单选题What is the purpose of IS-IS level boundaries?（）ARestrain the formation of adjacencies.BControl the flooding scope of link-state PDUs.CPartition the L2 backbone into multiple domains.DAggregate L1 domains into a contiguous backbone.
单选题
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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