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單項選擇題

A network administrator needs to add an additional connection to a room. The administrator adds a new Ethernet switch and must connect it to an existing switch.
Which cable type should be used to connect the two switches?（）

A. CAT3 cable
B. Serial cable
C. Crossover cable
D. Rollover cable

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單項選擇題

A user connecting a laptop to a wall jack is prompted for user credentials before being grantedaccess to the network. Which of the following is MOST likely implemented on the switch?（）

A. MAC filtering
B. PoE
C. IP filtering
D. 802.1X

單項選擇題

Which of the following technologies is used on the backbone of an ISDN?（）

A.VDSL
B.SDSL
C.OC3
D.ATM

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