Refer to the exhibits.

Comprehensive and Detailed Explanation From FortiSOAR 7.6., FortiSIEM 7.3 Exact Extract study guide:

Based on the analysis of theTriggering Eventsand theRaw Messageprovided in the FortiSIEM 7.3 interface:

Active Reconnaissance (A):The "Triggering Events" table shows a single source IP (10.200.3.219) attempting to connect to multiple different destination IP addresses (10.200.200.166, .128, .129, .159, .91) on the same service (FTP/Port 21). Each attempt consists of exactly1 Sent Packetand0 Received Packets. This pattern of "one-to-many" sequential connection attempts is the signature of a horizontal port scan, which is a primary technique inActive Reconnaissance.

Destination hosts are not responding (C):The Raw Log shows the action as"timeout"and specifically lists"sentpkt=1 rcvdpkt=0". In FortiGate log logic (which FortiSIEM parses), a "timeout" with zero received packets indicates that the firewall allowed the packet out (Action was not 'deny'), but no SYN-ACK or response was received from the target host within the session timeout period. This confirms the destination hosts are either offline, non-existent, or silently dropping the traffic.

Why other options are incorrect:

FortiGate is not routing (B):If the FortiGate were not routing the packets, the logs would typically not show a successful session initialization ending in a "timeout," or they would show a routing error/deny. The fact that 44 bytes were sent indicates the FortiGate processed and attempted to forward the traffic.

FortiGate is blocking return flows (D):If the return flow were being blocked by a security policy on the FortiGate, the action would typically be logged as"deny"for the return traffic, and the session state would reflect a policy violation rather than a generic session"timeout".