Final answer:
The Network tab in the PAN-OS GUI is where you can find details about the interfaces on a firewall and their physical connections.
Step-by-step explanation:
The PAN-OS GUI tab that contains the information about the interfaces on the firewall and what they're physically connected to is the Network tab. This tab provides a graphical overview of all physical and logical interfaces, including Ethernet, VLAN, loopback, and tunnel interfaces. Users can view and configure their properties, security zones, and virtual routers associated with these interfaces. It is essential to understand the configuration of these interfaces to manage the network's traffic flow effectively and to apply the necessary security policies.