For each blank, choose the best answer from the four choices and write down on the answer sheet. (71)is a channel' s capacity which directly reflects the data transfer rate of the channel. (72)functions in a NetWare network which is used to define addressing schemes. (73)is a network layer device that supports multiple LAN interfaces and segments LANs into smaller collision and broadcast domains. (74)is the popular LAN developed under the direction of the IEEE802.3. (75)is a device which enables digital microcomputers to communicate across analog telephone lines.