What are the three ways to obtain an IP address on a FortiGate device?

Obtaining an IP address on a FortiGate device can be achieved through three primary methods: manual configuration, Dynamic Host Configuration Protocol (DHCP), and Point-to-Point Protocol over Ethernet (PPPoE).

Manual configuration allows the network administrator to directly assign a specific IP address to the FortiGate device. This method provides control over the network address, ensuring the device has the correct IP configuration.

DHCP enables the FortiGate to automatically receive an IP address from a DHCP server within the network. This method simplifies network management by automatically assigning IP addresses without requiring manual configuration for each device.

PPPoE is a network protocol that allows a connection over Ethernet while providing authentication, which is commonly used by ISPs for broadband connections. It enables the FortiGate device to connect to the Internet through a broadband modem, often requiring a username and password for authentication.

The other options listed include various combinations of methods that might not accurately reflect common practices in configuring IP addresses on FortiGate devices. For example, while BOOTP is a legacy protocol similar to DHCP, it is not widely used in modern configurations, thus making it less relevant compared to the listed methods.