单项选择题
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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单项选择题
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 -
单项选择题
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 -
单项选择题
A technician needs to add network capacity. However, when plugging a second switch into the first switch, there is no link light. Which of the following is the cause of this situation?（）
A. The switches are not stackable
B. The cable was not wired using 568A
C. The cable needs to be a crossover cable
D. The switches have IGMP snooping enabled
