单项选择题

Which of the following has the HIGHEST data rate speed?（）

A.T1
B.ADSL
C.SDSL
D.OC-3

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单项选择题

A. Loopback cable
B. Crossover cable
C. Rollover cable
D. Straight cable

单项选择题

A. Write more packet filters.
B. Write less packet filters.
C. Purchase a license for states.
D. Upgrade definitions manually

单项选择题

A.32
B.64
C.128
D.256