A system that monitors network use for potential hacking attempts and takes preventative action to block, isolate, or identify attempted infiltration, and raise further alarms to warn security personnel is known as a(n):

Intrusion detection systems

Explanation:

Intrusion detection systems (IDS) are systems designed to monitor network use for any potential hacking or suspicious activity and then take measures to issue alerts upon discovery of such activity. IDS are applications that help secure a network or system from policy breaching or other activities that may be harmful to the network. There are four major types of IDS and they are: Perimeter Intrusion Detection System (PIDS) , Network intrusion detection system (NIDS), VM based Intrusion Detection System (VMIDS), and Host-based intrusion detection system (HIDS) .