Which of the following techniques is used when a system performs the penetration testing with the
objective of accessing unauthorized information residing inside a computer?
A.
Biometrician
B.
Van Eck Phreaking
C.
Port scanning
D.
Phreaking
Explanation:
Port scanning identifies open doors to a computer. Hackers and crackers use this
technique to obtain unauthorized information.
Port scanning is the first basic step to get the details of open ports on the target system. Port
scanning is used to find a hackable server with a hole or vulnerability. A port is a medium of
communication between two computers. Every service on a host is identified by a unique 16-bit
number called a port. A port scanner is a piece of software designed to search a network host for
open ports. This is often used by administrators to check the security of their networks and by
hackers to identify running services on a host with the view to compromising it. Port scanning is
used to find the open ports, so that it is possible to search exploits related to that service and
main aim of phreaking is to avoid paying for long- distance calls. As telephone networks have
become computerized, phreaking has become closely linked with computer hacking. This is
sometimes called the H/P culture (with H standing for Hacking and P standing for Phreaking).described as a form of eavesdropping in which special equipments are used to pick up the
telecommunication signals or data within a computer device.