为了降低网络设计的复杂性,绝大多数网络都组织成一堆相互叠加的层(layer),每一层都建立在其下一层的基础之上。协议(protocol)是指通信双方关于如何进行通信的一种约定。在每一对相邻层之间的是接口(interface),接口定义了下层向上层提供哪些原语操作和服务。层和协议的集合称为网络体系结构(network architecture)。
slide S1 - session layer jargon Purpose of the session layer The purpose of the session layer is to provide the means necessary for co-operating presentation entities to organise and synchronise their dialogue and to manage their data exchange. To do this, the session layer provides services to ...
一、OSI七层协议模型 OSI的七层协议主要包括:物理层(physical layer)、数据链路层(data link layer)、网络层(network layer)、运输层(transport layer)、会话层(session layer)、表示层(presentation layer)、应用层(application layer)。二、TCP/IP四层协议模型 ...猜...
This layer can be termed as an end-to-end layer as it provides a point-to-point connection between source and destination to deliver the data reliably. The two protocols used in this layer are: Transmission Control Protocol It is a standard protocol that allows the systems to communicate over...
Application layer protocols At the application layer, users encounter a list of protocols. They contain syntax rules for specifying how data transfers between networks. The primary goal is to provide meaningful information to end users. HTTP, SMTP, FTP, POP, and DNS are all essential protocols of...
Transition: The next section discusses the network layer of the OSI model and how it corresponds to the TCP/IP internet layer. * * * * * * Purpose: This figure presents a list of the protocols operating at the Internet layer. Emphasize: Review the protocols briefly. They are covered in ...
Layer 3: Network - The way that the data will be sent to the recipient device is determined in this layer. Logical protocols, routing and addressing are handled here. Layer 2: Data - In this layer, the appropriate physical protocol is assigned to the data. Also, the type of network and...
(FTAM) protocol was implemented on top of Association Control Service Element(ACSE) and the Presentation layer ona VAX/VMS system.This paper describes the experience with the implementation of the system dependent componentsasynchronous modules used to implement FTAM, ACSE and the Presentation protocols...
Network layer protocols All the connections, addressing, routing, and error control processes are implemented at layer 3 using various protocols. IP (Internet Protocol) andICMP (Internet Control Message Protocol)are two of the most widely-used protocols at the network layer. ...
The OSI model provides an extensive list of functions and services that can occur at each layer. It also describes the interaction of each layer with the layers directly above and below it. Comparison of TCP/IP and OSI models The protocols that are discussed in the TCP/IP model, can be ...