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
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On which of the following network devices would an administrator configure an ACL?（）
A.Router
B.Hub
C.Repeater
D.NIC -
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Which of the following ports is the default telnet port?（）
A.20
B.21
C.22
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Which of the following cables is the MOST susceptible to interference?（）
A.Fiber
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