Quick Answer

The answer is that the anomaly sensor is not actually applied, and the 'pass' action shown in the 'diagnose ips anomaly list' output indicates default entries rather than the configured sensor. This is correct because when a custom IPS anomaly sensor for 'tcp_syn_flood' is properly attached to a firewall policy, the action for that anomaly should reflect the administrator's configuration—typically 'block'—not the default 'pass'. The connectivity issues reported are likely unrelated to IPS, and the administrator should first verify the sensor is actually applied to the policy, as the list only shows built-in defaults. On the Fortinet NSE 4 exam, this question tests your understanding of how IPS anomaly sensors are applied and how to verify their activation using CLI diagnostics; a common trap is assuming any entry in the anomaly list means the sensor is active. Remember the memory tip: "If it shows 'pass', the sensor didn't last"—meaning a 'pass' action in the anomaly list usually means the custom sensor hasn't been applied.