单项选择题
Which of the following analyzes the entire subnet to identify all hosts that are active?（）
A. Ping sweep B. Packet sniffer C. Traceroute D. Port scanner
单项选择题 On which of the following network devices would an administrator configure an ACL?（）
单项选择题 Which of the following ports is the default telnet port?（）
单项选择题 Which of the following cables is the MOST susceptible to interference?（）
