皮皮学，免费搜题
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【简答题】
The boy ____________ is playing ping-pong is my classmate. 2. The e-mail ___________ I received yesterday was from my sister. 3. I hate people ______________ talk much but do little. 4. The car _____________ my father bought last month is very beautiful. 5.The man ______ hair is white is his grandfather. 6. Is there a student _________ father is a business man? 7. This is the house in ________ we have lived for 10 years. 8. I ’ ve never heard of the people and things ________ you talked about just now.
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皮皮学刷刷变学霸
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【单选题】下列选项中，关于局域网交换机技术特征的描述不正确的是( )。
A.
局域网交换机工作在数据链路层和网络层，是一种典型的网络互联设备
B.
局域网交换机建立和维护一个表示MAC地址与交换机端口对应关系的交换表
C.
局域网交换机根据进入端口数据帧中的MAC地址，过滤和转发数据帧
D.
局域网交换机在发送结点所在的交换机端口(源结点)和接收结点所在的交换机端口(目的端口)之间建立虚连接