When you connect each switch independently to the router, there will be a broadcast domain for each switch, thus controlling the broadcast traffic passing through your network.
Transmission fluid is a slippery liquid that acts as a lubricant for all of the moving parts inside your transmission. In an automatic transmission, this fluid also serves as a coolant and a viscous fluid that transmits power from the engine to the transmission. A variety of fluids are used for different transmissions.
1 happens when the transmission is shifted to neutral or park, and also happens (either explicitly or implicitly) when the engine is turned off. The only time anything bad happens from 2 is if the car is actually moving when you do it - the parking awl is damned strong, but no part is wholly immune to breakage. tldr;