How does the ERX Edge Router interact with an external DHCP server in a Bridged 1483 network?()A.It maintains DHCP leases on behalf of subscribers.B.It initiates DHCP requests on behalf of subscribers.C.It passes DHCP traffic to and from the server;you mu

题目
How does the ERX Edge Router interact with an external DHCP server in a Bridged 1483 network?()

A.It maintains DHCP leases on behalf of subscribers.

B.It initiates DHCP requests on behalf of subscribers.

C.It passes DHCP traffic to and from the server;you must configure static host routes.

D.It passes DHCP traffic to and from the server and inserts host routes into its routing table.


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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 an external DHCP server in a Bridged 1483 network?() ”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:

    Which two B-RAS service offerings maintain the analog dial-up model with centralized user authentication,authorization,andaccounting?()

    A.Routed1483

    B.Bridged1483

    C.PPPoverATM

    D.PPPoverEthernet


    参考答案:C, D

  • 第3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4题:

    假设要动态分配的地址段是:192.168.0.1/24—192.168.0.254/24,路由器网关地址:192.168.0.1。请填写以下Cisco路由器配置DHCP命令的描述。

    ip dhcp excluded—address 192.168.0.1 192.168.0.50 (1)

    ip dhcp pool test (2)

    network 192.168.0.0 255.255.255.0 (3)

    default—router 192.168.0.1 (4)

    dns—server***,***,***,*** (5)


    正确答案:(1)设置预留地址 (2)创建地址分配池 (3)定义网络地址段 (4)定义网关 (5)定义DNS服务器地址
    (1)设置预留地址 (2)创建地址分配池 (3)定义网络地址段 (4)定义网关 (5)定义DNS服务器地址 解析:DHCP是动态分配IP地址的一个服务,这个服务的使用可以减少网络管理中繁复的地址分配问题。也可以避免手动配置中带来的IP地址冲突问题。在预留地址的控制上也可以得到一定的方便。我们来看一下在思科路由器上是如何完成这项配置的:进入全局配置模式(cod t)
    ip dhcp exduded—address 192.168.O.1 192.168.0.
    50??设置预留地址??
    ip dhcp pool test?.-创建地址分配池??
    network 192.168.O.0 255.255.255.O??定义网
    络地址段??
    default—router 192.168.O.1??定义网关_l?
    dns—server***.***.***.*** **
    定义DNS服务器地址??
    lease 30??定义地址租约时限**
    n0 ip dhcp conflict logging**取消地址冲突记录日志**

  • 第5题:

    Which two B-RAS service offerings do not require user authentication?()

    A.Routed 1483

    B.Bridged 1483

    C.PPP over ATM

    D.PPP over Ethernet


    参考答案:A, B

  • 第6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。