【简答题】
若拨号不成功，请根据返回的错误信息确定故障，Error619、Error678、Error691、Error769？
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答案
Error619：服务器端没有响应；Error678：局端设备无法同步；Error691：用户名和密码错误；Error769：网卡驱动程序有问题
解析
暂无解析
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【判断题】
纤芯（core），折射率较高，用来传送光,包层（coating），折射率较低，与纤芯一起形成全反射条件；保护套（jacket），强度大，能承受较大冲击，保护光纤。
A. 对
B. 错
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