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单项选择题When is a first-hop redundancy protocol needed in the distribution layer?()

A、 when the design implements Layer 2 between the access arid distribution blocks

B、 when multiple vendor devices need to be supported

C、 when preempt tuning of the default gateway is needed

D、 when a robust method of backing up the default gateway is needed

E、 when the design implements Layer 2 between the access switch and the distribution blocks

F、 when the design implements Layer 2 between the access and distribution blocks

  • F
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