Junos OS

C

Among the given options, the statement that is true regarding the Junos OS is:

C. All platforms running the Junos OS use the same source code base.

Explanation:

The Junos OS is a network operating system that is used on Juniper Networks' routing, switching, and security devices. This operating system is based on the FreeBSD UNIX operating system and provides a common operating system architecture that supports the implementation of a consistent set of services and features across the entire Juniper Networks routing and switching product line.

Option A is incorrect because factory-default configurations vary depending on the platform and device type.

Option B is incorrect because Junos OS uses the Trio chipset, which provides the longest-match lookup functionality.

Option D is incorrect because FXP1 is a physical interface used for connecting control and forwarding planes on older Juniper Networks' devices, whereas newer devices use a virtual interface called fxp0.

Therefore, the correct statement regarding the Junos OS is that all platforms running the Junos OS use the same source code base, ensuring consistency in the implementation of services and features across Juniper's product line.