[信息与通信]第02章 OSI和TCPIP——new 2.ppt
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1、Chapter 2 OSI Model & TCP/IP Protocol Suite,The OSI/RM Layers in the OSI/RM TCP/IP protocol suite Addressing in TCP/IP TCP/IP versions,2.1 The OSI/RM,An ISO standard Open System Interconnection/ Reference Model 开放系统互连/参考模型 Released in 1984 Ensured greater compatibility and interoperability 7 layers,
2、 each of which illustrates a particular network function,ISO is the organization, OSI is the model,OSI is not a protocol, but a conceptual model,OSI Model,Application,Presentation,Session,Transport,Network,Data Link,Physical,7,6,5,4,3,2,1,应用层,表示层,会话层,传输层,网络层,数据链路层,物理层,网络支持层 (软/硬件),应用支持层 (软件),Why Lay
3、ered?,Advantages Reduces complexity Standardizes interfaces Facilitates modular engineering Ensures interoperable technology Accelerates evolution Simplifies teaching and learning Disadvantages Strict layered architecture makes its software not so efficient.,N+1,N,N-1,The Features of Layering,Each l
4、ayer concerns on its own details Each layer provides a service to the layer above Each layer communicates with its peer layer in another node through the use of a corresponding protocol,Peer-to-Peer Communication,Interface 接口,Service 服务,Peer Layer vs. Peer Entity,Multiple entities in one layer Peer
5、entity:存在通信关系的对等层实体 Multiple protocols in one layer Protocol:对等实体间的通信规则,CutFTP,FTP Server,Outlook,Mail Server,IE,WWW Server,Layer 7,Layer 7,Outlook,IE,CutFTP,FTP Server,Mail Server,WWW Server,FTP,HTTP,SMTP,Data Exchange: Encapsulation,Source,Destination,A,P,S,T,N,DL,Ph,PDU:Protocol Data Unit 协议数据单元,
6、帧 Frame,分组 Packet,数据段 Segment,数据 Data,Postal Delivery,同层间需要约定规则协议,2.2 Layers in the OSI/RM,Application,Presentation,Session,Transport,Network,Data Link,Physical,7,6,5,4,3,2,1,Network processes to applications,Data representation,Inter-host communication,End-to-end connections,Addressing and best pat
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