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计算机
Refer to the exhibit. The network administrator has created a new VLAN on Switch1 and added host C and host D. The administrator
Refer to the exhibit. The network administrator has created a new VLAN on Switch1 and added host C and host D. The administrator
admin
2019-04-08
4
问题
Refer to the exhibit. The network administrator has created a new VLAN on Switch1 and added host C and host D. The administrator has properly configured switch interfaces FastEthernet0/13 through FastEthernet0/24 to be members of the new VLAN. However, after the network administrator completed the configuration, host A could communicate with host B, but host A could not communicate with host C or host D. Which commands are required to resolve this problem?
选项
A、Router(config)# interface fastethernet 0/1.3
Router(config-if)# encapsulation dot1q 3
Router(config-if)# ip address 192.168.3.1 255.255.255.0
B、Router(config)# router rip
Router(config-router)# network 192.168.1.0
Router(config-router)# network 192.168.2.0
Router(config-router)# network 192.168.3.0
C、Switch1# vlan database
Switch1(vlan)# vtp v2-mode
Switch1(vlan)# vtp domain cisco
Switch1(vlan)# vtp server
D、Switch1(config)# interface fastethernet 0/1
Switch1(config-if)# switchport mode trunk
Switch1(config-if)# switchport trunk encapsulation isl
答案
A
解析
这是一个多VLAN间通讯的问题,虽然都同在一台交换机上,但是由于处在不同的VLAN中,而导致了不同VLAN中的主机是不能通讯的。这时我们就需要借助与trunk和三层的路由功能了,在交换机和路由器之间封装TRUNK,这样可以允许交换机间的二层的通讯,但是由于两个VLAN是划分到不同的网段中的,因此需要借助路由器的路由功能来实现三层的可达,可以将VLAN中的主机的网关指定为路由器与该VLAN相连的子接口的地址,这样VLAN中的数据包就都会发往网关,而由网关来进行进一步的转发。在这个题中,题目给出了路由器的的子接口的网段,而又给出了VLAN 2与路由器相连的接口的IP地址,所以剩下的一个网段就是给VLAN 3的了 ,所以要在路由器上将与一个子接口划分到VLAN 3,并给其分配另一个网段中的IP地址。这样就可以了
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