How does the ERX Edge Router interact with subscriber IP addresses assigned by an external DHCP server?()A.It monitors messages from the external server and updates the routing table as needed.B.It maintains the leases for the DHCP server and reassigns ad

题目
How does the ERX Edge Router interact with subscriber IP addresses assigned by an external DHCP server?()

A.It monitors messages from the external server and updates the routing table as needed.

B.It maintains the leases for the DHCP server and reassigns addresses to new subscribers.

C.It sends keep alives to the subscriber and makes the address available when the subscriber stops responding.

D.It sends keep alives to the subscriber and removes the host route when the subscriber stops responding.


相似考题

1.在Cisco路由器上建立一个名为zw246的DHCP地址池,地址池的IP地址是176.115.246.0/24,其中不用于动态分配的地址有176.115.246.2~176.115.246.10,缺省网关为176.115.246.1,域名为tj.edu.cn,域名服务器地址为176.115.129.26,地址租用时间设定为6小时30分钟。下列DHCP地址池的配置,正确的是A)Router (config)#ip dhcp pool zw246Router (dhcp-config)#ip dhcp excluded-address 176.115.246.2 176.115.246.10Router (dhcp-config)#network 176.115.246.0 255.255.255.0Router (dhcp-config)#default-router 176.115.246.1Router (dhcp-config)#domain-name tj.edu.cnRouter (dhcp-config)#dns-server address 176.115.129.26Router (dhcp-config)#lease 0 6 30B)Router (config)#ip dhcp excluded-address 176.115.246.2-10Router (config)#ip dhcp pool zw246Router (dhcp-config)#network 176.115.246.0 255.255.255.0Router (dhcp-config)#default-router 176.115.246.1Router (dhcp-config)#domain-name tj.edu.cnRouter (dhcp-config)#dns-server address 176.115.129.26Router (dhcp-config)#lease 0 6 30C)Router (config)#ip dhcp excluded-address 176.115.246.2 176.115.246.10Router (config)#ip dhcp pool zw246Router (dhcp-config)#network 176.115.246.0 255.255.255.0Router (dhcp-config)#default-router 176.115.246.1Router (dhcp-config)#domain-name tj.edu.cnRouter (dhcp-config)#dns-server address 176.115.129.26Router (dhcp-config)#lease 0 6 30D)Router (config)#ip dhcp excluded-address 176.115.246.2 176.115.246.10Router (config)#ip dhcp pool zw246Router (dhcp-config)#network 176.115.246.0 255.255.255.0Router (dhcp-config)#default-router 176.115.246.1Router (dhcp-config)#domain-name tj.edu.cnRouter (dhcp-config)#dns-server address 176.115.129.26Router (dhcp-config)#lease 30 6 0

更多“How does the ERX Edge Router interact with subscriber IP addresses assigned by an external DHCP server?() ”相关问题
  • 第1题:

    在路由器上建立一个名为test的DHCP地址池,并为其分配IP地址202.112.7.0/24,子网地址中的202.112.7.2~202.112.7.10作为静态地址分配,正确的DHCP配置是______。

    A.Router(config) #ip dhcp pool test Router(config) #ip dhcp excluded-address 202.112.7.2-10 Router(dhcp-config) #network 202.112.7.0-255.255.255.0

    B.Router(config) #ip dhcp excluded-address 202.112.7.2-202.112.7.10 Router(config) #ip dhcp pool test Router(dhcp-config) #network 202.112.7.0/24

    C.Router(config) #ip dhcp exclude&address 202.112.7.2-202.112.7.10 Router(config) #ip dhcp pool test Router(dhcp-config) #network 202.112.7.0-0.0.0.255

    D.Router(config) #ip dhcp excluded-address 202.112.7.2-202.112.7.10 Router(config) #ip dhcp pool test Router(dhcp-config) #network 202.112.7.0-255.255.255.0


    正确答案:D
    解析:静态地址分配Router(config) #ip dhcp excluded-address 202.112.7.2 202.112.7.10
      配置IP地址池的域名Router(config) #ip dhcp pool test
      为test的DHCP地址池分配IP地址Router(dhcp-config) #network202.112.7.0 255.255.255.0

