Which technology prevents unauthorized access to network resources by inspecting incoming and outgoing traffic and allowing or blocking it according to predefined security rules?
Virtual Private Network
Intrusion Detection System
Firewall
Security Information and Event Management system
A firewall establishes a barrier between trusted and untrusted networks. By evaluating packets against configured security rules, it decides whether to allow or block traffic, thereby preventing unauthorized access. Intrusion detection systems only alert, VPNs encrypt traffic but do not enforce rule-based filtering, and SIEMs aggregate logs without directly controlling traffic.
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