In a Cisco system, which of the following issues may NOT cause a down/down state on an interface?
A) There is a speed mismatch between the router and switch.
B) The router has no cable installed.
C) The neighboring switch port uses port security.
D) The router has cable pinouts that are incorrect.
D
Explanation: D) Cisco switches use auto-mdix that can detect some incorrect cabling pinouts and internally change the pin logic so the interface may not fail.
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