Tremp is an IT Security Manager, and he is planning to deploy an IDS in his small company. He is looking for an IDS with the following characteristics: - Verifies success or failure of an attack…

Gateway-based IDS is not a standard classification; IDS typically operate at the host or network level.

Network-based IDS (NIDS) monitors network traffic but cannot monitor internal host activities, verify attack success on the host, or inspect encrypted traffic, which contradicts Tremp's requirements. NIDS often requires dedicated hardware.

Host-based Intrusion Detection Systems (HIDS) are deployed directly on individual host machines and monitor their internal activities, such as system logs, file integrity, and process execution. This approach allows HIDS to verify attack success/failure, detect attacks within encrypted traffic or from insider threats that network-based systems might miss, provide near real-time response on the host itself, and they utilize existing host resources, thereby avoiding additional hardware costs and offering a lower entry barrier.

Open source-based describes the licensing model, not the deployment type (host vs. network). Both HIDS and NIDS can be open source.