Answer:
Passive Wiretap
Explanation:
Wiretapping is the preferred method of obtaining intelligence (for quality reasons), it involves tying into a wire or other conductor that is used for communications. This wire can be a telephone line, a PBX cable, a local area network, a CCTV video system, an alarm system, or any other communications medium. The goal in a wiretapping is to secure high quality information, and to minimise the possibility of the eavesdropping being detected (remember radiated signals are easy to detect).
Passive Wiretapping is a type of wiretapping that is not active but rather attempts merely to observe the traffic flow to gain desired knowledge, but does not alter or otherwise affect that flow.
