Which of the following techniques is used when a system performs the penetration testing with the objective of accessing unauthorized information…

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 application.

Answer D is incorrect. Phreaking is a process used to crack the phone system. The 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).

Answer A is incorrect. It is defined as a system using a physical attribute for authenticating. Only

authorized users are provided access

to network or application.

Answer B is incorrect. It is described as a form of eavesdropping in which special equipments are

used to pick up the telecommunication

signals or data within a computer device.