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（）

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• What can be done to secure the virtual terminal interfaces on a router？（）

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• Router R1 has two LAN interfaces and three serial interfaces enabled for IPv6. All the inte rfaces use link local addresses automatically generated by the router. Which of the following could be the link local address of R1's interface S0/0?（）

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• What is the reason for configuring a passive interface on a router?（）

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• The following was issues on router TestKingA: TestKingA #show ip ospf neighbor Neigbor ID PRI State Dead Time Address Interface 192.168.1.2 1 Full/- 00:00:37 192.168.1.2 Serial1 Which type of OSPF network will provide the output shown in the graphic?（）

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• Under which circumstance will a branch ISR router contain interface vlan configurations?（）

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• 路由器命令Router>show interface的作用是（）？

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• Router R1 use s MAC address 1111.1111.1111 for its Fa0/0 interface. An engineer sees the following configuration in the output of a show running - config command. Then, the engineer issues a show ipv6 interface brief command. What global unicast IPv6 address does this c ommand display for interface tunnel 1？（）interface loopback 1ip address 192.168.1.1 255.255.255.255interface tunnel 1tunnel source loopback 1tunnel destination 192.168.1.2tunnel mode ipv6ip isatapipv6 address 2000::/64 eui - 64

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• There is a connectivity problem between the serial 0/0 interface of router TESTKING1 and the serial 0/0 interface of TESTKING2. A leased line point to point circuit is installed between these two routers. The output from the "show interface serial 0/0" command is displayed below for each of these routers:From your observations of the above exhibit, what is the underlying cause of the problem？（）

  <img src='https://img2.soutiyun.com/ask/uploadfile/2019-03-27/b17dddd730e091bfb3b0a6de92ff9e06.jpg' /> <img src='https://img2.soutiyun.com/ask/uploadfile/2019-03-27/699d5fe003abc58d748867d706612879.jpg' /> A. The loopback is not set. B. The serial cable is faulty. C. The subnet mask is not configured properly. D. The IP address is not configured properly. E. The Layer 2 frame types are not compatible. F. The keepalive setting is not configured properly.

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  A. FDDI B. nonbroadcast multiaccess C. broadcast multi-access D. point-to-point

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• After logging into the RtrB router, you issue the &quot;show interface&quot; command as displayed below:After considering the effects of the command output illustrated in the exhibit above,which of the following protocols are operational on the serial link？（）

  <img src='https://img2.soutiyun.com/shangxueba/ask/64344001-64347000/64344548/ae7f51c1816ba37bd63c782cfb11d742.jpg' /> A. PPP B. IP C. Compression D. IPX E. Multilink F. ATX

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• 哪两条信息会显示在 show ip interface brief 命令的输出结果中？（)

  A．IP 地址 B．MAC 地址 C．第 1 层状态 D．下一跳地址 E．接口描述 F．速度和双工设置

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