计算机网络(小抄版)(国外英文资料).docVIP

计算机网络(小抄版)(国外英文资料) The first chapter is introduction The simplest definition of a computer network is a collection of interconnected, autonomous computers. The definitions of a computer network is the computer network: refers to the number of units in different locations and with independent function by computer, communication equipment and lines connected to each other, in a computer system to realize data transmission and resource sharing. The irregular type structure of the computer network according to the topology structure is divided into a star shaped structure, hierarchy or tree structure, bus type structure, ring structure, point point, point point interconnection structure part connection (network structure) six The third chapter is the architecture of computer network Network architecture definition: in order to complete the cooperative communication between computers, each computer interconnection functions divided into clearly defined levels, and the provisions of the same level between the communication process and the agreement of the adjacent layer interface and service. The protocol of communication between the same layer and the interface of the adjacent layer are collectively referred to as network architecture. Network protocol three elements: syntax, semantics, synchronization. OSI reference model: physical layer, data link layer, network layer, transport layer, session layer, presentation layer, application layer, respectively: The task of the physical layer is to transparently transport bit streams over the communication channel. The main task of data link layer is to strengthen the physical layer to transfer the function of the original bit, so that it can appear as an error free line to the network layer. The main function of the network layer is to complete the data transfer between any hosts in the network, and the key problem is how to route packets from the source host to the destination host. The basic function of the transport layer is