单项选择题

The operation of the Internet is closely monitored by the routers. When something unexpected occurs, the event will be reported by the protocol（）.

A．IGMP
B．ICMP
C．IP
D．OSPF

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单项选择题
The information can be written into both the block in the Cache and the block in the memory. This kind of technique used in the Cache is called（）

A．write through
B．copy back
C．write buffer
D．copy through
单项选择题
The data hazard in pipeline does not include（）.

A．RAW
B．WAW
C．WAR
D．RAR
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