Which of the following is used to serve as an emergency backup line to troubleshoot a broadbandconnection on many routers?（）
- A、DSL
- B、POTS
- C、VDSL
- D、Smart jack
正确答案:B
答案解析:有
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CompTIA认证考试
CompTIA认证考试
Which of the following is used to serve as an emergency backup line to troubleshoot a broadbandconnection on many routers?（）
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