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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By default, which JUNOS software routing table contains IPv6 unicast routes?（）

A.inet.6
B.ipv6.0
C.inet0
D.inet6.0

单项选择题

What is the purpose of IS-IS level boundaries?（）

A. Restrain the formation of adjacencies.
B. Control the flooding scope of link-state PDUs.
C. Partition the L2 backbone into multiple domains.
D. Aggregate L1 domains into a contiguous backbone.

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Which mechanism accommodates the use of overlapping addresses in 2547bis VPNs?（）

A. policies
B. route origins
C. route targets
D. route distinguishers