单选题When is a first-hop redundancy protocol needed in the distribution layer？（）A when the design implements Layer 2 between the access arid distribution blocksB when multiple vendor devices need to be supportedC when preempt tuning of the default gateway is neededD when a robust method of backing up the default gateway is neededE when the design implements Layer 2 between the access switch and the distribution blocksF when the design implements Layer 2 between the access and distribution blocks
单选题
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
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