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單項(xiàng)選擇題

In the Cisco IOS, what is the definition of a global command?()

A. A command that can be entered in any configuration mode.
B. A command that supports all protocols.
C. A command that is implemented in all IOS versions.
D. A command that is set once and affects the entire router.
E. A command that is available in every release of IOS.

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