Which information does FortiSASE use to bring network lockdown into effect on an endpoint?

The Network Lockdown feature in FortiSASE is a specialized security control designed to ensure that managed endpoints remain protected by the SASE security stack at all times.

Mechanism of Action: Network lockdown relies specifically on the connection status of the tunnel to FortiSASE. When this feature is enabled in the Endpoint Profile, the FortiClient agent monitors whether the secure VPN tunnel (SSL or IPsec) to a FortiSASE Point of Presence (PoP) is active.

Enforcement Logic: If the agent detects that the tunnel is disconnected, it immediately places the endpoint's network interface into a "locked" state. In this state, all inbound and outbound network traffic is blocked, with the exception of traffic required to re-establish the connection to the FortiSASE infrastructure.

Purpose: This prevents "leakage" where an endpoint might communicate directly with the internet without inspection if the VPN tunnel drops or is manually disabled by the user. It essentially mandates that the device is either connected to FortiSASE or has no network access at all.

Analysis of Incorrect Options:

Option A and B: While malware and vulnerabilities affect the security posture, they trigger different remediation actions (like quarantine or patching) rather than the "Network Lockdown" tunnel-state feature.

Option D: ZTNA tags identify the security posture to allow or deny access to specific applications, whereas Network Lockdown is a binary state (On/Off) affecting all network traffic based purely on tunnel connectivity.