X.25是CCITT关于分组交换网络的通信协议,其内容包括OSI参考模型(61);分组在X.25网中的传输方式,不含(62);两个X.25公用分组网之间互连时,采用的互连协议为(63);公用分组交换网的地址(编号)根据X.121建议编制,该地址中表示国别的部分有(64)十进制数:PAD的主要功有是(65)。
(73)
(72)
(71)
(70)
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.
(68)
(67)
(66)
In the following essay, each blank has four choices. Choose the most suitable one from the four choices and write down in the answer sheet. Heterogeneous network environments consist of computer systems from(66)vendors that run(67)operating systems and communication protocols. An organization that(68)its computer resources is usually(69)the task of integrating its heterogeneous systems. Typically, each deparlment or division has defined its own network needs(70)OS, LAN topology, communication protocols, applications, and other components.
(65)
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