The ability to detect a target computer's Operating system is very valuable to an attacker.
Explanation:
Computers are always prone to the attacks of hackers and privacy invaders. The hackers use different methods to hack into another person's computer to sabotage the system. If an attacker gets to know about the operating system of the target computer, it is easy for him to select and apply the methods suitable to invade the targeted computer system. HE can know about the type of firewall based on the operating system which can help him in so many ways.
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