Which tool can be used to identify the target's operating system by observing TTL values in the results?

Which tool can be used to identify the target's operating system by observing TTL values in the results?

• A. Nmap Scripting Engine (NSE)
• B. Unicornscan
• C. Wireshark
• D. Netcat

Answer: (B)

TTL fingerprinting relies on the fact that different operating systems use different default initial TTL values for outgoing packets. When a response comes back, the observed TTL is the initial TTL minus the number of hops the packet traveled. By examining this TTL (and related response traits), you can make a best guess about the target’s OS. Unicornscan is designed to perform active scans and report OS information based on such TTL observations in its results, making it well suited to identifying the target’s operating system from TTL data. While a packet analyzer like Wireshark can show TTL values, it doesn’t automatically translate them into an OS guess. Netcat is a general tool for sending and receiving data, not for OS fingerprinting. The scripting framework in Nmap (NSE) enables OS detection through Nmap’s engine, but TTL-based OS identification is specifically a capability highlighted in Unicornscan’s scanning approach, which is why it’s the best fit here.

TTL fingerprinting relies on the fact that different operating systems use different default initial TTL values for outgoing packets. When a response comes back, the observed TTL is the initial TTL minus the number of hops the packet traveled. By examining this TTL (and related response traits), you can make a best guess about the target’s OS.

Unicornscan is designed to perform active scans and report OS information based on such TTL observations in its results, making it well suited to identifying the target’s operating system from TTL data. While a packet analyzer like Wireshark can show TTL values, it doesn’t automatically translate them into an OS guess. Netcat is a general tool for sending and receiving data, not for OS fingerprinting. The scripting framework in Nmap (NSE) enables OS detection through Nmap’s engine, but TTL-based OS identification is specifically a capability highlighted in Unicornscan’s scanning approach, which is why it’s the best fit here.