To view Compromised Hosts on FortiAnalyzer, certain configurations need to be in place on both FortiGate and FortiAnalyzer. Compromised Host data on FortiAnalyzer relies on log information from FortiGate to analyze threats and compromised activities effectively. Here's why the selected answers are correct:

Option A: Enable device detection on the FortiGate devices that are sending logs to FortiAnalyzer

Enabling device detection on FortiGate allows it to recognize and log devices within the network, sending critical information about hosts that could be compromised. This is essential because FortiAnalyzer relies on these logs to determine which hosts may be at risk based on suspicious activities observed by FortiGate. This setting enables FortiGate to provide device-level insights, which FortiAnalyzer uses to populate the Compromised Hosts view.

Option B: Enable web filtering in firewall policies on FortiGate devices, and make sure these logs are sent to FortiAnalyzer

Web filtering is crucial in identifying potentially compromised hosts since it logs any access to malicious sites or blocked categories. FortiAnalyzer uses these web filter logs to detect suspicious or malicious web activity, which can indicate compromised hosts. By ensuring that FortiGate sends these web filtering logs to FortiAnalyzer, the administrator enables FortiAnalyzer to analyze and identify hosts engaging in risky behavior.

Let's review the other options for clarity:

Option C: Make sure all endpoints are reachable by FortiAnalyzer

This is incorrect. FortiAnalyzer does not need direct access to all endpoints. Instead, it collects data indirectly from FortiGate logs. FortiGate devices are the ones that interact with endpoints and then forward relevant logs to FortiAnalyzer for analysis.

Option D: Subscribe FortiAnalyzer to FortiGuard to keep its local threat database up to date

Although subscribing to FortiGuard helps keep threat intelligence updated, it is not a requirement specifically to view compromised hosts. FortiAnalyzer primarily uses logs from FortiGate (such as web filtering and device detection) to detect compromised hosts.