  • 第2题:

    Refertotheexhibit.WhichofthefollowingIOSDHCPconfigurationstatementsisrequiredsothataCiscoskinny-basedIPphonecanconnectwithCallManager?()

    A.ipdhcppoolClient

    B.network10.1.1.0255.255.255.240

    C.default-router10.1.1.1

    D.dns-server10.2.2.2

    E.domain-namecisco.com

    F.option150ip10.3.3.3


    参考答案:F

  • 第3题:

    阅读以下说明,回答问题1至问题4,将解答填入答题纸对应的解答栏内。

    【说明】
    如图3-1所示,某公司规划了两个网段,网段10.1.1.0/24为固定办公终端,网段10.1.2.0/24提供访客临时接入网络。PC-1使用固定IP地址:10.1.1.100/24,其他终端使用DHCP方式分配IP地址。

    【问题1】(4分)

    所有设备配置保持默认配置情况下,图3-1拓扑中,有(1)个冲突域,有(2)个广播域(按照50个PC终端计算)。

    【问题2】(8分)

    按照公司网络设计要求,需对Switch完成基本配置,请将下面的配置代码补充完整。

    (3)

    [HUAWEI] sysname(4)

    [DHCP-Server] dhcp enable

    [DHCP-Server] vlan (5)10 to 11 //创建VLAN10和VLAN11

    [DHCP-Server](6) gigabitethernet 0/0/1

    [DHCP-Server-GigabitEthernet0/0/1]port link-type (7)

    [DHCP-Server-GigabitEthernet0/0/1]port default vlan (8)

    [DHCP-Server-GigabitEthernet0/0/1]quit

    [DHCP-Server]interface vlanif 10

    [DHCP-Server-Vlanif10] ip address (9) (10)

    [DHCP-Server-Vlanif10]quit

    [DHCP-Server]

    gigabitethernet 0/0/2 接口配置略

    ......

    (3)~(10)备选答案

    A.24 B.DHCP-Server C.10.1.1.1 D.system-view

    E.interface F.batch G.access H.10

    【问题3】(6分)

    按照公司网络设计要求,完成DHCP服务器配置,固定办公设备IP地址租期为30天,访客的IP地址租期为1天,请将下面的配置代码补充完整。

    ......

    [DHCP-Server]interface vlanif 10

    [DHCP-Server-Vlanif10] (11) select interface //使能接口采用接口地址池的DHCP服务器功能

    [DHCP-Server-Vlanif10]dhcp server lease day (12)

    [DHCP-Server-Vlanif10]dhcp server static-bind ip-address (13) mac-address (14) //为PC-1分配固定的IP地址

    [DHCP-Server-Vlanif10]quit

    [DHCP-Server]interface vlanif 11

    [DHCP-Server-Vlanif11]dhcp select interface

    [DHCP-Server-Vlanif11]quit

    [DHCP-Server]

    (11)~(14)备选答案

    A.10.1.1.100 B.286e-d444-b692 C.dhcp D.30

    【问题4】(2分)

