单项选择题
Which of the following would MOST likely be used to punch down LAN cables before connecting them to the main switch?（）
A. IDF
B. 66 block
C. MDF
D. 110 block
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A.Session
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Which of the following ports does POP3 services use, by default?（）
A.25
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A user took a laptop on vacation and made changes to the configuration in order to use the device at the hotel. The user can reach the Internet, but cannot access any internal network resources. Which of the following is the MOST likely reason?（）
A. Incorrect DNS
B. Incorrect subnet mask
C. Duplicate IP address
D. Incorrect SSID
