单项选择题

What is a global command?（）

A. A command that is available in every release of IOS, regardless of the version or deployment status.
B. A command that can be entered in any configuration mode.
C. A command that is universal in application and supports all protocols.
D. A command that is implemented in all foreign and domestic IOS version.
E. A command that is set once and affects the entire router.

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What feature of a networks switch allows an administrative to create separate broadcast domains?（）

A. Store-and-forward switching
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Which of the following options lists the steps in PPP session establishment in the correct order?（）

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E. Link establishment phase, optional authentication phase, network layer protocol phase.
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