单项选择题
A. Baseline configuration
B. Logical network diagram
C. Network policy
D. Wiring schematic
单项选择题 Which of the following applications is MOST likely to require QoS to ensure proper functionality?（）
单项选择题 A technician is troubleshooting a network connectivity issue. Given the following abbreviated trace route output: Which of the following is MOST likely occurring?（）
单项选择题 At which of the following layers does the TCP protocol operate?（）