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單項選擇題

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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單項選擇題

On which of the following network devices would an administrator configure an ACL?（）

A.Router
B.Hub
C.Repeater
D.NIC

單項選擇題

Which of the following ports is the default telnet port?（）

A.20
B.21
C.22
D.23

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