单项选择题
After testing a new 100BaseTX cable, the technician determines that only pairs 4, 5, 7, and 8 are straight-thru wires.
Which of the following MOST likely describes this cable type?（）
A. Crossover cable with open pairs
B. Crossover cable
C. Rollover cable
D. Straight-thru cable with open pairs
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Which of the following is typically used In an LAN environment?（）
A.10GBase-SW
B.10GBase-LW
C.10GBase-SR
D.10GBase-EW -
单项选择题
Which of the following tools are BEST used to cut away the outside covering of a CAT5e cable?（）
A. Stripper
B. Punch down tool
C. Butt set
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Which of the following is true about an IP address if the first bit is a zero?（）
A. The address is a Class A address.
B. The address is a Class B address.
C. The address is a Class C address.
D. The address is a Class D address.
