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
单项选择题 Which of the following is typically used In an LAN environment?（）
单项选择题 Which of the following tools are BEST used to cut away the outside covering of a CAT5e cable?（）
单项选择题 Which of the following is true about an IP address if the first bit is a zero?（）
