtained, which indicates that the target OS is Windows.

Answer options

• A. 128
• B. 255
• C. 64
• D. 138

Correct answer: A

Explanation

The TTL value of 128 is commonly associated with Windows operating systems, indicating that the target is running on Windows. The other TTL values, such as 255, are typically used by other operating systems like Cisco routers, while 64 and 138 are often linked to Linux and other Unix-based systems, making them incorrect in this context.