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查看OSPF接口的开销、状态、类型、优先级等的命令是( )；查看OSPF在接收报文时出错记录的命令是( )（66）A． display ospfB. display ospf errorC. display ospf interfaccD. display ospf neighbor（67）A． display ospfB. display ospf errorC. display ospf interfaceD. display ospf neighbor
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The TTL field was originally designed to hold a time stamp, which was decremented by each visited router. The datagram was ( ) when the value became zero. However, for this scheme, all the machines must have synchronized clocks and must know how long it takes for a datagram to go from one machine to another. Today, this field is used mostly to control the ( ) number of hops (routers) visited by the datagram. When a source host sends the datagram, it ( ) a number in this field. Each router that processes the datagram decrements this number by 1. If this value, after being decremented, is zero, the router discards the datagram.This field is needed because routing tables in the Internet can become corrupted.A datagram may travel between two or more routers for a long time without ever getting delivered to the ( ).This field limits the ( ) of a datagram.（71）A．receivedB.discardedC.rejectedD.tansferred（72）A．maximumB.minimumC.exactD.certain（73）A．controlsB.transmitsC.storesD.receives（74）A．switchB.routerC.source hostD.destination host（75）A．lifetimeB.moving timeC.receiving timeD.transmitting time
计算机中进行数据运算的子系统是_______.
如果计算机断电,那么下列_______中的数据将被擦除。 a.RAM
_______是使用电容器类型的存储器,而且需要周期性地进行刷新。
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