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多选题
What are two characteristics of dual-ring interconnect in SDH networks？ （）
A
It protects signals against node failures between rings.
B
It protects signals against node failure within a single ring.
C
It allows for traffic to be preempted when a ring switch occurs.
D
Traffic can be dropped and continued at interconnecting nodes.
E
It protects preemptible traffic from being dropped when a ring switch occurs.
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