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Based on the system performance output provided, the memory usage on the FortiGate device is at 90%, which is above the green threshold (82%) but below the red threshold (88%). Given this high memory usage, the FortiGate device will enter "conserve mode" to prevent further resource exhaustion. In conserve mode:

B. FortiGate has entered conserve mode:When the memory usage reaches or exceeds certain thresholds (in this case, the green and red thresholds), the FortiGate enters conserve mode to protect itself from running out of memory entirely. This mode limits some functionalities to reduce memory usage and avoid a potential system crash.

D. Administrators can access FortiGate only through the console port:During conserve mode, administrative access might be restricted, and administrators may only be able to connect to the device via the console port. This restriction is in place to ensure that the FortiGate can be managed directly, even under low resource conditions.

The other options are not correct:

A. FortiGate will start sending all files to FortiSandbox for inspection:This is unrelated to memory usage and conserve mode.

C. Administrators cannot change the configuration:While access may be limited, configuration changes can still be made via the console port.

References

FortiOS 7.4.1 Administration Guide -Monitoring System Resources and Performance, page 325.

FortiOS 7.4.1 Administration Guide -Conserve Mode, page 330.

When a firewall policy is created in FortiGate integrated with FortiAnalyzer and FortiManager, a Universally Unique Identifier (UUID) is added to the policy to support logging and management​.

To disable RPF (Reverse Path Forwarding) checking on a FortiGate interface, you need to disable the src-check option in the interface settings. This action disables the RPF check, allowing traffic to bypass the verification that it is arriving on the correct interface based on the routing table.

The On Demand mode for Dead Peer Detection (DPD) on FortiGate sends DPD probes only when there is outbound traffic and no response from the peer. This mode is used to detect if the peer is still available without continuously sending DPD probes, reducing unnecessary traffic.

By default, DNS queries to FortiGuard servers use UDP port 53.

When using FortiGuard servers for DNS, FortiOS uses DNS over TLS (DoT) by default to secure the DNS traffic. New FortiGuard DNS servers have been added as primary and secondary servers.

The routing table in the exhibit shows two default routes (0.0.0.0/0) with different administrative distances:

The default route throughport2has an administrative distance of 20.

The default route throughport1has an administrative distance of 10.

Administrative distance determines the priority of the route; a lower value is preferred. Here, the route throughport1with an administrative distance of 10 is the preferred route. The route throughport2with an administrative distance of 20 acts as a standby or backup route. If the primary route (port1) fails or is unavailable, traffic will then be routed throughport2.

Regarding the statement that the port2 interface is marked as inactive, there is no indication in the routing table thatport2is inactive. Similarly, all the routes displayed are not necessarily installed in the FortiGate routing table, as the table could include both active and backup routes.

References:

FortiOS 7.4.1 Administration Guide: Default route configuration

FortiOS 7.4.1 Administration Guide: Routing table explanation

If fortigate is used as an SSL VPN client, it needs a ssl virtual tunnel interface to connect to the SSL VPN server. This is the client virtual interface that the vpn server will assign the temporary IP address toduring the lifetime of an ssl connection. The SSL VPN server also needs a correct CA certificate to authenticate/trust client's certificate.

With override enabled, the primary unit with the highest device priority will always become the primary unit. Whenever an event occurs that may affect primary unit selection, the cluster negotiates. For example, when override is enabled a cluster renegotiates when you change the device priority of any cluster unit or when you add a new unit to a cluster. Override and primary unit selection Enabling override changes the order of primary unit selection. As shown below, if override is enabled, primary unit selection considers device priority before age and serial number. This means that if you set the device priority higher on one cluster unit, with override enabled this cluster unit becomes the primary unit even if its age and serial number are lower than other cluster units.https://docs.fortinet.com/document/fortigate/6.0.0/handbook/123439/primary-unit-selection-with-override-enabled

The CA=True value identifies the certificate as a CA certificate. The KryUsage =KeyCertSign value indicates that the certificate corresponding private key is permitted to sign certificates. see RFC 5280 section 4.2.1.9 basic Constraints.