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思科认证考试

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On an ONS 15454 node you can tunnel a(n) ().

  • A、 SDH circuit over a SONET network delivering it as an SDH signal
  • B、 SDH circuit over a SONET network delivering it as a SONET signal
  • C、 SONET circuit over an SDH network delivering it as an SDH signal
  • D、 SONET circuit over an SDH network delivering it as a SONET signal
正确答案:A
答案解析:
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