    在问题3的配置代码中,没有关于VLAN11地址租期的配置代码,下面的描述中正确的是(15)。

    (15)备选答案

    A.配置错误,须手动添加相关配置代码,否则VLAN11的客户端无法获取IP地址

    B.配置错误,须手动添加相关配置代码,否则DHCP服务器无法正常工作

    C.配置正确,无需手动添加配置代码,VLAN11的地址租期将与VLAN10相同


    D.配置正确,无需手动添加配置代码,默认地址租期为1天


    答案:
    解析:
    试题分析:交换机是二层设备,每一个端口在一个冲突域,所有端口在同一个广播域,因此交换机不能隔离广播域,但是却可以隔离冲突域。因此可知冲突域数量为50个+核心交换机与下级交换机连接的2个=52个,广播域则要看所划分的Vlan个数,因为一个VLAN就是一个广播域),本题中为2个。System-view 进入到系统视图Sysname DHCP-Server 给设备命名为DHCP-ServerVLAN batch 10 to 11 批量创建VLAN 10-11Interface gigabitethernet 0/0/1 进入接口g0/0/1视图Port link-type access 配置接口类型为access类型Port default vlan 10 设置接口默认Vlan为VLAN 10Ip address 10.1.1.1 24 配置接口IP地址 DHCP select interface 使能接口采用DHCP服务的接口模式Dhcp server lease day 30 设置ip地址租约为30天Dhcp server static-bind ip-address 10.1.1.100 mac-address 286e-d444-b692 为PC-1分配固定 的IP地址。DHCP服务租约信息是可选配置,可手动配置租约期限,同时也可以采用默认租约1天。
    参考答案:【问题一】(4分)1、522、2【问题二】(8分)3、D System-view4、B DHCP-Server5、F Batch6、E Interface7、G8、H9、C10、A【问题三】(6分)11、C12、D13、A14、B【问题四】(2分)15、D

  • 第4题:

    在Cisc0路由器上建立-个名为zw246的DHCP地址池,地址池的IP地址是176.115.246.0/24,其中不用于动态分配的地址有176.115.246.2-176.115.246.10,缺省网关为l76.115.246.1,域名为tj.edu.en,域名服务器地址为l76.115.129.26,地址租用时间设定为6小时30分钟。下列DHCP地址池的配置,正确的是( )。

    A.Router(config)#ip dhcp pool zw246Router(dhcp-eonfig)#ip dhep excluded-address l76.1 15.246.2 176.1 15.246.10Router(dhcp-eonfig)#network l76.115.246.0 255.255.255.0Router(dhcp-config)#default-router l76.115.246.1Router(dhcp-config)#domain-name tj.edu.enRouter(dhcp-config)#dns-server address 176.1 15.129.26Router(dhcp-config)#lease 0 6 30

    B.Router(config)#ip dhcp excluded-address 176.115.246.2-10Router(config)#ip dhcp pool zw246Router(dhcp-config)#network l76.1 15.246.0 255.255.255.0Router(dhcp-config)#default-router l76.115.246.1Router(dhcp-config)#domain-name tj.edu.caRouter(dhcp-config)#dns-server address l76.115.129.26Router(dhcp-config)#lease 0 6 30

    C.Router(config)#ip dhcp excluded-address l76.115.246.2 176.115.246.10Router(config)#ip dhcp pool zw246Router(dhcp-config)#network 176.115.246.0 255.255.255.0Router(dhcp-config)#default-muter l76.115.246.1Router(dhcp-config)#domain -name tj.edu.anRouter(dhcp-config)#dns-server address 176.115.129.26Router(dhcp-config)#lease 0 6 30

    D.Router(config)#ip dhcp excluded-address 176.1 15.246.2 176.1 15.246.10Router(config)#ip dhcp pool zw246Router(dhcp-config)#network 176.1 15.246.0 255.255.255.0Router(dhcp-config)#default-router 176.1 15.246.1Router(dhcp-config)#domain-name tj.edu.cnRouter(dhcp-config)#dns-server address 176.115.129.26Router(dhcp-config)#lease 30 6 0


    正确答案:C
    Cisco路由器DHCP地址池的配置:步骤一:首先排除不用于动态分配的地址(config)#ipdhcpexcluded-address176.115.246.2176.115.246.10步骤二:配置一个名为zw246的DHCP地址池(config)#ipdhcppoolzw246步骤三:配置IP地址池的子网地址和子网掩码(dhcpoconfig)#network176.115.246.0255.255.255.0步骤四:配置缺省网关(dhepocontig)#defaultorouterl76.115.246.1步骤五:配置IP地址池的域名(dhcpoconfig)#do-mainoNametj.edu.cn步骤六:配置域名服务器的IP地址(dhcpoconofig)#dnsoserveraddress176.115.129.26步骤七:配置租借期为6小时30分钟(dhcp-con.fig)#lease0630,格式为:lease天数小时数分钟数因此C选项正确。

  • 第5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6题:

    下列哪条命令可让网络管理员检查分配给特定 MAC 地址的 IP 地址?

    A.Router# show ip dhcp binding

    B.Router# show ip dhcp pool

    C.Router# show ip dhcp server statistics

    D.Router# show running-config I section_dhcp


    Router# show ip dhcp binding