A.ping
B.trace
C.nslookup
D.ipconfig

A.ping
B.trace
C.nslookup
D.ipconfig

A.httpwatch
B.pingplotter
C.wireshark
D.dig

A.httpwatch
B.pingplotter
C.wireshark
D.dig

A.接口松动
B.连接器件老化
C.尾纤老化
D.光纤弯曲过大

A.B端接头损坏
B.B端网线第2根接线问题
C.B端网线第3根接线问题
D.B端网线第4根接线问题

A.0db
B.-10db
C.-20db
D.-30db

A.加光衰
B.换备用光纤
C.换接头
D.换转换器

A.850nm
B.1310nm
C.1490nm
D.1550nm

A.多模光纤
B.单模光纤
C.双纤线
D.同轴电缆

A.0dB
B.-2db
C.-7db
D.-25db