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
  3% (2)
• B
  89% (55)
• C
  2% (1)
• D
  6% (4)

Explanation

128 is the TTL value that Henry obtained, which indicates that the target OS is Windows. TTL (Time to Live) is a field in the IP (Internet Protocol) header that specifies how long a packet can remain in a network before it is discarded or dropped. TTL is usually expressed in seconds or hops (the number of routers or gateways that a packet passes through). TTL is used to prevent packets from looping endlessly in a network or consuming network resources.Different operating systems have different default TTL values for their packets. By observing the TTL value of a packet from a target system or network, one can infer the operating system of the target.Some common TTL values and their corresponding operating systems are: 64: Linux, Unix, Android In the scenario, Henry used Nmap tool to discover the OS of the target system. Nmap (Network Mapper) is a tool that can perform various network scanning and enumeration tasks, such as port scanning, OS detection, service identification, etc.Nmap can use various techniques to detect the OS of a target system, such as TCP/IP fingerprinting, which involves analyzing various TCP/IP characteristics of packets from the target system, such as TTL value. In the scenario, Henry obtained a TTL value of 128 , which indicates that the target OS is Windows.

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