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After replacing the NIC card of a PC on the LAN, your Cisco switch shows a new MAC address is attached to that port. Which of the following answer choices below correctly describe a MAC address?（）

A. It is a globally unique IP address.
B. It is a globally unique 48 bit address
C. It is provided by the manufacturer of the NIC.
D. It is used as part of the IPX/SPX configuration.
E. It is a logical address.

多項選擇題

Which of the following correctly describe the various functions and virtues of a router?（）

A. Packet switching
B. Collision prevention on a LAN segment.
C. Packet filtering
D. Broadcast domain enlargement
E. Broadcast forwarding
F. Internetwork communication