Which CLI command is used to display the IP address assigned to Dynamic Subscriber Interface and related hardware address using the DHCP Relay Proxy function?()A. show ip dhcp externalB. show dhcp binding relay-proxyC. show ip dhcp binding relay-proxyD. s

题目
Which CLI command is used to display the IP address assigned to Dynamic Subscriber Interface and related hardware address using the DHCP Relay Proxy function?()

A. show ip dhcp external

B. show dhcp binding relay-proxy

C. show ip dhcp binding relay-proxy

D. show dhcp relay proxy binding


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  • 第1题:

    In which two ways can the router ID selection be controlled?()

    A. Manually assign rid.

    B. configure local-address.

    C. enable the fxp0 interface.

    D. Assign nonmartian address to lo0.


    参考答案:A, D

  • 第2题:

    Whichofthefollowingcommandsprovidesdataplaneinformationrequiredtoforwardapackettoaspecificipaddress?()

    A.shiproute

    B.shipcef〈ip_address〉

    C.shadjacency〈ip_address〉

    D.shiproute〈ip_addres$〉

    E.shipadjacency〈/p_address〉

    F.shipcef〈mac_addrQss〉〈ip_address〉


    参考答案:B

  • 第3题:

    在某台Cisco路由器中定义一个名为test的DHCP地址池(192.168.3.0/26),并保留192.168.3.62/29的IP地址。下列正确的配置语句是(29)。

    A.Router(config)#ip dhcp pooltest Router(dhcp-config)#network 192.168.3.00.0.0.63 Router(dhcp-config)#ip dhcp excluded-address192.168.3.62

    B.Router(config)#ip dhcp poo1 test Router(dhcp-config)#network 192.168.3.0255.255.255.192 Router(dhcp-config)#ip dhcp excluded-address 192.168.3.62255.255.255.248

    C.Router(config)#ip dhcp poo1 test Router(dhcp-config)#network 192.168.3.0/26 Router(dhcp-config)#ip dhcp excluded-address 192.168.3.62/29

    D.Router(config)#ip dhcp excluded-address 192.168.3.56192.168.3.62 Router(config)#ip dhcp pool test Router(dhcp-config)#network 192.168.3.0/26


    正确答案:D
    解析:子网地址是DHCP服务器可以分配给DHCP客户的有效IP地址范围。在DHCP Pool配置模式下,使用命令“networknetwork-number>[mask|/prefix-length]”配置IP地址池的子网地址和子网掩码。其中,子网掩码参数允许以两种形式表达,一种形式常见的点分十进制数表达形式(如 255.255.255.192),另一种形式是给出掩码前缀的长度,即掩码位为“1”的个数,如“255.255.255.192”可以写成“/26”。本试题中,配置DHCP地址池192.168.3.0/26的语句如下:
      Router(dhcp-config)#network192.168.3.0255.255.255.192
      或Router(dhcp-contig)#network192.168.3.0/26
      可以在全局配置模式“Router(config)#”下,使用“ip dhcp excluded-address low-address[high-address]”命令将要保留的地址从IP地址池中排除,使之成为不能动态分配的地址。本试题中,需要排除的IP地址范围是192.168.3.62/29。其中,“/29”是子网掩码255.255.255.248的前缀的长度。由于IP地址192.168.3.62的二进制表示是“1100 0000 1010 1000 0000 0011 1110”,其中阴影部分是子网掩码覆盖的比特范围,因此192.168.3.62/29所表达的IP地址范围是192.168.3.56-192.168.3.63。再由于192.168.3.63是 192.168.3.0/26网段的直接广播地址,需要排除,因此保留IP地址范围192.168.3.62/29的配置语句如下:
      Router(config)#ip dhcp excluded-adclress 192.168.3.56 192.168.3.62
      本试题选项A的“ip dhcp excluded-address192.168.3.62”仅排除单个IP地址192.168.3.62。选项B和选项C保留IP地址配置命令所在的配置模式有误,且不允许出现选项B的“ip dhcp exclude_address192.168.3.62 255.255.255.248”和选项C的“ip dhcp excluded-address 192.168.3.62/29”等带有子网掩码的格式。

  • 第4题:

    Which configuration command controls the source IP address for packets sent to a RADIUS server?()

    A.radius override nas-ip-addr

    B.radius source-ip-address 10.13.7.55

    C.radius update-source-address 10.13.7.11

    D.radius authentication server 10.13.7.55


    参考答案:C

  • 第5题:

    配置DHCP服务器IP地址池的地址为193.45.98.0/24,其中193.45.98.10~193.45.98.30用做静态地址分配,正确的配置语句是______。

    A.ip dhcp excluded-address 193.45.98.10.193.45.98.30 network 193.45.98.0 255.255.255.0

    B.ip dhcp excluded-address 193.45.98.10.193.45.98.30 network 193.45.98.0/24

    C.ip dhcp excluded-address 193.45.98.10 193.45.98.30 network 193.45.98.0 0.0.0.255

    D.ip dhcp excluded-address 193.45.98.10 193.45.98.30 network 193.45.98.0 255.255.255.0


    正确答案:D
    解析:本试题中,地址块“193.45.98.0/24”的“/24”是子网掩码255.255.255.0的简化表达形式。在DHCP Pool配置模式下,使用命令networknetwork-number>[mask|/prefix-length]配置分配给DHCP客户的有效IP地址池的子网地址和子网掩码。其中,子网掩码参数允许以点分十进制数、掩码前缀长度两种形式表达。因此,DHCP服务器IP地址池的地址为193.45.98.0/24的配置语句,如下所示:
      Router (dhcp-config)# network l93.45.98.0 255.255.255.0
      或:
      Router (dhcp-eonfig)# network 193.45.98.0/24
      在全局配置模式“Router(config)#”下,使用命令ip dhcp excluded-address low-address [high-address]将所要保留的IP地址从预定义的IP地址池中排除,使之成为不能动态分配的IP地址。若将IP地址池中 193.45.98.10~193.45.98.30用做静态地址分配,则相关的配置语句如下:
      Router (confiq)#ip dhcp excluded-address 193.45.98.10 193.45.98.30
      本试题选项A、选项B、选项C的配置语句,分别存在不符合以上两条命令的语法格式。

  • 第6题:

    配置DHCP服务器IP地址池的地址为193.45.98.0/24,其中193.45.98.10至193.45.98.30用作静态地址分配,正确的配置语句是

    A.ip dhcp excluded-address 193.45.98.10,193.45.98.30 network 193.45.98.0 255.255.255.0

    B.ip dhcp excluded-address 193.45.98.10,193.45.98.30 network 193.45.98.0 /24

    C.ip dhcp excluded-address 193.45.98.10 193.45.98.30 network 193.45.98.0 0.0.0.255

    D.ip dhcp excluded-address 193.45.98.10 193.45.98.30 network 193.45.98.0 255.255.255.0


    正确答案:D
    P187