单项选择题

LANs can be connected by using bridges,which operate in the

A．physical layer
B．data link layer
C．network layer
D．transport layer
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单项选择题
The following three concepts are essential to the OSI model:service,interface and
A．networks
B．applications
C．protocols
D．layers
单项选择题
Most frequently used algorithm for page replacement is
A．LRU
B．FIFO
C．OPT
D．PPT
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