后生结核
PLC的输入与输出最好分开走线，开关量与模拟量也要分开敷设。模拟量信号的传送应采用屏蔽线，屏蔽层应一端或两端接地，接地电阻应小于屏蔽层电阻的（） ["1\/2","1\/10","1\/5","1\/100"]
Which IOS features are used to avoid Routing loops when dynamic Routing protocols are used betweenPE and CE in MPLS-VPN networks？（） ["Site Of Origin SOO.","SHAM links with OSPF","BGP cost community","BGP feature allow-as in","RPF Reverse Path forwarding.","Access-list Control in Distance Vector protocol like RIP and EIGRP."]
What authentication type is used by SNMPv2?（） ["HMAC-MD5","HMAC-SHA","CBC-DES","community string"]
满载与无载最大运行速度
课程组织的顺序性
