Which two configuration changes can help optimize memory usage on FortiGate?

Decreasing the session TTL (Time To Live) is a valuable configuration change for optimizing memory usage on FortiGate. The session TTL determines how long a session remains active before it is closed due to inactivity. By reducing the session TTL, older and less active sessions are removed sooner, which can free up memory resources. This helps to ensure that the firewall does not retain unused or stale session data, thus enhancing overall system performance and memory efficiency.

In a network environment where many connections may be established and terminated rapidly, managing memory resources effectively is crucial. A shorter TTL ensures that sessions that are no longer active get cleared out quickly, allowing the FortiGate device to allocate resources more effectively to active connections.

In contrast, increasing the session TTL would have the opposite effect, potentially leading to higher memory usage as inactive sessions remain in the system longer than necessary. Similarly, changes to the FortiGuard cache TTL can influence memory management, but in this context, the focus is specifically on session management related to memory optimization.