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计算机
Refer to the exhibit. All of the routers in the network are configured with the ip subnet-zero command. Which network addresses
Refer to the exhibit. All of the routers in the network are configured with the ip subnet-zero command. Which network addresses
admin
2019-04-08
74
问题
Refer to the exhibit. All of the routers in the network are configured with the ip subnet-zero command. Which network addresses should be used for Link A and Network A?
选项
A、Network A - 172.16.3.48/26
B、Network A - 172.16.3.128/25
C、Network A - 172.16.3.192/26
D、Link A - 172.16.3.0/30
E、Link A - 172.16.3.40/30
答案
B,D
解析
这是个IP地址规划的考题。Network A中有120台主机,因此Network A中至少需要122个IP地址,根据公式2n >=122,可以解出n=7,因此网络位为32-7=25,容纳的IP地址为128。因此 Network A的网段就可以为172.16.3.0/25或172.16.3.128/25。通过其他的设备分配的地址可以看到172.16.3.0/25的地址已经有一部分分配出去了,因此Network A分配的地址空间只能是172.16.3.128/25.Link A只需要有两个可用的IP地址,因此网段中需要有4个地址根据公式2n >=4,可以解出n=2,因此网络位为32-2=30。而从其他路由器上的地址分配我们可以看到地址172.16.3.4-172.16.3.15, 172.16.3.32-172.16.3.127 这些IP地址都已经分配出去了,因此结合答案我们可以看到Link A的地址空间只能为172.16.3.0/30。
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