單項選擇題

Which of the following layers of the OSI model is the presentation layer?（）

A.Layer 1
B.Layer 5
C.Layer 6
D.Layer 7

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單項選擇題

Which of the following WAN protocols is a packet switching technology?（）

A.Frame Relay
B.POTS
C.PSTN
D.ISDN

單項選擇題

Using network monitoring tools would allow an administrator to do which of the following?（）

A. Configure offline devices
B. Examine performance issues
C. Install additional software and updates
D. View syslog events

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