单选题
When is a first-hop redundancy protocol needed in the distribution layer？（）
发布日期：2020-04-11
when the design implements Layer 2 between the access arid distribution blocks
when multiple vendor devices need to be supported
when preempt tuning of the default gateway is needed
when a robust method of backing up the default gateway is needed
when the design implements Layer 2 between the access switch and the distribution blocks
when the design implements Layer 2 between the access and distribution blocks
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