What is the status LED light when the port is in spanning tree protocol blocking state? Is it green , amber or no light?

can mls qos min-reserve command on global configuration mode and wrr-queue work on interface configuration command work on cisco 3560 E series? which IOS version support this?

If use IOS 12.2(25)SEE 4 on catalyst switch 3560G or catalyst switch 3560 or catalyst switch 3500 series XL , is it all the configuration command can work on these 3 switch?

what does the function of the supervisor module on switch do?

how to safely turn off cisco router/switch?is it just turn off the power switch at the back of router/switchor need to issue soem command in user EXEC mode /privileged mode to shut down the router/switch? explain please, thank you