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單項選擇題

Which of the following network devices uses NAT to convert private IP addresses into public IPaddresses?（）

A.NAS
B.Firewall
C.Hub
D.Bridge

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單項選擇題

Which of the following ports is used for HTTPS traffic by default?（）

A.80
B.143
C.443
D.8080

單項選擇題

Which of the following ports is used by default for IMAP traffic?（）

A.53
B.110
C.143
D.443

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