Certified Ethical Hacker (CEH v12) — Question 84

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 correct TTL value for a Windows OS is 128, as it is the default value set by Microsoft. The other values, such as 64 and 255, are typical for Unix/Linux systems, while 138 is not a standard TTL value associated with any common operating system.