Router# show interfaces serial 0/1 命令的输出显示了如下内容： Serial0/1 is down， line protocol is down. 线路协议为 down（关闭）的原因最可能是什么（） ["Serial0\/1 为关闭状态","路由器未连接电缆","远程路由器正在使用 serial 0\/0 接口","尚未设置时钟频率"]
辐射对称
防火墙的技术已经经历了下列哪几个阶段？（） ["包过滤技术","代理技术","硬件技术","状态监视技术"]
教师在课堂上要让学生学会自己拿着钥匙去开门。此即（）
Which three characteristics apply to IS - IS but not to OSPF?（） [" uses a default IOS metric of 10 on each interface"," uses an on - demand circuit to reduce the hello and LSA flooding across switched WAN li nks,such as ISDN"," uses a DIS and a backup DIS to present the psuedo - node on the LAN"," encapsulates PDUs directly into a data - link frame"," uses stubby areas to improve network scalability"," runs PRC (Partial Route Calculations) to calculate IP re achability informatio"]
报纸广告
