Which of the following will result in an interface with an err-disabled state?
A) There is a speed mismatch between the router and switch.
B) The router interface has been configured with the shutdown interface subcommand.
C) The neighboring switch port uses port security.
D) The router has cable pinouts that are incorrect.
C
Explanation: C) All of these can result in a down/down state, but only the use of port security on the neighboring switch will put the neighboring switch's port in err-disabled state.
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