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多项选择题What are two characteristics of dual-ring interconnect in SONET networks? ()(Choose two.)

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.

  • A,D
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