For each blank, choose the best answer from the four choices and write down on the answer sheet.

（）is a channel’s capacity which directly reflects the data transfer rate of the channel.

（）functions in a NetWare network which is used to define addressing schemes.

（）is a network layer device that supports multiple LAN interfaces and segments LANs into smaller collision and broadcast domains.

（）is the popular LAN developed under the direction of the IEEE802.3.

（）is a device which enables digital microcomputers to communicate across analog telephone lines.

（）is a channel’s capacity which directly reflects the data transfer rate of the channel.

A．The volume

B．The bandwidth

C．The noise

D．The delay

所谓______是指交换机到用户终端之间所有的机线设备。