单项选择题

When a large packet wants m travel through a network whose MTU is too small, one solution is to allow routers to break up the packet into（）.

A．messages
B．frames
C．fragments
D．bits

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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
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
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