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 Unkornscan tool to discover the OS of

Question

Options

• A64
• B128
• C255
• D138

• A
  4% (1)
• B
  88% (22)
• C
  8% (2)

Explanation

TTL Values and OS Fingerprinting Explained

Option B (128) is correct because Windows operating systems use a default Time-To-Live (TTL) value of 128 in their IP packet responses. When tools like Unicornscan perform OS fingerprinting, a TTL response of 128 is a reliable indicator that the target system is running a Windows-based OS.

Why the distractors are wrong:

• A (64) is the default TTL for Linux/Unix systems, not Windows
• C (255) is associated with Cisco/networking devices or older Unix systems (e.g., Solaris)
• D (138) is not a standard default TTL value for any major OS; it may appear if packets have traversed several hops from a Windows machine (128 minus hops), but it is not the default TTL value

Memory Tip: Think of it this way - "Windows = 128, Linux = 64." You can remember this by associating Windows with the larger number (128), since Windows is historically considered a more "heavyweight" OS compared to Linux. Alternatively, remember: "Windows 128" - both W and 128 are associated with a wider, more common desktop environment.

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