问题
选择题
Jenny is ______ girl. [ ]
A. an eighteen-years-old
B. an 18-year-old
C. a 18-year-old
D. 18-years-old
答案
答案：B
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Jenny is ______ girl. [ ]
A. an eighteen-years-old
B. an 18-year-old
C. a 18-year-old
D. 18-years-old
答案：B
[说明]
某一网络地址块192.168.75.0中有5台主机A、B、C、D和E，它们的IP地址及子网掩码如表4—1所示。
| 表4-1 主机IP地址及子网掩码表 | ||
| 主 机 | IP地址 | 子网掩码 |
| A | 192.168.75.18 | 255.255.255.240 |
| B | 192.168.75.146 | 255.255.255.240 |
| C | 192.168.75.158 | 255.255.255.240 |
| D | 192.168.75.161 | 255.255.255.240 |
| E | 192.168.75.173 | 255.255.255.240 |
若在该网络地址块中采用VLAN技术划分子网，何种设备能实现VLAN之间的数据转发