单项选择题

A computer is connected to the network through a NIC， which has a unique assignment that is called the Ethernet MAC address. Which layer of the OSI model does the MAC address use to communicate with the network？（）

A. network
B. application
C. session
D. data link

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多项选择题

A. PAT
B. CAT
C. NAT
D. DAT
E. FAT

多项选择题

A. passive optical network （PON）
B. serial
C. Fibre Channel
D. Fast Ethernet
E. ADSL2+