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全套英文版《计算机网络》电子课件教案-chapter 2 application layer

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《计算机网络与因特网》课件

《计算机网络与因特网》课件
社交媒体：分享信息和交流，建立和维护人际关系
电子商务：在线购物和支付，方便快捷，节省时间和成本
远程教育：在线学资源，实现资源共享和优化配置，提高资源利用率
Part Four
因特网协议
TCP/IP协议族
TCP/IP协议族是因特网的核心协议
包括TCP（传输控制协议）和IP（网际协议）
远程通信：实现远程通信，如电子邮件、即时通讯等
资源共享：实现硬件资源的共享，如打印机、扫描仪等
协同工作：实现多人协同工作，如远程会议、协同编辑等
Part Three
因特网概述
因特网定义
因特网是全球最大的计算机网络，由无数小型网络互联而成
因特网通过TCP/IP协议进行通信，实现全球范围内的信息交换
应用：广泛应用于学术、技术、娱乐等领域
即时通讯（Instant Messaging）
定义：一种实时、双向、点对点的通信方式
特点：快速、便捷、实时、互动性强
应用：QQ、微信、Skype等
影响：改变了人们的沟通方式，提高了工作效率和生活质量
在线游戏（Online Gaming）
游戏类型：包括角色扮演、策略、射击、体育等
TCP负责数据的可靠传输，IP负责数据的路由选择
TCP/IP协议族是开放、免费的协议，广泛应用于因特网
IP地址
IP地址是因特网上每台计算机的唯一标识
IP地址由32位二进制数组成，分为四段，每段8位
IP地址分为A、B、C、D、E五类，其中A、B、C类用于因特网
IP地址分为公网IP和私网IP，公网IP是全球唯一的，私网IP是局域网内的唯一标识
1974年，TCP/IP协议诞生，成为因特网的基础协议
2010年，因特网用户数量超过20亿，成为全球最大的网络系统

计算机网络Chapter_2_V6.2

计算机网络Chapter_2_V6.2
application
process
transport network link physical
socket
application
proபைடு நூலகம்ess
transport network link
controlled by app developer
Internet
controlled by OS
physical

learn about protocols by examining popular application-level protocols
HTTP FTP SMTP / POP3 / IMAP DNS

creating network applications socket API
data integrity some apps (e.g., file transfer, web transactions) require 100% reliable data transfer other apps (e.g., audio) can tolerate some loss timing some apps (e.g., Internet telephony, interactive games) require low delay to be “effective”
Chapter 2 Application Layer
A note on the use of these ppt slides:
We’re making these slides freely available to all (faculty, students, readers). They’re in PowerPoint form so you see the animations; and can add, modify, and delete slides (including this one) and slide content to suit your needs. They obviously represent a lot of work on our part. In return for use, we only ask the following: If you use these slides (e.g., in a class) that you mention their source (after all, we’d like people to use our book!) If you post any slides on a www site, that you note that they are adapted from (or perhaps identical to) our slides, and note our copyright of this material. Thanks and enjoy! JFK/KWR All material copyright 1996-2012 J.F Kurose and K.W. Ross, All Rights Reserved Application Layer 2-1

计算机网络基础知识ppt课件 英文版

计算机网络基础知识ppt课件 英文版

sketch map
Main function: to achieve the communication and resource sharing1． Basic function: data communication Main features: resource sharing
data
Classification: wide area network （WAN）：Tens to thousands of kilometers local area network （ALN） A few meters to a few kilometers metropolitan area network（MAN） （Between WAN and LAN）
1.2
The basis of computertion -- in the form of an electrical signal to the data transmitted from one end to the other end. 2、 The m ai n technol ogy -- "t he maxi m um transmission rate index of data communication" 3、Modulation, demodulation (Modem): converting the data signals and analog signals.
批注本地保存成功开通会员云端永久保存去开通
What is a computer network
? ?
The computer network is the computer system in different geographical location and function of independent by communication lines are interconnected, the system realizes the sharing and communication of cyber source in the network management software

计算机网络英文教材ppt第二章

计算机网络英文教材ppt第二章

Chapter 2 The Physical Layer
30
2.5.3 The Local Loop: Modems, ADSL, and Wireless
Figure 2-23. The use of both analog and digital transmission for a computer to computer call. Conversion is done by the modems and codecs.
3
Chapter 2 The Physical Layer
DTE
DCE
传输介质 DCE
DTE
用户环境
通信系统
Chapter 2 The Physical Layer
用户环境
4
Chapter 2 The Physical Layer
DTE: Equipment that hopes to connect the network. Such as computer, terminal, etc.
2
Chapter 2 The Physical Layer
The definition of physical layer:
the interface between DTE(Data
Terminal Equipment) and
DCE(Data Communications
Equipment)
Chapter 2 The Physical Layer
Chapter 2 The Physical Layer
27
2.5.1 Structure of the Telephone System
(a) Fully-interconnected network. (b) Centralized switch. (c) Two-level hierarchy.

