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單項選擇題

Users are unable to access the Internet but the users are able to send/receive email from theirdesktops. Which of the following ports is MOST likely being blocked?（）

A.25
B.80
C.110
D.143

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單項選擇題

When testing a CAT5 cable, the technician notices that pin A is open. However, the cable stillworks fine. Which of the following describes how this is possible?（）

A. The cable was tested for 100Base-TX.
B. The cable is a 1000BaseT cable.
C. The switch uses link aggregation,
D. The switch was setup to use MDIX

單項選擇題

Which of the following allows a WAP to be installed in a location where there are no power outletsavailable?（）

A. Port authentication
B. PoE
C. PPTP
D. Trunking