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
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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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
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