An administrator has to determine host operating systems on the network and has deployed a
transparent proxy. Which of the following fingerprint types would this solution use?
A.
Packet
B.
Active
C.
Port
D.
Passive
Explanation:
TCP/IP stack fingerprinting is the passive collection of configuration attributes from a remote
device during standard layer 4 network communications. The combination of parameters may then
be used to infer the remote machine’s operating system (aka, OS fingerprinting), or incorporated
into a device fingerprint.Certain parameters within the TCP protocol definition are left up to the implementation. Different
operating systems and different versions of the same operating system set different defaults for
these values. By collecting and examining these values, one may differentiate among various
operating systems, and implementations of TCP/IP. Just inspecting the Initial TTL and window
size TCP/IP fields is often enough in order to successfully identify an operating system, which
eases the task of performing manual OS fingerprinting.
Passive OS fingerprinting is the examination of a passively collected sample of packets from a
host in order to determine its operating system platform. It is called passive because it doesn’t
involve communicating with the host being examined.
In this question, the proxy will use passive fingerprinting because the proxy is a ‘transparent
proxy’. It isn’t seen by the computer.
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