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單項(xiàng)選擇題

What is  the default metric used on IS -IS routers for each interface?()

A. The cost is set to 10 for all interfaces.
B. The cost is set to 10 for LAN interfaces and 20 for WAN interfaces.
C. The cost is based on the speed of the interface.
D. The cost is based o n a composite of bandwidth and delay of the interface.

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