A node directly below node n in a tree is called a ______ of node n.

________ refers to the process of testing the organization's security posture using similar techniques and tools as those of an attacker, but with the knowledge and approval of the organization.

A Recon-ng B Maltego C Social engineering D Penetration testing (pen testing)

Network _________ enables a computer to see other devices on a network and determines whether that computer can be seen by others.

Fill in the blank(s) with the appropriate word(s).