计算机网络设计Computer Networks Design
Abstract
Through the structural wiring method, can be connected togethere multiple hub,forming a large-scale LAN, the LAN most used mixed topology,and tree and star in the majority.Each floor we use one router and the five routers connect with a switch.
Structured cabling system is the building or buildings within the transmission network both make the data communications equipment, switching equipment, and other information management systems connect to each other, but also enable these devices interconnected with the external communications network, including building to the external the network line connection point, and work area of all cables between the data terminal, and associated wiring components. A good structured cabling system equipment for its services, a certain independence, and can interconnect a number of different communications devices, such as dataterminals, PC and the host, and public installations.
Key words: WAN LAN network router
PartⅠ Learn form this semester
This term,we studied for four parts of computer networks and internets, incluing:
•Network Applications and Network Programming
•Data communications
•Packet Switching and Networking technologies
•Internetworking with TCP/IP
Chapter1 Network Applications and Network Programming summary
In the Internet,all services are supplied by applications,which use either a stream paradigm or a message paradigm to communicate.The stream paradigm guarantees to deliver a sequence of bytes in order, but can choose how many bytes to pass to a receiver in each batch. The ,message paradigm preserves boundaries,but allows messages to be lost,duplicated, or delivered out-of-order.
The basic communication model used by network applications is known as the client-server model. A program that passively waits for contact is called a server,and a program that actively initiates contact with a server is called a client.
Each computer is assigned a unique address,and each service, such as email or web access,is assigned a unique identifier known as a protocol port number.When a server starts, it specifies a protocol port number; when contacting a server,a client specifies the address of the computer on which the server runs as well as the protocol port number the server is using.
A single client can access more than one service,a client can access servers on multiple machines,and a server for one service can become a client for other services.Designers and programmers must be careful to avoid circular dependencies among servers.
An Application Program Interface(API) specifies the details of how an application program interacts with protocol software.Although details depend on the operating system,the socket API is a de facto standard.A program creates a socket, and theninvokes a series of functions to use the socket.A server using the stream paradigm calls socket functions: socket, bind, listen, accept, recv,send,and close: a client calls socket, connect, send , recv, and close
Chapter 2 Data communications summary
2.1 The conceptual pieces of a communication system
To understand data communications,imagine a working communicatio
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