-- Exhibit
-- Exhibit --
Refer to the exhibit.
A pair of LTM devices are deployed in a high-availability (HA) pair as the diagram shows. After inserting a new rule on the firewalls, the LTM devices become
Standby. The rule drops all outbound sessions to the Internet. Only inbound connections are allowed from the Internet. There are no other changes to the environment.
What triggered the LTM device failover?
The rule that dropped all outbound sessions to the Internet would prevent the LTM devices from sending traffic to the default gateway address. The configuration shows that each LTM pool has a 'gateway-failsafe-device' configured and uses an ICMP monitor to check the gateway's availability. If the LTMs cannot ping the gateway due to the firewall rule blocking outbound traffic, this would trigger the gateway-failsafe mechanism, causing both LTM devices to go into a standby mode. Therefore, the trigger for the failover is the Gateway Failsafe mechanism.
D - Correct