Network architecture

concept

network architecture: a collection of computer networks and protocols at all levels. Its hierarchy generally vertical hierarchical model to represent.

Introduction

usually in the network layer level or organized manner, each layer built on top of its lower layer. Different networks, layer name, quantity, content and functionality are different. But the purpose of each layer is a layer to provide its services, it is the same. A set of layers and protocols is called a network architecture. As a specific network architecture, important current and widely-used network structure there OSI architecture and TCP / IP architecture.

OSI is Open Systems Interconnection Basic Reference Model of OSI / RM (Open System Interconnection ReferenceModel) abbreviation, it is divided into seven layers, which seven different levels are defined functions. Almost all of the network model are based on this architecture and the improved definition, these levels are from top to bottom is the application layer, presentation layer, session layer, transport layer, network layer, data link layer and the physical layer, wherein the physical layer is positioned lowest level architecture, which defines the physical and electrical properties OSI network.

OSI is an acronym for Open System Interconnect, which means Open Systems Interconnection. ISO (International Organization for Standardization) developed the OSI model. The working model of the communication network into seven layers are the physical layer, data link layer, network layer, transport layer, session layer, presentation layer and application layer.

TCP / IP (Transmission Control Protocol / Internet Protocol, Transmission Control Protocol and Internet Protocol) Abbreviation, TCP / IP architecture is currently applied to the Internet Architecture network, it is by OSI architecture evolution to it is not the presentation layer, only the application layer, transport layer, Internet layer and network interface layer.