Final answer:
The command config system interface is used to modify interface settings in network devices and the set preserve-session-route command is used to preserve session routes for a specific interface.
Step-by-step explanation:
The subject of this question is Computers and Technology and the grade level is High School.
The command config system interface is used in network device configuration to modify interface settings. The specific command set preserve-session-route [enable | disable] is used to preserve session routes for a specific interface. This means that when this feature is enabled, session routes will be preserved even if the interface goes down and then comes back up.For example, if interface A is connected to interface B and the link between them goes down for a moment, the session routes between them may be lost. However, if the preserve-session-route feature is enabled on interface A, the session routes will be preserved and automatically restored when the link comes back up.