is the 4th layer of the OSI reference model responsible for reliable network communication between end nodes.

A．Data link layer

B．Session layer

C．Transport layer

D．Application layer

[单选题]A．ccording to the 4th paragraph, a great many poor people in American cities.A． are faced with housing problemsB． are forced to move to the suburbsC． want to sell their buildingsD． need more money for daily expenses

[单选题]The 4th paragraph suggests thatA． questions are often put to the more intelligent students.B． alphabetically disadvantaged students often escape form. class.C． teachers should pay attention to all of their students.D． students should be seated accord

[单选题]What does the underlined word "dodge" in 4th paragraph probably mean?A.Avoi

[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

[单选题]Which OSI layer does a Router operate at?A．the Physical LayerB．the Data Link LayerC．the Transfer LayerD．the Network Layer

[单选题]Which OSI layer does a bridge operate at?A．the Physical LayerB．the Network LayerC．the Transport LayerD．the Data Link Layer

[单选题]is a six bytes OSI layer 2 address which is burned into every networking device that provides its unique identity for point to point communication。A．The virtual addressB．The subnet addressC．The MAC addressD．The IP address

计算机网络的体系结构就是指计算机网络的各层及其协议的集合，或计算机网络及其部件所应完成的功能。计算机网络的体系结构存在的目的就是使不同计算机厂家的计算机能够相互通信，以便在更大的范围内建立计算机网络。　　国际标准化组织ISO于1983年正式提出了一个七层模型，叫做开放式系统互联模型（通称ISO/OSI）。[1]OSI模型将整个网络通信的功能划分为7个层次，由底层到高层分别是物理层、链路层、网络层、传输层、会话层、表示层和应用层。每层完成一定的功能，都直接为其上层提供服务，并且所有层次都互相支持。第4层到第

[单选题]Three concepts are central to the OSI model: Service, Interface andA．LayersB．applicationsC．ProtocolsD．Networks

[单选题]( ) is a six bytes OSI layer 2 address which is burned into every networkin