When does the E－series router start monitoring DHCP traffic using the DHCP External function?() A. When the discovery packet enters the router from the DHCP client.B. Only when the offer packet enters the router from the DHCP server.C. When the acknowledge packet enters the router from the DHCP server.D. Only when the discovery packet leaves the router going to the DHCP server.
When does the E－series router start monitoring DHCP traffic using the DHCP External function?()
A. When the discovery packet enters the router from the DHCP client.
B. Only when the offer packet enters the router from the DHCP server.
C. When the acknowledge packet enters the router from the DHCP server.
D. Only when the discovery packet leaves the router going to the DHCP server.
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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
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 202.112.7.0 255.255.255.0B．Router(config)#ip dhcp excluded-address 202.112.7.2-10 Router(config)#ip dhcp pool test Router(dhcp-config)#network 202.112.7.0/24C．Router(config)#ip dhcp excluded-address 202.112.7.2-10 Router(config)#ip dhcp pool test Router(dhcp-config)#network 202.112.7.0 0.0.0.255D．Router(config)#ip dhcp excluded-address 202.112.7.2-10 Router(config)#ip dhcp pool test Router(dhcp-config)#network 202.112.7.0 255.255.255.0
【问题5】（3分，每空1分）假如在图3.1中移除DHCP服务器，改由单位Router来提供DHCP服务，在Router上配置DHCP服务时用到了如下命令，请在下划线处将命令行补充完整。Router(config)ip(5)hkhk//配置DHCP地址池名为hkhkRouter(dhcp-config)(6)192.168.1.0 255.255.255.0Router(dhcp-config)(7)192.168.1.9
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 202.112.7.0-255.255.255.0B．Router(config) #ip dhcp excluded-address 202.112.7.2-202.112.7.10 Router(config) #ip dhcp pool test Router(dhcp-config) #network 202.112.7.0/24C．Router(config) #ip dhcp excludeaddress 202.112.7.2-202.112.7.10 Router(config) #ip dhcp pool test Router(dhcp-config) #network 202.112.7.0-0.0.0.255D．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
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 30B.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 30C.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 30D.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
如下图所示，某校园网用1OGbps的POS技术与Internet相连，POS接口的帧格式是SDH。路由协议的选择方案是校园网内部采用OSPF协议，校园网与Internet的连接使用静态路由协议。校园网内的路由器R1设为DHCP服务器，可分配的IP地址是221．89．23．192／26，其中221．89．23．200-221．89．23．254地址除外，地址租用时间为5小时30分。问题：请阅读以下R3和R1的部分配置信息，并补充下列空白处的配置命令或参数，按题目要求完成路由器的配置。R3的POS接口、OSPF和缺省路由的配置信息如下：Router-R3configure terminalRouter-R3(config)interface pos4／0Router-R3(config-if)description To IntemetRouter-R3(config-if)bandwidth 10000000Router-R3(config-if)ip address 21 1．68．69．170 255．255．255．252Router-R3(config-if)【6】32Router-R3(config-if)pos framing sdhRouter-R3(config-if)no ip directed—broadcastRouter-R3(config-if)pos flag sl sO 2Router-R3(config-if)no shutdownRouter-R3(config-if)exitRouter-R3(config)router ospf 63Router-R3(config-router)network【7】area 0Router-R3(config-router)redistribute connected metric-type 1 subnetsRouter-R3(config-router)area o range 【8】Router-R3(config-router)exitRouter-R3(config)ip route 0．0．0．0 0．0．0．0 211．68．69．169Router-R3(config)exitRouter-R3R1的DHCP的部分配置信息如下：Router-Rlconfigure terminalRouter-Rl(config)ip dhcp【9】221．89．23．200 221．89．23．254Router-R1(eonfig)ip dhcp pool buptRouter-R1(dhep-config)network 221．89．23．192 255．255．255．192Router-R1(dhcp-config)default-router 221．89．23．193Router-R1(dhcp-config)domain-nanle bupt．edu．cnRouter-R1(dhcp-config)dns-server address 221．89．24．27 221．89．24．26Router-R1(dhcp-config)lease 【10】Router-R1(dhcp-config)exitRouter-R1(config)exitRouter-R1
根据网络拓扑和要求说明，完成(或解释)路由器R1 的配置：R1#configR1(config)# interface FastEthernet 0/1R1(config-if)#ip address (1) (2)R1(config-if)#no shutdownR1(config-if)#exitR1(config)#ip dhcp pool vlan 3R1(dhcp-config)#network 192.168.3.0 255.255.255.0R1(dhcp-config)#default-router 192.168.3.254 255.255.255.0 ; (3)R1(dhcp-config)#dns-server 192.168.2.1 ; (4)R1(dhcp-config)#lease 0 8 0 ; (5)R1(dhcp-config)#exitR1(config)#ip dhcp pool vlan 4R1(dhcp-config)#network (6) (7)R1(dhcp-config)#default-router 192.168.4.254 255.255.255.0R1(dhcp-config)#dns-server 192.168.2.1R1(dhcp-config)#lease 0 8 0R1(dhcp-config)#exitR1(config)#ip dhcp excluded-address (8) (9)R1(config)#ip dhcp excluded-address 192.168.3.254//排除掉不能分配的IP 地址R1(config)#ip dhcp excluded-address 192.168.4.254R1(config)# (10) 192.168.3.0 255.255.255.0 FastEthernet0/1//在以太网接口和VLAN3 间建立一条静态路由
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-address192.168.3.62B．Router(config)#ip dhcp poo1 test Router(dhcp-config)#network 192.168.3.0255.255.255.192 Router(dhcp-config)#ip dhcp excluded-address 192.168.3.62255.255.255.248C．Router(config)#ip dhcp poo1 test Router(dhcp-config)#network 192.168.3.0/26 Router(dhcp-config)#ip dhcp excluded-address 192.168.3.62/29D．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
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 bindingB．Router# show ip dhcp poolC．Router# show ip dhcp server statisticsD．Router# show running-config I section_dhcp
下列关于DHCP客户机和DHCP服务器交互过程中错误的是（)A．DHCP客户机广播“DHCP发现消息”时使用的源IP地址是127.0.0.1B．DHCP服务器收到“DHCP发现消息”后，向网络广播“DHCP提供消息”C．DHCP客户机收到“DHCP提供消息”后，向DHCP服务器发送“DHCP请求消息”D．DHCP服务器收到“DHCP请求消息”后，向网络广播“DHCP确认消息”