What is the difference between passive and active IDSs?
What will be an ideal response?
IDSs are categorized by how they react when they detect suspicious behavior. Systems that don't take any action to stop or prevent an activity are called passive systems. They do, of course, send out an alert and log the activity,much like an underpaid security guard at a shopping mall witnessing an armed robbery. Active systems also log events and send out alerts, but they can also interoperate with routers and firewalls. For example, an active IDS can send an access list to a router that closes an interface to prevent attackers from damaging the network.
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