Your organization has been hit with multiple targeted network attacks over the last few months resulting in two data breaches. To attempt to discover how the attackers are getting into your systems, you set up a few vulnerable virtual machines with fake data on them that look like the organization$$s real machines. What defense mechanism have you built?

Choose one $10$ points

A honeynet

Passive sensors

Network$-$based intrusion detection system $($NIDS$)$

DMZ