题目详情

某公司建立局域网拓扑图如图4-1所示。公司计划使用路由器作为DHCP服务器,根据需求,公司内部使用C类地址段,服务器地址段为192.168.2.0/24,S2和S3分别为公司两个部门的接入交换机,分别配置VLAN 10和VLAN 20,地址段分别使用192.168.10.0/24和192.168.20.0/24,通过DHCP服务器自动为两个部门分配IP地址,地址租约期为12小时。其中,192.168.10.1~192.168.10.10作为保留地址。

中级网络工程师,历年真题,2016年下半年(下午)《网络工程师》案例分析真题

图4-1

【问题1】(10分,每空1分)

下面是R1的配置代码,请将下面配置代码补充完整。

R1#config t

R1(config)#interface FastEthernet0/0

R1(config-if)#ip address(1)(2)

R1(config-if)#no shutdown

R1(config-if)#exit

R1(config)#ip dhcp(3)depart1

R1(dhcp-config)#network 192.168.10.0 255.255.255.0

R1(dhcp-config)#default-router 192.168.10.254 255.255.255.0

R1(dhcp-config)#dns-server(4)

R1(dhcp-config)#lease 0(5)0

R1(dhcp-config)#exit

R1(config)#ip dhcp pool depart2

R1(dhcp-config)#network(6)(7)

R1(dhcp-config)#default-router 192.168.20.254 255.255.255.0

R1(dhcp-config)#dns-server 192.168.2.253

R1(dhcp-config)#lease 0 12 0

R1(dhcp-config)#exit

R1(config)#ip dhcp excluded-address(8)(9)

R1(config)#ip dhcp excluded-address(10)//排除掉不能分配的IP地址

R1(config)#ip dhcp excluded-address 192.168.20.254

......

【问题2】(5分,每空1分)

下面是S1的配置代码,请将下面配置代码或解释补充完整。

S1#config terminal

S1(config)#interface vlan 5

S1(config-if)#ip address 192.168.2.254 255.255.255.0

S1(config)#interface vlan 10

S1(config-if)#ip helper-address(11)∥指定DHCP服务器的地址

S1(config-if)#exit

S1(config)#interface vlan 20

......

S1(config)#interface f0/24

S1(config-if)#switchport mode(12)

S1(config-if)#switchport trunk(13)vlan all∥允许所有VLAN数据通过

S1(config-if)#exit

S1(config)#interface f0/21

S1(config-if)#switchport mode access

S1(config-if)#switchport access vlan 5

S1(config-if)#exit

S1(config)#interface f0/22

S1(config-if)#switchport mode access

S1(config-if)#switchport access(14)

S1(config)#interface f0/23

S1(config-if)#switchport mode access

S1(config-if)#switchport access(15)

正确答案及解析

正确答案
解析

【问题1】(每空1分,共10分)

(1)192.168.1.2

(2)255.255.255.0

(3)pool

(4)192.168.2.253

(5)12

(6)192.168.20.0

(7)255.255.255.0

(8)192.168.10.1

(9)192.168.10.10

(10)192.168.10.254

【问题2】(每空1分,共5分)

(11)192.168.1.2

(12)trunk

(13)allowed

(14)vlan 10

(15)vlan 20

【问题1】(10分,每空1分)

下面是R1的配置代码,请将下面配置代码补充完整。

R1#config t

R1(config)#interface FastEthernet0/0

R1(config-if)#ip address 192.168.1.2 255.255.255.0//配置接口IP地址和掩码

R1(config-if)#no shutdown//激活接口

R1(config-if)#exit

R1(config)#ip dhcp pool depart1//配置DHCP地址池名字

R1(dhcp-config)#network 192.168.10.0 255.255.255.0

R1(dhcp-config)#default-router 192.168.10.254 255.255.255.0

R1(dhcp-config)#dns-server 192.168.2.253//DNS地址

R1(dhcp-config)#lease 0 12 0//租约时间12小时

R1(dhcp-config)#exit

R1(config)#ip dhcp pool depart2

R1(dhcp-config)#network 192.168.20.0 255.255.255.0//作用域范围

R1(dhcp-config)#default-router 192.168.20.254 255.255255.0

R1(dhcp-config)#dns-server 192.168.2.253

R1(dhcp-conlig)#lease 0 12 0

R1(dhcp-coniig)#exit

R1(config)#ip dhcp excluded-address 192.168.10.1 192.168.10.10

R1(config)#ip dhcp excluded-address 192.168.10.254//排除掉不能分配的IP地址

【问题2】(每空1分,共5分)

下面是S1的配置代码,请将下面配置代码或解释补充完整。

S1#config terminal

S1(config)#interface vlan 5

S1(config-if)#ip address 192.1682.254 255.255255.0

S1(config)#interface vlan 10

S1(config-if)#ip helper-address 192.168.1.2∥指定DHCP服务器的地址

S1(config-if)#exit

S1(config)#interface vlan 20

...

S1(config)#interface f0/24

S1(config-if)#switchport mode trunk

S1(config-if)#switchport trunk allowed vlan all//允许所有VLAN数据通过

S1(config-if)#exit

S1(config)#interface f0/21

S1(config-if)#switchport mode access

S1(config-if)#switchport access vlan 5

S1(config-if)#exit

S1(config)#interface f0/22

S1(config-if)#switchport mode access

S1(config-if)#switchport access vlan 10

S1(config)#interface f0/23

S1(config-if)#switchport mode access

S1(config-if)#switchport access vlan 20

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