You are encountering connectivity problems caused by intermediate devices blocking IPsec traffic.
In which two ways can you effectively resolve the problem? (Choose two.)

Which statement correctly describes NetAPI polling mode for the FSSO collector agent?

A network administrator wants to set up redundant IPsec VPN tunnels on FortiGate by using two IPsec VPN tunnels and static routes.
All traffic must be routed through the primary tunnel when both tunnels are up. The secondary tunnel must be used only if the primary tunnel goes down. In addition, FortiGate should be able to detect a dead tunnel to speed up tunnel failover.
Which two key configuration changes must the administrator make on FortiGate to meet the requirements? (Choose two.)

Refer to the exhibits.
An administrator configured the Web Filter Profile to block access to all social networking sites except Facebook. However, when users try to access Facebook.com, they are redirected to a FortiGuard web filtering block page.
Based on the exhibits, which configuration change must the administrator make to allow Facebook while blocking all other social networking sites?

An administrator wants to configure dead peer detection (DPD) on IPsec VPN for detecting dead tunnels. The requirement is that FortiGate sends DPD probes only when there is no inbound traffic.
Which DPD mode on FortiGate meets this requirement?