单项选择题
A. Install a small network switch
B. Use port mirroring on the switch
C. Split the pairs of the existing jack
D. Install a CSU/DSU
单项选择题 A network at a small business utilizes a star topology and is experiencing frequent collisionsamong data packets. Which of the following devices is MOST likely being used?（）
单项选择题 Which of the following is the full range of address block 192.16876.0/23?（）
单项选择题 Which of the following improves wireless performance by allowing only one wireless transmissionon the network at a time?（）