The OSI (68) model，sometimes also called ISO or 7 layers reference model for communication.has been developed by the International Standards Organization in early 1980's.(68)

A．referent

B．reference

C．referance

D．refering

[单选题]The OSI(66)model, sometimes also called ISO or 7 layers reference model for communication, has been developed by the International Standards Organization in early 1980's.A．referentB．referenceC．referanceD．refering

[单选题]The OS！( ) model， sometimes also called ISO or 7 layers reference model for

[单选题] OSI is a theoretical model that shows how any two different systems can communicate with each other．Router, as a networking device, operate at the (71) layer of the OSI model．(71)A．transportB．applicationC．networkD．physical

Extra _____ is sometimes also shown to widows and the retired.Extra_____issometi

[单选题]OSI is a theoretical model that shows how any two different systems can communicate with each other. Router, as a networking device, operate at the ______ layer of the OSI model.A．transportB．applicationC．networkD．physical

[单选题]A．t which layer of the OSI model does the protocol that provides the information displayed by the "show cdp neighbors" command operate?A．TransportB．PhysicalC．ApplicationD．Data linkE．Network

They can also be made of plastic, animal bone or metal. Sometimes chopsticks are

[名词解释] 模型（Model）

[单选题]The spiral model is a software development model combining elements of both

concentriate:In the United States, but also believed that it is the United State