全套英文版《计算机网络》电子课件教案-part i introduction

全套英文版《计算机网络》电子课件教案-part i introduction

Overview: what’s the Internet what’s a protocol? network edge network rmance: loss, delay protocol layers, service models backbones, NAPs, ISPs history ATM network
1: Introduction 7
The network edge:
end systems (hosts):
run application programs e.g., WWW, email at “edge of network”
client/server model
client host requests, receives service from server
protocols define format, order of msgs sent and received among network entities, and actions taken on msg transmission, receipt
1: Introduction 5
What’s a protocol?
router server
local ISP
workstation mobile
regional ISP
company network
1: Introduction 3
What’s the Internet: a service view
communication
infrastructure enables
Internet: “network of
networks”
loosely hierarchical

计算机网络 Chapter_2_V7.01 PPT精品课件

计算机网络 Chapter_2_V7.01 PPT精品课件
conceptual, implementation aspects of network application protocols
• transport-layer service models
• client-server paradigm
• peer-to-peer paradigm
• content distribution networks
Application Layer 2-3
Some network apps
e-mail
web
text messaging
remote login
P2P file sharing
multi-user network games
streaming stored video (YouTube, Hulu, Netflix)
message syntax:
• what fields in messages & how fields are delineated
message semantics
• meaning of information in fields
rules for when and how processes send & respond to messages
peers are intermittently connected and change IP addresses
• complex management
peer-peer
Application Layer 2-8
Processes communicating
process: program running within a host

计算机网络基础知识课件英文版

Introduction to Computer Networks
Discover the world of computer networks, from their definition and significance to their classification and protocols. Explore the fascinating concepts of OSI and TCP/IP models, network topologies, devices, security, performance optimization, applications, and management.
Network Performance Optimization
Data Transmission Rate
Learn about factors that influence transmission speeds, such as bandwidth, latency, and throughput.
Star
A network topology where devices are connected to a central hub or switch.
Ring
A network topology where devices are connected in a circular manner, forming a
Reducing Latency
Discover techniques to minimize latency, ensuring faster response times and smoother network performance.
Increasing Bandwidth

2024版《计算机网络基础》完整版课件全书电子教案pdf

TCP的可靠传输机制
通过确认应答、超时重传、流量控制等机制 实现。
26
UDP协议
UDP协议的特点
无连接、不可靠传输、基于数据报。
UDP的适用场景
适用于实时性要求高、可容忍少量丢包的应 用，如音视频通话、实时游戏等。
UDP的报文格式
UDP的传输效率
包括源端口号、目的端口号、长度和校验和 等字段。
由于没有TCP的确认应答等机制，UDP的传 输效率相对较高。
将网络的通信过程划分为小一些、简 单一些的部件，有助于各个部件的开 发、设计和故障排除。
2024/1/29
8
OSI七层模型
物理层
负责传输比特流，提供为建立、 维护和拆除物理链路所需要的机 械的、电气的、功能的和规程的
特性。
2024/1/29
数据链路层
负责将比特组合成字节，再将字节 组合成帧，使用链路层地址（以太 网使用MAC地址）来访问介质， 并进行差错检测。
应用层
为操作系统或网络应用程序提供访问网络服务的 接口。
10
TCP/IP四层模型
对应于OSI的网络层，负责将网 络地址翻译成对应的物理地址， 并决定如何将数据从发送方路由 到接收方。
对应于OSI的会话层、表示层和 应用层三层，为操作系统或网络 应用程序提供访问网络服务的接 口。
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网络接口层 网络层 传输层 应用层
2024/1/29
CIDR技术
无类别域间路由，实现IP地址的聚合和路由 的简化。
22
路由选择算法与路由协议
路由选择算法
静态路由选择算法和动态路由选择算 法，根据网络拓扑和流量变化进行路 由选择。
路由协议
RIP、OSPF、BGP等，用于路由器之 间交换路由信息，建立和维护路由表。

