CCNA 里的一道题Refer to the exhibit. A network administrator is adding two new hosts to SwitchA. Which three valuescould be used for the configuration of these hosts? (Choose three.)A. host A IP address: 192.168.1.79B. host A IP address: 192.168

Question

CCNA 里的一道题
Refer to the exhibit. A network administrator is adding two new hosts to SwitchA. Which three values
could be used for the configuration of these hosts? (Choose three.)
A. host A IP address: 192.168.1.79
B. host A IP address: 192.168.1.64
C. host A default gateway: 192.168.1.78
D. host B IP address: 192.168.1.128
E. host B default gateway: 192.168.1.129
F. host B IP address: 192.168.1.190
Answer: ACF
为什么是这个答案? E和D为什么错误?

关键是E没有说清楚

host B default gateway: 192.168.1.129 在 VLAN 20：192.168.1.128/26~192.168.1.191/26里面.也是

个可用地址,和图中B的网关是192.168.1.130 没有关系吧 

为什么E就是错误的?

Answer 1

首先根据图判断范围：
VLAN 1：192.168.1.8/29~192.168.1.15/29
VLAN 10：192.168.1.64/27~192.168.1.95/27
VLAN 20：192.168.1.128/26~192.168.1.191/26
然后看图得出A接在6口属于属于VLAN10,B接在9属于VLAN20
那么A的IP必须在192.168.1.64/27~192.168.1.95之内,B在VLAN 20：192.168.1.128/26~192.168.1.191/26之内
D刚好等于VLAN20的网络位上,所以错,明显根据图中B的网关是192.168.1.130,所以E根本不对.
再来看ABCF：
A说主机A的地址是192.168.1.79,在VLAN10的IP范围内,正确
B说主机A的地址是192.168.1.64,是VLAN10的网络号,不对
C说主机A的网关是192.168.1.78与图中ROUTER配置IP一样,正确
F说主机B的IP是192.168.1.190,在VLAN20的IP范围内,正确
建议把书好好看看,做题的时候看清楚,E明显是个简单的错误,D看不出明显是子网划分没学好.这个是必须会的.
图看清楚了吗?不知道你是看不明白E说的是什么还是怎么的,VLAN 20的网关在图上已经很清楚了,要指定网关也是192.168.1.130,而不是192.168.1.129,你在选E有必要吗?