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计算机网络基础知识ppt课件 英文版


What is a computer network

?? ?

The computer network is the computer system in different geographical location and function of independent by communication lines are in

terconnected, the system realizes the sharing and communication of cyber source in the network management software

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 computer communication

1、Data communication -- 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.

4、Baseband and broadband transmission Baseband transmission (BAB): the original form of the signal into the line. Broadband transmission (BRB): converting the data signal in the computer for analog signal transmission

5、mode of data transmission ?Parallel communication

?Serial communication

1.2.2Computer network system and network protocol 1, Network protocol: must follow the stipulated in the communication process. 2、Network system is generally divided into seven layers: ?The physical layer ?Data link layer ?The network layer ?Transport layer ?The session 会话layer ?The presentation layer ?Application layer

1.2.3Computer network operating system ?Single operation ?Network management 1.2.4 network devices S e r v e r, w o r k s t a t i o n , n e t w o r k c a r d , m o d e m , communication lines, communication equipment.

Dual function of the software

modem

network card

INTERNET与

modem

1.3 Computer LAN
1.3.1Characteristics ?Small range ?The transmission rate is generally megabits per second (Mbps) (ten to 100 million)

?Transmission medium using twisted pair, coaxial cable, optical cable
?Extensive use of bus type, star type structure, supports both point-to-point communication and multipoint communication. ?Easy installation, maintenance, high reliability. ?Easy to learn

INTERNET与

1.3 Computer local area network
hardware system 一、Composition: software system

1、 hardware system

?The server (using high-grade machine, rich shared resources) ?The workstation (personal computer) ?NIC (network adapter) ?Lines of communication ?communication device

网络1

server

sketch map of LAN

?Novell network (operating system (OS):Netware) 2、 software system ?Windows NT (operating system (OS):Windows NT Server)

1.4INTENRET

?Multiple LANs interconnected became a global internet. The Internet is mainly to solve the problem of different network protocols, in order to make the computer network of different types can be connected.

Internet

网络1 networ k1

router

networ k2

网络1

?Internet hardware:

Repeater (amplifying signal function, used to connect the long line)

Bridge (connecting two similar network, expanding the number of users in the network) Router (bridge, the network and the network connection data -- the source host -- multiple routers -- the destination host)

gateway (online different types of different network protocols)

1. What is Internet Internet is a global, the most influential, the most abundant information resources in the internet

1.4.3 Internet language——TCP/IP TCP\/IP is a set of protocols. It is the communication between Internet computer must be a common communication rules

3、File Transfer Protocol(FTP) FTP is one of the traditional service. FTP allows users to transfer files between two computers on the internet


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