This has to do with the drivetrain of the car. In simpler terms, the power delivery system of the car. A 2wd or a two wheel drive is any general stick shift(manual transmission) car you drive. Either the front two rotates and pull your car or the back two rotates and push your car forward. For a 4wd or a four wheel drive, you can switch to all of the wheels being driven. Provides better grip on the road.
How the system works. Active Noise Cancellation (ANC) is designed to dramatically reduce low frequency noise in the interior. The system operates whenever the car is running, regardless of whether the audio system is on or off. There are two microphones in the cabin area.
Configuration changes on the active unit are automatically updated to the standby unit. This happens internally to the Catalyst. If you swap standby modules, the active Supervisor automatically ensures that the standby gets a copy of the current configuration.It updates the configuration file in the standby unit.TIP. Remember that any redundant Supervisor module you insert into the Catalyst acquires the configuration of the operating active Supervisor module. Do not insert a module with an updated configuration file and expect it to modify the active unit.You lose your updated file.he standby always synchronizes to the active. When using Catalyst 5000 Supervisor Engine III modules and all Catalyst 6000 modules, additional elements are compared between the active and standby engines. Specifically, the active module compares not just the boot image, but also the run-time image.