单项选择题

It can merely extend transport media's length so that compensate for the attenuation of signals．It is

A．repeater
B．bridge
C．router
D．gateway
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单项选择题
Which OSI layer does a bridge operate at
A．the Physical Layer
B．the Network Layer
C．the Transport Layer
D．the Data Link Layer
单项选择题
You are performing two sums: the first is a sum of two scalar variables and the second is a matrix sum of a pair of two- dimensional arrays-size 1000 by 1000. What speedup is achieved when the calculations are performed on size 1000 processors
A．50
B．100
C．999
D．none of the above
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