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加强开关设备、保护装置的运行维护和检修管理，确保能够快速、可靠地切除故障。（)

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电网应进行合理分区，兼顾供电可靠性和经济性，分区之间要有备用联络线以满足一定程度的负荷互带能力（)

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各种车辆的技术状况应符合国家规定，安全装置完善可靠。（)

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Iftherootbridgefails，configurationBPDUswillnolongerbesent.WhichSTPtimerwillhavetoexpirebeforetheotherswitchescanactivelyrestoreconnectivitywithtopologychangeprocedureofSTP？（）

A. hellotimer
BPDUtimer
C. Forward_delaytimer
D. Max_agetimer
E. Deadtimer
F. Waittimer

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ACompanyisusing6to4tunnelsintheirIPv6network.Whichtwostatementsaretrueaboutthesetunnels？（）

A. Ina6to4tunnel，thefirsttwobytesoftheIPv6addresswillbe0x2002andthenextfourbyteswillbethehexadecimalequivalentoftheIPv4address
B. Ina6to4tunnel，theIPv4address192.168.99.1wouldbeconvertedtothe2002：1315：4463：1：：/64IPv6address
C. Ina6to4tunnel，theIPv4address192.168.99.1wouldbeconvertedtothe2002：c0a8：6301：：/48IPv6address
D. Ina6to4tunnel，thefirsttwobytesoftheIPv6addresswillbelocallyderivedandthenexttwobyteswillbethehexadecimalequivalentoftheIPv4address
E. Ina6to4tunnel，theIPv4address192.168.99.1wouldbeconvertedtothe2002：c0a8：6301：：/16IPv6address

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