计算机网络专业外语PPT


What is
the Computer Network Technically, Network is defined as "If at least one process in one computer is able to send/receive data to/from at least one process residing in a remote computer, then the two computers are said to be in network".
The Applications(应用 应用) 应用
A usenet newsgroup（新闻组） is
a repository usually within the Usenet system, for messages posted from many users in different locations. The term may be confusing to some, because it is usually a discussion group. Newsgroups are technically distinct from, but functionally similar to, discussion forums on the World Wide Web. News reader software is used to read newsgroups.
The Applications(应用 应用) 应用
---Video conferencing
The Applications(应用 应用) 应用
Voice over IP (VoIP网络电话) is a family of

计算机网络与技术(双语)课程计算机网络教学大纲(双语)

《Computer Network》课程教学大纲二、课堂教学时数及课后作业题数分配三、单元教学目的、教学重难点和内容设置L1 Course Preparation【teaching objective】to help students know Sentence analyzing of the scientific English and some terms of the computer and communication technology.【keys and difficulties 】Long Sentence analyzing and terms memorizingL2 Introduction of the computer networks【teaching objective】to help students know the basic knowledge of network applications and Communication media, local asynchronous communication and long distance communication. 【keys and difficulties 】understanding the concept and principal of local asynchronous communication and long distance communication.L3 Packet transmission 1【teaching objective】to help students know the basic concept of transmission errors and error detection , LAN topologies, Addressing principal.【keys and difficulties 】understanding the concept of error detection the method to avoid transmission error.L4 Packet transmission 2【teaching objective】to help students know the basic concept fiber modems, repeater, bridges switches ATM technology and W AN technology, to understand the principal of the loop digital technology and Routing ,【keys and difficulties 】understanding the Routing principal and applications of WANL5 Packet transmission 3【teaching objective】to help students know network Characteristics, to understand the relation of the seven layers【keys and difficulties 】understanding the sketch of Information transmission among layers.L6 Internetworking1【teaching objective】to help students know network concepts architecture and protocols, and understand the address resolution.【keys and difficulties 】understanding the principal and work mechanism of ARP protocol.L7 Internetworking2【teaching objective】to help students know concepts of IP datagram, datagram forwarding, IP encapsulation, fragmentation and reassembly, and understand the mechanism of error reporting. 【keys and difficulties 】understanding the principal and work mechanism of error reporting and correcting.L8 Internetworking3【teaching objective】to help students know how to guarantee the reliable transport service andunderstand the mechanism of the address translation and internet routing.【keys and difficulties 】understanding t he mechanism of the address translation and internet routing.L9 and L10 work Application1【teaching objective】to help students know some applications of the computer networks and improve scientific English reading ability.【keys and difficulties 】understanding the concept and use of Computer security。

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application transport network data link physical
application transport network data link physical
2: Application Layer 2
Network applications: some jargon
socket: Internet API
two processes communicate by sending data into socket, reading data out of socket
Q: how does a process “identify” the other process with which it wants to communicate?
Application: communicating, distributed processes
running in network hosts in “user space”
exchange messages to implement app
e.g., email, file transfer, the Web
Bandwidth
some apps (e.g., multimedia) require minimum amount of bandwidth to be “effective”
Application-layer protocols
one “piece” of an app
define messages exchanged by apps and actions taken
user services provided by lower layer protocols
application transport network data link physical
2: Application Layer 5
What transport service does an app need?
Data loss
some apps (e.g., audio) can tolerate some loss
other apps (e.g., file transfer, telnet) require 100% reliable data transfer
Processes running in different hosts communicate with an application-layer protocol
A user agent is an interface between the user and the network application.
Chapter 2: Application Layer
Chapter goals:
conceptual + implementation aspects of network ation protocols
client server paradigm
service models
learn about protocols by examining popular application-level protocols
Server:
provides requested service to client
reply
application transport network data link physical
e.g., Web server sends requested Web page, mail server delivers e-mail
More chapter goals specific protocols:
http ftp smtp pop dns
programming network applications
socket programming
2: Application Layer 1
Applications and application-layer protocols
Web:browser
E-mail: mail reader
streaming audio/video: media player
2: Application Layer 3
Client-server paradigm
Typical network app has two
pieces: client and server
A process is a program that is running within a host.
Within the same host, two processes communicate with interprocess communication defined by the OS.
2: Application Layer 4
Application-layer protocols (cont).
API: application programming interface
defines interface between application and transport layer
Client: initiates contact with server
(“speaks first”)
application transport network data link physical
request
typically requests service from server,
for Web, client is implemented in browser; for e-mail, in mail reader
IP address of host running other process
“port number” - allows receiving host to determine to which local process the message should be delivered
… lots more on this later.