Which of the following are the types of OS fingerprinting techniques?

Which of the following are the types of OS fingerprinting techniques? Each correct answer
represents a complete solution. Choose two.

A.
Passive fingerprinting

B.
Active fingerprinting

C.
Laser fingerprinting

D.
Unidirectional fingerprinting

Explanation:
Fingerprinting is the easiest way to detect the Operating System (OS) of a remote system. OS
detection is important because, after knowing the target system’s OS, it becomes easier to hack into
the system. The comparison of data packets that are sent by the target system is done by
fingerprinting. The analysis of data packets gives the attacker a hint as to which operating system is
being used by the remote system.
There are two types of fingerprinting techniques as follows:
1.Active fingerprinting
2.Passive fingerprinting
In active fingerprinting ICMP messages are sent to the target system and the response message of
the target system shows which OS is being used by the remote system. In passive fingerprinting the
such types of OS fingerprinting.