题目内容：
根据下列题干，回答题For each blank, choose the best answer from the four choices and write down on the answer sheet.
(1)is a channel's capacity which directly reflects the data transfer rate of the channel.
(2)functions in a NetWare network which is used to define addressing schemes.
(3)is a network layer device that supports multiple LAN interfaces and segments LANs into smaller collision and broadcast domains.
(4)is the popular LAN developed under the direction of the IEEE802.3.
(5)is a device which enables digital microcomputers to communicate across analog telephone lines.
请选择（1）处最佳答案
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答案解析：