Which interface types should be used to configure link monitoring for a high availability (HA)...

When configuring link monitoring for high availability (HA) on a Palo Alto Networks NGFW, the following interface types are supported:

Virtual Wire: Used when you have a transparent mode firewall deployment, where the firewall operates at Layer 2 to monitor traffic between two network segments.

Layer 2: Also used in transparent mode, where the firewall operates as a Layer 2 device and can be configured for link monitoring.

Layer 3: Used in routed mode, where the firewall is involved in routing traffic and can also be configured to monitor links.