单项选择题
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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A.inet.6
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What is the purpose of IS-IS level boundaries?（）
A. Restrain the formation of adjacencies.
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单项选择题
Which mechanism accommodates the use of overlapping addresses in 2547bis VPNs?（）
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