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Which mechanism does External BGP use to prevent the formation of routing loops?（）
- A、AS path
- B、Split horizon
- C、Poison reverse
- D、Unicast RPF check
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单选题Which mechanism does External BGP use to prevent the formation of routing loops?（）A
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It splits the LS Update packet into smaller packets.C
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direct modeB
round robinC
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No algorithm is used.
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